Archivo Digital UPM: No conditions. Results ordered -Date Deposited. 2022-01-29T02:21:39ZEPrintshttps://oa.upm.es/style/images/logo-archivo-digital.pnghttps://oa.upm.es/2022-01-12T12:48:42Z2022-01-12T12:48:42Zhttps://oa.upm.es/id/eprint/64951This item is in the repository with the URL: https://oa.upm.es/id/eprint/649512022-01-12T12:48:42ZNonlinear stability analysis of a generic fan with distorted inflow using passage-spectral methodThe dependence of the aerodynamic stability of fan blades with the nodal diameter and amplitude of the inlet perturbations is studied. The analysis is conducted using a block-wise spatial Fourier decomposition of reduced-passages to reconstruct the full-annulus solution. The method represents very efficiently the unsteady flow generated by inlet non-uniformities. The explicit spatial Fourier approximation is exploited to characterize the relevance of each nodal diameter of the inlet perturbation in the fan stall process and study the nonlinear stability in a harmonic by harmonic basis. This approximation allows studying the contribution to stall of each circumferential mode separately. The methodology has been assessed for the NASA rotor 67. The maximum amplitude of total pressure distortion at which the compressor becomes unstable and triggers a stall process has been mapped. It has been proven that despite the complexity of a screen-induced total pressure distortion the only relevant parameter for the nonlinear stability of the fan is the most unstable nodal diameter. The equivalence in terms of stability between realistic distortion screens and single harmonic distortions has been assessed. Full-annulus simulations have been conducted to assess the accuracy of the simplified nonlinear stability limit. It is concluded that performing a nonlinear simulation with the proper single harmonic perturbation is enough to assess fan stability. The total pressure error with respect the full annulus simulation including a screen-induced pressure deficit at the intake is below 10%. It is shown that for the NASA rotor 67 running at the nominal speed the most unstable nodal diameter is the first. This study not only shows a reduction in computational time to assess nonlinear fan stability by a factor of seven but also creates an efficient methodology for understanding the nonlinear instability of fans due to inlet distortion profiles.David Romera HijanoRoque Corral Garcia2022-01-12T08:51:36Z2022-01-12T08:51:36Zhttps://oa.upm.es/id/eprint/67880This item is in the repository with the URL: https://oa.upm.es/id/eprint/678802022-01-12T08:51:36ZA statistical model from information theory to explain Zipf's law of abbreviationBrevity and frequency are two crucial factors in the processes of statistical learning in language. The compression principle had already been used previously to explain the origin of Zipf’s law for the frequency of words. Here we use a model from information theory to also explain the Zipf’s law of abbreviation, or the statistical tendency of more frequent elements in language to be shorter (in characters in the case of written language, and in time durations for oral communication). As far as we know, we show for the first time that Zipf’s law of abbreviation is a global speech process that holds in words regardless of what are the linguistics units of study. In addition, the derived model from information theory allows us to fit empirically linguistic data in English (Buckeye Corpus), considering both acoustic elements (phonemes and words) and its transcripts. This raises that the processes measured in units of written text are a byproduct of spontaneous speech patterns. The more a word is used, the greatest effort in compression that will make it shorter; but also the shorter it is, the more times it will be used statistically. This work paves the way for new experimental approaches to the study of statistical learning in human language and other communication systems.Antoni Hernández-FernándezIván González TorresLucas LacasaChristopher T. KelloBartolome Luque Serrano2021-12-20T10:02:25Z2021-12-20T10:03:10Zhttps://oa.upm.es/id/eprint/67801This item is in the repository with the URL: https://oa.upm.es/id/eprint/678012021-12-20T10:02:25ZMultiple scale analysis of the forced response of a mistuned bladed disk with nonlinear friction forcesThe unavoidable small blade-to-blade variations in a turbomachinery bladed disk are know as "mistuning". When compared with the ideal, "tuned", bladed-disk, the mistuning can produce a considerable increase of the vibratory forced response level of the blades. This situation can lead to high cycle fatigue failure, and, therefore, the correct estimation of the vibratory response is of crucial importance for the prediction of the operative life span of the bladed disk. The computation of the final amplitude of the limit cycle oscillation requires to solve a quite complicated problem; the mistuned bladed disk is not cyclic symmetric, and, consequently, the complete bladed disk has to be considered, increasing dramatically the computational cost of the numerical simulations. For this reason we discuss the possibility of applying an asymptotic multiple scale analysis to derive a simplified model that can be used to analyze the characteristics of the final vibration states at a much lower computational cost. The key idea for the simplification is the fact that all significant effects present (forcing, nonlinear friction damping, and mistuning) are, in most practical situations, small effects, that develop in a time scale that is much longer than that associated with the natural elastic vibration frequency of the tuned system. In this paper the bladed disk is described using a mass-spring system with nonlinear friction, and we consider the frequent case of forcing a blade dominated modal family, where all modes have very similar vibration frequencies. The derivation of the asymptotically simplified model is explained in detail, and the validity of its results is verified against the results from the original mass-spring model, for both tuned and mistuned configurations.Juan Angel Martin BautistaCarlos Martel Escobar2021-12-16T13:02:19Z2021-12-16T13:02:38Zhttps://oa.upm.es/id/eprint/67197This item is in the repository with the URL: https://oa.upm.es/id/eprint/671972021-12-16T13:02:19ZStudy of bubble growth in a multicomponent mixture at high pressureIn this work the bubble growth in a multicomponent mixture at high pressure is analysed. This study is highly relevant, as it is representative of the change of phase of petroleum in reservoirs. A physical model based in the Navier-Stokes equations complemented by appropriate boundary conditions at the interface between the gas and the liquid phases is presented. The introduced model assumes spherical symmetry to alleviate the computational cost of solving the problem. This computational cost is further reduced by introducing several approximations, which reduce the model to a system of three ordinary differential equations, two parabolic problems and a chemical equilibrium computation. Numerical solutions of this model for a simple mixture are presented.Aitor Amatriain CarballoIgnacio E. Parra FabianGonzalo Rubio Calzado2021-12-14T12:48:11Z2021-12-14T12:48:32Zhttps://oa.upm.es/id/eprint/57641This item is in the repository with the URL: https://oa.upm.es/id/eprint/576412021-12-14T12:48:11ZEfficient passage-spectral method for unsteady flows under stall conditionsThis paper presents an efficient method of approximating unsteady flows using a blockwise discrete spatial Fourier series for the modeling of three-dimensional non-axisymmetric flows without making any hypothesis about its temporal periodicity. The method aims at capturing the long wavelength flow patterns which are present in many unsteady problems of industrial interest, such as compressor stability, with a drastic reduction in computational resources. The method is intended to be used to compute flows exhibiting large-scale instabilities and where the fundamental frequency of the problem is not known beforehand. The approach discretizes the domain using a finite number of blocks or passages, where the flow variables at the supposedly periodic boundaries are continuously updated using the spatial Fourier coefficients of a uniformly spaced set of reduced-passage domains. The NASA rotor 67 under stall conditions has been used as verification validation case to demonstrate the effectiveness and viability of the proposed modeling strategy. The comparison between the solutions obtained with the discrete Fourier series and the full-annulus solution shows that accurate solutions can be obtained with a low number of harmonics. The new method has been applied to investigate the rotating stall inception of the NASA rotor 67 for clean and distorted inlet flow near stall operating conditions. The method is shown to accurately reproduce the full-annulus solution with a few spatial harmonics, capturing the characteristic features of the complex flow induced by the tip leakage vortex breakdown. The computational cost in this application has been reduced by a factor of between three and seven, although this number heavily depends on the ratio between the number of retained harmonics and the number of blades.David Romera HijanoRoque Corral Garcia2021-11-19T12:05:08Z2021-11-19T12:05:08Zhttps://oa.upm.es/id/eprint/67881This item is in the repository with the URL: https://oa.upm.es/id/eprint/678812021-11-19T12:05:08ZLog-normal distribution in acoustic linguistic unitsAfter a previous study on linguistic laws at the pre-phonemic level, in this work we verify with accuracy that acoustically transcribed durations of linguistic units at several scales (phonemes, words and Breath Groups) comply with log-normaldistribution. To do this we have used a well-known Corpus (Buckeye Corpus) which contains conversational speech by native American English speakers gathering approximately 3·105 words with time-aligned phonetic labels. We explain this Log-normal distributions using a new model: a Non-interacting Cascade Approach (NICA) model. This model can explain the emergence of Lognormal distributions across linguistic levels (words, Breathe Groups) solely based on the assumption that phoneme durations are also Lognormal. We find an extremely good quantitative agreement between NICA and the experimental data for the case of phonemes and words, and also for BG after adding a Gaussian term in order to solve issues of segmentation and phenomena such as Voice Onset Time (VOT). Finally, we discuss our results and justify our recommendation to work with medians instead of mean values (which assumes Gaussian distribution) to avoid biases and erroneous conclusions in statistical learning studies based on acoustic elements with long-tailed distributions.Ivan Gonzalez TorreLucas LacasaChristopher T. KelloBartolomé Luque SerranoAntoni Hernández-Fernández2021-11-16T07:10:38Z2021-11-16T07:10:38Zhttps://oa.upm.es/id/eprint/67222This item is in the repository with the URL: https://oa.upm.es/id/eprint/672222021-11-16T07:10:38ZIndustrial benchmark simulations of detached flows using XFlowWe present simulations of turbulent detached flows using the commercial lattice-Boltzmann solver, XFlow. Using traditional Computation Fluid Dynamics (CFD) software, industrial problems require time consuming meshing processes. Due to its particle-based methodology, the meshing complexity is reduced in XFlow, allowing to solve complex geometries easily using octree structures. However, this ease for meshing rises the question of accuracy to compute detached flows. The performance of XFlow will be demonstrated for different industrial benchmarks and compared to experimental data. We select four industrial cases: first, the Goldschmied Body10 at Re= 8.9 ·104 . Second, the HLWP-2 (2nd High-Lift Prediction Workshop)19 geometry, which represents a full aircraft at Re= 1.35 · 106 and Re= 15.1 · 106 . Third, a dynamic stall for a NACA001215 at Re= 0.98 · 106 for a reduced frequency, k = 0.1. Finally, a parametric study to improve wing stall using tubercles located at the leading edge at Re/L = 4.66 · 106 with a reference length, L.Miguel Chavez-ModenaEsteban Ferrer VaccarezzaJose Luis MartinezJose Alberto Cabello2021-10-14T08:02:28Z2021-10-14T08:02:28Zhttps://oa.upm.es/id/eprint/67230This item is in the repository with the URL: https://oa.upm.es/id/eprint/672302021-10-14T08:02:28ZThe thermocapillary effects in phase change materials in microgravity experimentBy their nature, Phase Change Materials (PCMs) store and
release a large amount of energy during phase change,
feature that may be put in good use to maintain a system
temperature within admissible limits. Such large storage
capacity, combined with the thermal stability shown around
the melting point, has motivated many industrial
applications on ground (Memon, 2014). Space systems,
whose operating environment generally results in thermal
cycles, have also used PCMs for thermal regulation.
Examples of both low and high temperature control systems
range from complex engineering applications to daily needs
in manned mission (Kim et al. 2013).Pablo Salgado SanchezJose Miguel Ezquerro NavarroAlvaro Bello GarciaJose Javier Fernandez FraileJacobo Rodriguez OteroIgnacio Tinao Perez-Miravete2021-10-07T09:23:05Z2021-10-07T09:23:05Zhttps://oa.upm.es/id/eprint/67838This item is in the repository with the URL: https://oa.upm.es/id/eprint/678382021-10-07T09:23:05ZAn application of HODMD to predict flutter using NeoCASSWe present a method based on higher order dynamic mode decomposition (HODMD) to predict aeroelas-tic modes in signals representing fluid-structure interactions. For such aim, some data are generated using an open source solver called NeoCASS (Next generation Conceptual Aero-Structural Sizing Suite), which reproduces real flight test conditions. Symmetric and anti-symmetric aeroelastic modes have been excited in two different numerical experiments. The HODMD-based method is able to detect the frequencies, damping rates and modal shapes of the leading aeroelastic modes with high accuracy. The good performance of this method provides a new and efficient tool, which can be extended to predict flutter in flight test in real time.Carlos MéndezSoledad Le Clainche MartinezRubén Moreno-RamosJosé M. Vega de Prada2021-06-10T08:48:20Z2021-06-10T08:48:20Zhttps://oa.upm.es/id/eprint/57741This item is in the repository with the URL: https://oa.upm.es/id/eprint/577412021-06-10T08:48:20ZIceANS tool: Ice Accretion Numerical Simulation : Code DescriptionThe adverse effects of ice accretion in aerodynamic surfaces are widely known and thus, the aerospace industry is working on different approaches to predict the behaviour of the water-ice interface on these surfaces. In this context, the software IceANS (Ice Accretion Numerical Simulation) calculates the amount of water collected by a surface immersed in a fluid flow using a Lagrangian approach, that is, simulating the motion of a huge group of droplets and detecting the impact points in the surface. The nature of the problem favours the use of parallelization techniques which yield to more reliable collection distributions. Moreover, the results from these simulations will be used to determine the change in the shape of an airfoil due to ice accretion and its evolution in time.Marta Amalia Cordero GraciaMariola Gomez LopezAndrés Mateo2021-06-10T06:22:53Z2021-06-10T06:46:35Zhttps://oa.upm.es/id/eprint/57742This item is in the repository with the URL: https://oa.upm.es/id/eprint/577422021-06-10T06:22:53ZIceANS tool: Ice Accretion Numerical Simulation. Computational StrategiesSimulation of ice accretion on aerodinamyc surfaces, rotors and other components represents an important issue for aeronautical industry. In icing simulations large and complex ice shapes are created on the surfaces embedded in large size CFD meshes. These configurations are currently computed in several steps stopping when the ice shapes becomes too large, at which point a new mesh has to be created to allow for further CFD and ice growth simulations to be performed. The whole process is very complex and involves topics such as: mesh topology generation, trajectory integration of a huge amount of simulated droplets, so to achieve a high computational efficiency is essential to address it. The nature of the problem favours the use of parallelization techniques. In this work we describe the computational strategies developed in the software IceANS (Ice Accretion Numerical Simulation) that calculates the amount of water collected by a surface immersed in a fluid flow using a Lagrangian approach and determines the shape of the new surface of the airfoil.Mariola Gomez LopezMarta Amalia Cordero GraciaAndrés Mateo2021-03-18T11:13:33Z2021-03-18T11:13:33Zhttps://oa.upm.es/id/eprint/54697This item is in the repository with the URL: https://oa.upm.es/id/eprint/546972021-03-18T11:13:33ZTemporal extrapolation of quasi-periodic solutions via DMD-like methodsThe main goal of this paper is to study the performance of a DMD-based extrapolation technique for reduced order modeling. The DMD-based model is tested in a quasi-periodic solution of an external flow around a multi-body configuration, which is made up of three bodies: two square cylinder and a circular cylinder. The results show the suitable performance of this type of models to accelerate numerical simulations.Víctor BeltránSoledad Le Clainche MartínezJosé M. Vega2021-03-16T08:52:01Z2021-03-16T08:52:01Zhttps://oa.upm.es/id/eprint/54694This item is in the repository with the URL: https://oa.upm.es/id/eprint/546942021-03-16T08:52:01ZCharacterization of the wake past a two-dimensional multi-body cylinder arrangementThe wake interaction of an unsymmetrically distributed multi-body arrangement of twodimensional cylinders has been characterized by the analysis of its spatio-temporal structure using higher order dynamic mode decomposition HODMD. The comparison between different Reynolds numbers and cylinder arrangements shows time periodic responses for all cases at low Reynolds numbers, whereas the response is quasi-periodic at larger Reynolds numbers for two and three body cases. Furthermore, in the multi-body cases at higher Reynolds numbers, the fundamental frequencies for the involved singular bodies are identified, as well as new fundamental frequencies that seem to be associated with the system response as a whole entity.Víctor Beltrán MartínezSoledad Le Clainche MartinezJose M. Vega de Prada2021-02-05T11:08:04Z2021-02-05T11:08:04Zhttps://oa.upm.es/id/eprint/54695This item is in the repository with the URL: https://oa.upm.es/id/eprint/546952021-02-05T11:08:04ZFlow structures in the turbulent wake of a cross-flow wind turbineThis article presents a description of the spatio-temporal flow structures found behind a cross-flow wind turbine under turbulent flow conditions. Higher order dynamic mode decomposition (HODMD) is applied to analyze both, the wake and the rotating area near the blades when simulated using a high order discontinuous Galerkin method with sliding meshes. The analysis of the flow velocities shows a marked asymmetry of the wake. This phenomenon is illustrated by the statistical analysis provided by a Reynolds decomposition and backed up through the dynamic mode analysis. Additionally, the results show that the flow is composed by a mode whose fundamental frequency is the frequency of rotation of the wind turbine and its harmonics. This fundamental frequency can be related to a traveling wave, moving in the streamwise direction of the flow.Gema Ramos CasadoVíctor Beltrán MartínezSoledad Le Clainche MartinezEsteban FerrerJ.M. Vega de Prada2021-02-04T11:46:45Z2021-02-04T11:46:45Zhttps://oa.upm.es/id/eprint/61370This item is in the repository with the URL: https://oa.upm.es/id/eprint/613702021-02-04T11:46:45ZTopological derivative methods for damage detectionThis paper deals with the use of the topological derivative as a structural health monitoringmethod, for locating the presence of flaws in an aluminium plate. By minimizing a scalar ob-jective function that measures the least squares difference between the measured and calculatedsignals, flaws can be detected. The topological derivative somehow describes the sensitivity ofthe objective function to localized perturbations of the material properties due to the defectspresence. Here, we reconstruct small defects via the topological derivative by using multi-frequency synthetic data, for several representative configurations of the actuators and sensors,and several defect locations. Among these, some fairly demanding configurations are consideredthat are not accessible to conventional methods, such as actuators and sensors located very closeto the plate boundary and defects located beyond both elongated through-slits and elongatedinclusions of a different material.Anjo Martinez DominguezAlfredo Gümes GordoJosé Manuel Perales PeralesJ.M. Vega de Prada2021-02-03T08:17:29Z2021-02-03T08:17:29Zhttps://oa.upm.es/id/eprint/61423This item is in the repository with the URL: https://oa.upm.es/id/eprint/614232021-02-03T08:17:29ZDefect detection combining multifrequency ultrasonic guided waves and topological derivativeUltrasonic guided waves are an attractive alternative to conventional methods.By analyzing these waves, the presence of aws may be detected. Mathematically, this is aninverse problem. A large variety of mathematical methods to solve inverse problems consist inminimizing an instrumental objective function, which gives the difference between the measuredand calculated signals. Among these, the topological derivative describes the sensitivity of theobjective function to in nitesimal inclusions on the material. In this work we investigate thereconstruction of an obstacle buried in an aluminium plate by a non-iterative method based onthe computation of topological derivatives. This is done by extending to the present context someideas by Funes et al. (2016) that gave very good results in the context of the two-dimensionalwave equation. The main purpose is to suitably combine multi-frequency data obtained viapiezoelectric emitters and receivers. In the rst part of the work, the method to detect defectsis described. In the second part, as a proof of the concept, some reconstruction examples areshown.Anjo Martinez DominguezAlfredo Gümes GordoJosé Manuel Perales PeralesJ.M. Vega de Prada2021-02-03T07:46:55Z2021-02-03T07:46:55Zhttps://oa.upm.es/id/eprint/61421This item is in the repository with the URL: https://oa.upm.es/id/eprint/614212021-02-03T07:46:55ZDefect detection combining multifrequency ultrasonic guided waves and topological derivativeUltrasonic guided waves are an attractive alternative to conventional methods because the elastic waves emitted at one location travel over along distance. By analyzing these waves, the presence of flaws may be detected. Mathematically, this is an inverse problem. A large varietyofmathematical methods to solve inverse problems consist in minimizing an instrumental objective function, which gives the difference betweenthe measured and calculated signals. Among these, the topological derivative describes the sensitivity of the objective function to infinitesimalinclusions on the material.Anjo Martinez DominguezAlfredo Gümes GordoJosé Manuel Perales PeralesJ.M. Vega de Prada2020-01-27T10:27:03Z2020-01-27T10:27:03Zhttps://oa.upm.es/id/eprint/54698This item is in the repository with the URL: https://oa.upm.es/id/eprint/546982020-01-27T10:27:03ZAn alternative method to calculate cross-flow instabilitiesThis work presents a new method to compute instabilities associated to cross-flow transition scenarios. The method analyses base flows issued from CFD simulations (RANS model) using higher order dynamic mode decomposition (HODMD). The flow field is then approximated as an expansion of modes and it is possible to identify the primary and secondary flow instabilities, in cross-flows. The good performance of this novel method is first validated by locating the transition point related to the first instability in a low-speed 2D NLF0416 airfoil. Then, 3D cross-flow instabilities over a wing with 40◦ back-sweep angle (shaped from a NACA642A015 airfoil) are presented.Soledad Le Clainche MartínezMeng WuZhong HanEsteban Ferrer2020-01-23T10:07:26Z2020-01-23T10:07:26Zhttps://oa.upm.es/id/eprint/54696This item is in the repository with the URL: https://oa.upm.es/id/eprint/546962020-01-23T10:07:26ZThe influence of the cavity in the flow structures of a zero-net-mass-flux jetThe main goal of this study is to obtain the dominant frequencies and wavenumbers related to the main flow structures of a zero-net-mass-flux (ZNMF) jet. For this purpose, numerical simulations have been carried out at Reynolds Number 1000. The influence of including a cavity for the ZNMF piston is also studied. With this aim, the data obtained from the numerical simulations are analysed using higher order dynamic mode decomposition. The method has been applied in both directions, time and space. The results show that the effect of including a cavity increases the flow complexity.Mauro ViturroSoledad Le Clainche MartínezJosé M. VegaJulio Soria2020-01-22T10:38:13Z2020-01-22T10:38:26Zhttps://oa.upm.es/id/eprint/55608This item is in the repository with the URL: https://oa.upm.es/id/eprint/556082020-01-22T10:38:13ZEigenmode optimization of a contraction channel based on stability analysisThis work studies flow control in a channel flow with a sudden geometry contraction. Optimization investigations have been carried out aiming at minimizing the amplification rate of the most unstable mode, to keep the symmetric flow topology in the contraction channel. In this framework, the DLR-TAU code is employed to obtain the compressible base flow solution, from which the critical Reynolds numbers for the bifurcations have been found. A first-discretize-then-linearize approach was used, taking advantage of the linear Jacobian matrix implementation present in the DLR-TAU code for stability analysis, from which the eigenmodes responsible for the bifurcations are obtained. A geometry parametrized representation, an FFD mesh deformation program and a dynamically updated RBF surrogate model are developed to drive the optimization investigation. In this investigation, geometry configurations with negative amplification rates have been obtained, making the eigenmodes stable. The potential of the method is illustrated by the increase of critical Reynolds number of bifurcation.Yinzhu WangAlejandro Martínez CavaYao ZhengEsteban Ferrer2020-01-10T10:56:50Z2020-01-10T10:56:50Zhttps://oa.upm.es/id/eprint/57652This item is in the repository with the URL: https://oa.upm.es/id/eprint/576522020-01-10T10:56:50ZCoanda Flow Characterization on Base Bleed Configurations Using Global Stability AnalysisBase pressure control is often employed on drag reduction design, but the interaction of the jet with the base region flow topology can generate undesired or uncontrolled flow
configurations. The ejected flow can drive pressure bifurcations at the trailing edge, that without a correct optimization can affect the aerodynamic performance of the system. The purpose of this work is to fully understand the physical mechanisms related with the use of injected base bleed employing global stability analysis and adjoint methodologies. Moreover, the results of the sensitivity analysis are used to identify the regions more receptive to passive and active flow control methodologies. This work has particular relevance in turbine research, where coolant flow is ejected at the trailing edge to ensure adequate thermal protection of the blade and the downstream turbine stages.Alejandro Martínez-Cava Aguilaralejandro.martinezcava@upm.esEusebio Valero Sánchezeusebio.valero@upm.esJavier de Vicente Buendiafj.devicente@upm.esGuillermo Paniaguagpaniagua@purdue.edu2020-01-10T10:39:54Z2020-01-10T10:39:54Zhttps://oa.upm.es/id/eprint/54699This item is in the repository with the URL: https://oa.upm.es/id/eprint/546992020-01-10T10:39:54ZDamage detection in two-dimensional plates via infrared thermographyIn this paper, we study the use of active infrared thermography combined with topological derivatives for non-destructive testing of two-dimensional plates. In comparison with other remote testing techniques, like ultrasonics, thermography is less intrusive and non-contact. However, on the other hand, heat transport is a short-range phenomenon and the associated signal-to-noise ratio is less favourable. Despite of this, we will show that the topological derivative is a very powerful tool for processing steady and time-harmonic thermograms to detect inclusions and defects in aluminium plates.Manuel PenaMaria Luisa Rapun Banzo2019-06-07T05:28:01Z2019-06-30T22:30:03Zhttps://oa.upm.es/id/eprint/55362This item is in the repository with the URL: https://oa.upm.es/id/eprint/553622019-06-07T05:28:01ZBuilding Energy Modeling by means of BIM software. A case study with Water Flow GlazingBuilding energy modelling is an inter-disciplinary area of research which involves, among others, concepts of electrical and software engineering, mechanical engineering and also, architecture. Building energy models are used at the design stage for the purpose of energy code compliance certification. The accuracy of results depends on how well the building model has been developed and calibrated. Most of the programs available in the market take into account occupancy pattern behavior, thermal parameters of construction elements, hvac and lighting systems. However, the impact of thermal mass and the influence of active energy management systems have not been accurately reported. This paper presents a review of significant modeling methodologies which have been developed and adopted to model the energy behavior of buildings. A BIM-oriented methodology for building energy modeling will be presented. This research has included case studies to investigate the feasibility of modeling active systems, such as water flow glazing. Finally, the ability of transferring data among different software is also studied.Fernando del Ama Gonzalofernandodelama@gmail.comJose Antonio Ferrandizjaferrandiz@nsu.eduBelén Moreno Santamariabelen.moreno@upm.es2019-06-05T12:05:33Z2019-07-01T22:30:19Zhttps://oa.upm.es/id/eprint/55358This item is in the repository with the URL: https://oa.upm.es/id/eprint/553582019-06-05T12:05:33ZThickness dimensioning of water flow glazing facadesThe fluid inside water fluid glazing facades creates a linear distribution pressure along the vertical direction. Hence, the glazings must be designed to with stand pressure loads satisfying deflection and stresses requirements given by the norms and standards. The straightforward solution is to increase the glass thickness until the deflection is below the required limit. This implies an increase in weight and amount of material rising the price of the glazing, which is undesirable. Therefore, pillars or stripes can be considered as an alternative solution to limit glass deflection.
In order to ensure that the structural behavior requirements are fulfilled, a proper mathematical model and simulation must be carried out. The elastic plate model must be sufficiently detailed to retain the most relevant physical aspects of the process but simple enough not to over dimension the problem. To solve the mathematical model, it was necessary to apply a numerical method to the partial differential equations resultant. For this task a High Order Finite Difference Method (HOFM) was implemented for both linear and non-linear models, which led to satisfactory results from the viewpoint of the accuracy of the solution.
From the development of the structural model and simulation for Water Flow Glazings thickness dimensioning two conclusions were extracted. First, the plate model was sufficient to dimension the glazings and second, the presence of pillars or stripes permits to reduce significantly the thickness dimension. Hence, introducing pillars or stripes is considered an effective solution to solve the hydrostatic pressure problem and lead to a more efficient design of Water Flow Glazings.F. Javier Escotojavier.escoto.lopez@alumnos.upm.esJuan A. Hernandez Ramosjuanantonio.hernandez@upm.es2019-05-31T06:34:04Z2019-05-31T06:34:17Zhttps://oa.upm.es/id/eprint/55292This item is in the repository with the URL: https://oa.upm.es/id/eprint/552922019-05-31T06:34:04ZAutomation Platform as an Advanced Energy Management SystemNowadays high-rise buildings with Water Flow Glazing envelopes require the implementation of strategies based on advanced concept of energy management as well as predictive maintenance services. In order to cover these needs, a controlling and data-logging platform called AtenTTo has been developed. This article treats the design and implementation of the AtenTTo. This Electronic Control Unit is a hardware and software platform that comprises two PCB: (i) AtenTTo Core, which is the brain of the system, and (ii) AtenTTo Multipurpose in which the brain is plugged allowing connecting specific sensors and actuators. To facilitate AtenTTo integration, the design of the multipurpose platform adjusts to the size of a standard DIN rail box. Furthermore, and in order to facilitate the user to program the system, AtenTTo software allows configuring the system with code-less programming. The result is a multipurpose, versatile Printed Circuit Board integrated in a standard DIN rail box for monitoring and controlling buildings. The platform provides a graphic interface that allows programming any energy strategy considering different parameters such as, outdoor climate, HVAC system, passive material influences and user behaviorMiguel A. Rapado Tamaritmiguelangel.rapado.tamarit @alumnos.upm.esJuan Antonio Hernández Ramosjuanantonio.hernandez@upm.es2019-05-21T08:30:47Z2019-05-21T08:30:47Zhttps://oa.upm.es/id/eprint/55129This item is in the repository with the URL: https://oa.upm.es/id/eprint/551292019-05-21T08:30:47ZSoftware tool for the design of water flow glazing envelopesWater flow glazing facades are considered active envelopes able to react or to adapt to the external and internal conditions of the building. The use of the building, the orientation of the facade and the location of the project are relevant inputs to determine the glazing composition as well as the energy strategy involved in the facade. A proper design of the glazing composition and the energy strategy will allow huge energy savings in the whole project.
To achieve this goal, a software tool has been developed to allow the design of a water flow glazing facade. The software tool is an open software code with a graphical user interface. It comprises (i) energy balance considerations associated to potential sun energy for specific locations, (ii) spectral properties of the glazing based on the selection of different glass layers or coatings, (iii) thermal performances of the glazing module based on the absorption properties and (iv) a thermal simulator of zones including insulated opaque facades and water flow glazing facades.
The main result of this work is a software tool to allow project engineers to design water flow glazing facades. Understanding active facades as transparent thermal collectors are carried out by thermal simulation movies. This tool allows the project engineer to determine the water heat gain during the whole year. Besides the graphical user interface, this work constitutes a complete library to simulate water flow glazing envelopes written in modern Fortran. This library has a documented application program interface that allows developers to integrate water flow glazing envelopes in existing energy simulators for buildings.Belén Moreno Santamariabelen.moreno@upm.esJuan A. Hernandez Ramosjuanantonio.hernandez@upm.es2019-05-21T08:19:23Z2019-05-21T08:19:33Zhttps://oa.upm.es/id/eprint/55125This item is in the repository with the URL: https://oa.upm.es/id/eprint/551252019-05-21T08:19:23ZIndustrialization of Water Flow Glazing facades by means of modular unitsWater Flow Glazing façade is a new and disruptive technology based on variable heating/ cooling glazed modules, which enables cost efficient nZEB with glass façade. These modules allow getting maximum transparency for full utilization of daylight in buildings while achieving savings on lighting and thermal energy for nZEB. The industrialization of Water Flow Glazing facades through modular units aims to reduce the complexity of the system encapsulating the components. Hence, cost reduction potentials in building construction are also evaluated. This article treats a full description of the Water Flow Glazing modular unit, based on its three main elements: glazing, circulator, and aluminum frame. The glazing comprises different layers and interfaces according to determined spectral and thermal properties. The circulator is a key element that allows the circulation of water inside the glazing chamber in a closed circuit, exchanging the temperature between indoors and outdoors. Finally, the aluminum frame that encloses the secondary circuit is a frame-in-frame system, which provides the structural stability and easy installation. The result is an active plug-in WFG modular unit, easy to install and operate. Each module is connected to the cloud through a wireless sensor, in charge of monitoring and controlling the main variables and parameters. The dimension of the module is configurable according to the architectural project.Belén Moreno Santamariabelen.moreno@upm.esBenito Lauret Aguirregabiriabenito.lauret@upm.esJuan A. Hernandez Ramosjuanantonio.hernandez@upm.es2019-05-21T08:13:12Z2019-05-21T08:13:23Zhttps://oa.upm.es/id/eprint/55112This item is in the repository with the URL: https://oa.upm.es/id/eprint/551122019-05-21T08:13:12ZCommissioning process of water flow glazing facadesThe objective of commissioning is to provide documented confirmation that a facility fulfils functional and performance requirements. Commissioning recognizes the integrated nature of water flow glazing systems performance. Commissioning is carried out to prove that systems operate and perform to the design intent and specification. To reach this goal, it is necessary for the commissioning process to establish and document project requirements, performance specifications, and system functions. It is important to verify and document compliance with these criteria throughout the design, proof of concept, construction, and the initial period of operation. The commissioning process works in conjunction with the project design team through the design stage and the construction stage. It prepares a commissioning plan and final commissioning results. The main results of this work are the elaboration of detailed checklists for the design and the construction stages to assure that the water flow glazing facade is properly installed, started and checked out. During the installation, various tests are undertaken known as static testing. Upon completion of static testing, dynamic testing is undertaken. Generally, during the integration process, some equipment of the primary circuit is inoperative. Hence, emulation or simulation of specific equipment is needed to prove that the water ow glazing facade operates in accordance with specifications. In this work, functional tests are established to evaluate the thermal performance and operation of the equipment. Automation software and hardware platform are used to monitor thermal and comfort requirements and to expedite the commissioning process. The fulfilment of commissioning procedures for the project is recorded at the end of the construction phase.Diego Garciadiego.garciago@alumnos.upm.esBelén Moreno Santamariabelen.moreno@upm.esJuan A. Hernandez Ramosjuanantonio.hernandez@upm.es2019-04-08T09:47:32Z2019-04-08T09:47:32Zhttps://oa.upm.es/id/eprint/54308This item is in the repository with the URL: https://oa.upm.es/id/eprint/543082019-04-08T09:47:32ZSensitivity analysis of supersonic turbine trailing edgesThe use of compact architectures on aircraft turbine engines challenges the design and management of structural and thermal load requirements. Even operating in subsonic conditions, supersonic regimes may develop at the high pressure turbine pas- sages, experiencing complex compression and expansion wave systems that interact with adjacent stages of the turbine. When cooling flow is ejected through the blade trailing edge slots, non-symmetrical configurations can appear due to the interaction of the in- jected flow with the surrounding flow field, leading to undesired loads and efficiency loses. In this work, a combination of RANS simulations, global stability and sensitivity analy- sis is employed to identify and explain the physical mechanisms of this phenomenon. A global mode associated with the geometrical expansion of the trailing edge slot is iden- tified, and linked to the non-symmetrical configurations. To conclude, the regions where the flow would be more sensitive to flow modifications to excite or damp this phenomena are identified throughout an adjoint approximation.Alejandro Martinez-Cava AguilarEusebio ValeroJavier de Vicente2019-03-18T11:06:39Z2019-03-18T11:06:39Zhttps://oa.upm.es/id/eprint/52190This item is in the repository with the URL: https://oa.upm.es/id/eprint/521902019-03-18T11:06:39ZAsymptotic solution for the low-thrust restricted two-body problemA semi-analytical solution of the restricted two-body problem subject to an arbitrary low thrust is developed. The multiple scales perturbation method is used to split the problem into ?slow? and ?fast? scales. The small parameter that permits this approach is the ratio between thrust and gravitational acceleration. The thrust is expressed as a Fourier series expansion in terms of the fast scale, in which the coefficients are allowed to vary in the ?slow? scale. The spectral analysis of the equations of motion gives rise to reduced dynamics of the ?slow? motion. The results of the integration of this dynamical model are validated against the integration of the complete dynamics. Moreover, the preliminary results show that the propagation of the reduced dynamics are comparatively much more efficient than the complete dynamics, and show also the expected small errors of the method.Manuel Sanjurjo RivoClaudio BombardelliJesus Pelaez Alvarez2018-02-21T12:00:26Z2018-02-21T12:00:26Zhttps://oa.upm.es/id/eprint/46012This item is in the repository with the URL: https://oa.upm.es/id/eprint/460122018-02-21T12:00:26ZNumerical study of effect of wall heating conditions on heat transfer performance of internal cooling channelThis paper investigates the impacts of wall heating conditions on heat transfer performace for a rotating channel with one side smooth and one side roughened by 45 degree inclined ribs. Previous experimental and numerical studies for only ribbed wall heated case showed that rotation has significantly negative impact on heat transfer performance. In order to investigate this uncommon behaviour, RANS simulations were conducted under three different wall heating conditions in present study: ribbed wall heated, all walls heated and adiabatic conditions. Numerical results show that the uneven wall heating condtions has negligible impact on stationary case, however, it has a large influence on rotational cases, in both the heat transfer and the fluid field. This is because in rotating cases, uneven heatings result in different buoyancy effects on trailing and leading walls that alter the main flow velocity profile. As a consequence, also secondary flows and heat transfer performance are affected.Zhi WangRoque Corral Garcia2018-02-20T13:14:40Z2018-02-20T13:14:40Zhttps://oa.upm.es/id/eprint/45022This item is in the repository with the URL: https://oa.upm.es/id/eprint/450222018-02-20T13:14:40ZEffect of uneven wall heating conditions under different buoyancy numbers for a one side rib-roughened rotating channelAbstract This paper investigates the impacts of uneven wall heating conditions under different Buoyancy numbers on flow field and heat transfer performance of a rotating channel with one side smooth and one side roughened by 45 degree inclined ribs. Parametric RANS simulations were conducted under two different wall heating conditions: only ribbed wall heated, as in experiment setup, and all walls heated, under three different Buoyancy numbers. Results are compared, when available, with experimental results. Abstract Numerical results show that uneven wall heating has only a minor impact on non-rotating cases and very low buoyancy rotating cases. However, it has a significant influence, on both, the heat transfer behaviour and the flow field, when the Buoyancy number is large. In the ribbed trailing rotating tests, the all walls heated cases show significantly higher heat transfer rate than only the ribbed wall heated cases. The discrepancy is enlarged as Buoyancy number increases. The heat transfer in the all walls heated case increases monotonically with the Buoyancy number whereas in the ribbed wall heated case is slight reduced. In the ribbed leading rotating tests, the heat transfer sensitivity to the heating conditions is not conspicuous, and for both cases, the heat transfer level slightly reduced as Buoyancy number increases. Abstract The flow field investigation shows that, there is a significant displacement of main flow in the all walls heated cases than only the ribbed wall heated cases under high Buoyancy numbers. This displacement is due to the buoyancy effect and responsible for the heat transfer differences in uneven heating problems. According to the results obtained in the paper, we conclude that when buoyancy effects are relevant, the heating settings can play a significant role in the heat transfer mechanisms and therefore in the experimental and numerical results.Zhi WangRoque Corral Garcia2018-01-29T12:42:22Z2018-01-29T12:42:22Zhttps://oa.upm.es/id/eprint/48678This item is in the repository with the URL: https://oa.upm.es/id/eprint/486782018-01-29T12:42:22ZDomain Reduction Strategy for Stability Analysis of a NACA0012 airfoilA new reduction domain strategy is applied in the framework of stability analysis for industrial applications. The aim of this work is to investigate if the geometrical approach proposed could be used as alternative or in combination with the numerical techniques that are currently employed for alleviating the prohibitive computational costs associated to the study of the stability of complex
aerodynamic ows.Global linear stability analysis has been applied to a NACA0012 airfoil to study the transient
bu�et phenomenon. The leading disturbance associated to bu�eting remains located in a inner región of the computational domain, making this problem a perfect test case for the domain reduction strategy presented here. The base ow has been obtained using DLR-TAU code on a �rst �ne mesh (100 chords) while di�erent, smaller meshes have been used to perform the stability analysis. The eigenvalue problem associated to stability has been solved using a Krylov-Schur projection method with direct LU preconditioning. Results show that the reduction in the computational domain is an useful technique to recover disturbances bounded in a particular region of the aforementioned domain.Silvia SanvidoGennaro AbruzzeseJavier de Vicente BuendiaEusebio Valero Sánchez2018-01-23T11:24:41Z2018-01-23T11:24:41Zhttps://oa.upm.es/id/eprint/48802This item is in the repository with the URL: https://oa.upm.es/id/eprint/488022018-01-23T11:24:41ZUso de los métodos de cálculo diferencial de Leibniz y Newton en los libros de texto de la Biblioteca Histórica de la UCM en torno al siglo XVIIIInvestigación en curso sobre los libros de texto de cálculo diferencial en el siglo XVIII. En esta ponencia se presenta el uso de las terminologías del cálculo de fluxiones de Newton y el cálculo diferencial de Leibniz en los libros del siglo XVIII.Emilia Palma Villalon2017-05-09T09:31:12Z2017-05-09T09:31:12Zhttps://oa.upm.es/id/eprint/42008This item is in the repository with the URL: https://oa.upm.es/id/eprint/420082017-05-09T09:31:12ZTransition prediction in incompressible boundary layer with finite-amplitude streaksModulating the boundary layer velocity profile is a very promising strategy for achieving transition delay, and thus reducing the friction of the plate. An usual way to perform it is by perturbing the flow with counter-rotating vortices that exhibit transient, non-modal growth and lead to streamwise aligned streaks inside the boundary layer, which have been proved (theoretical and experimentally) to be very robust flow structures. Recently, a new mechanism of generating high amplitude streaks has been proposed, consisting on miniature vortex generators (MVGs), increasing considerably the potential stabilization effect. Hence, we propose a numerical tool to analyze the stability properties of the streaky flow without big computational resources. Since streaks depend on how they are generated, and it is linked to the geometric configuration of the surface, a cheap CPU numerical analysis is required in order to perform large parametric studies for streak optimization. For this end, we use the reduced Navier-Stokes (RNS) equations to simulate the nonlinear downstream evolution of finite amplitude streaks in incompressible boundary layer flow. Regarding the stability analysis, the linear three-dimensional Parabolized Stability Equations (PSE-3D) concept constitutes the best candidate for this task. Herein, we present a thorough parametric study of the instability characteristic with respect to critical conditions of the modified incompressible zero-pressure-gradient flat-plate boundary layer by means of finite-amplitude linearly optimal disturbances or streaks. The parameter space is extended from low- to high- amplitude streaks, accurately documenting the transition delay for low-amplitude streaks and the amplitude threshold for streak shear layer instability or bypass transition, which drastically displaces the transition front upstream.Juan Angel Martin BautistaPedro Paredes Gonzalez2017-04-28T11:12:45Z2017-04-28T11:12:45Zhttps://oa.upm.es/id/eprint/44785This item is in the repository with the URL: https://oa.upm.es/id/eprint/447852017-04-28T11:12:45ZA design for rapid transit networks considering rolling stock's reliability and redistribution of services during disruptionsThis paper presents a model for designing a public transit network system combining the traditional approach of transport demand coverage in bimodal scenarios of operation with the recovery of possible disruptions due to limited reliability of the rolling stock. The model balances construction and operational costs with the benefits to the users for the optimization of their travel times. Two transportation modes have been considered, public and private transport and the proportion of the users choosing one mode or the other is assumed to obey to a bimodal logit choice model. While construction costs are a first stage decision, user travel costs and recovery action costs are scenario dependent. Two types of scenarios are taken into account: a) the scenarios of normal operation and b) disruption scenarios which are associated to a link's breakdown of the network. The disruptions in the links are assumed to follow a probability disruption model accordingly to the number of services that operate on them. The model can be used to analyze the influence of the rate of failures of the units on the reliability of the designed RTN. The proposed model can be considered as a two recourse stochastic programming model with a bi-level structure where the probabilities of failure are an implicit function of the number of services and the routing of the transit lines of the transport system. A heuristic solution method is examined for small to medium networks demonstrating the computational viability of the approach.Esteve Codina SanchoAngel Marín GraciaLidia Montero Mercade2017-04-28T09:37:46Z2017-04-28T09:37:46Zhttps://oa.upm.es/id/eprint/42556This item is in the repository with the URL: https://oa.upm.es/id/eprint/425562017-04-28T09:37:46ZEfficient low dimensional modelling based on POD and residual estimatesAn adaptive low dimensional model is considered to simulate time dependent dynamics in nonlinear dissipative systems governed by partial differential equations. The method combines "on the fly" a standard numerical solver and a much more computationally inexpensive Galerkin system. The latter is constructed by projecting the governing equations onto adapting sets of POD modes, resulting from snapshots computed by the numerical solver. The strategy is based on a truncation error estimate and a residual estimate, designed to control the truncation error and the mode truncation instability, respectively. These estimates support the selection of the appropriate time intervals in which the numerical solver is run to first construct and then update, on demand, the POD modes. Furthermore, in order to reduce the computational effort needed at the outset to generate the initial POD subspace, some mode libraries are taken into account. Such libraries may either be generic (e.g., constructed from orthogonal polynomials) or result from different, former simulations.Maria Luisa Rapun BanzoFilippo TerragniJose Manuel Vega De Prada2017-04-28T07:59:09Z2017-04-28T07:59:09Zhttps://oa.upm.es/id/eprint/42547This item is in the repository with the URL: https://oa.upm.es/id/eprint/425472017-04-28T07:59:09ZFast time integration of PDEs combining POD and Galerkin projection based on a limited set of mesh pointsRecently, an adaptive method to accelerate time dependent numerical solvers of systems of PDEs that require a high cost in computational time and memory has been proposed [3] (see also [1, 2]). The method combines on the fly such numerical solver with a proper orthogonal decomposition, from which we identify modes, a Galerkin projection (that provides a reduced system of equations), and the integration of the reduced system. The strategy is based on a truncation error estimate and a residual estimate, designed to control the truncation error and the mode truncation instability, respectively. These estimates support the selection of the appropiate time intervals in which the numerical solver is run to first construct and then update, on demand, the POD modes. Moreover, to reduce the computational effort needed at the outset to generate the initial POD subspace, information from former simulations or generic libraries (e.g. trigonometric functions or orthogonal polynomials) were also used. To improve the computational efficiency of the method presented in [3] a crucial step is to use a limited number of points (instead of the whole computational mesh used in the spatial discretization) to both perform POD and to Galerkin?project the equations. In this work we will discuss and compare several alternatives in representative examples illustrating that a suitable point selection can make the cost of the reduced order model (associated with POD, Galerkin projection and the integration of the resulting Galerkin system) negligible compared to that of the reference numerical solver.Maria Luisa Rapun BanzoJose Manuel Vega De PradaFilippo Terragni2017-03-16T09:01:45Z2017-03-16T09:01:45Zhttps://oa.upm.es/id/eprint/41712This item is in the repository with the URL: https://oa.upm.es/id/eprint/417122017-03-16T09:01:45ZAerodynamic shape optimization of a 3D wing via volumetric B-SplinesThis paper shows a gradient-based aerodynamic shape optimization of a threedimensional wing using volumetric B-Splines. The wing is enclosed in a volumetric parallelepiped, commonly referred as control box, which can be seen as a rubber box that deforms the enclosed space. The deformation of the wing is provided by the manipulation of the control points, where the gradients are calculated using the continuous adjoint solution. This technique can be applied to arbitrary three dimensional complex designs and provides some advantages over other traditional geometry parameterization methods, such as deformation locality and the ability to handle some geometric constraints.Mario Jaime Martín BurgosEsther Andrés PérezMariola Gomez Lopez2017-02-03T12:59:04Z2017-02-03T12:59:04Zhttps://oa.upm.es/id/eprint/42549This item is in the repository with the URL: https://oa.upm.es/id/eprint/425492017-02-03T12:59:04ZPOD on the fly: an adaptive combination of CFD and POD to simulate complex dynamicsReduced order models is a fashionable field that aims at dramatically reducing the computational cost of standard numerical solvers. Such reduction is possible when the number of physically relevant degrees of freedom is much smaller than the number of `numerical degrees of freedom'. POD on the fly combines short runs of a standard numerical solver with a low-dimensional system, which is used for the majority of the simulation. The basic ideas of this strategy will be outlined and applications to various fields (including the complex Ginzburg?Landau equation, the unsteady lid?driven cavity, an aero?elastic system, and a subsurface oil?reservoir simulation) briefly reportedJose Manuel Vega De PradaMaria Luisa Rapun BanzoFernando Varas MeridaSoledad Le Clainche MartínezFilippo TerragniRuben Moreno2017-02-03T12:23:16Z2017-02-03T12:23:16Zhttps://oa.upm.es/id/eprint/39463This item is in the repository with the URL: https://oa.upm.es/id/eprint/394632017-02-03T12:23:16Z35 años de educación popular en los barrios de MadridLas escuelas populares son organizaciones de base para la Educación de Personas Adultas, el aprendizaje colectivo y la transformación social. Son organizaciones basadas en el voluntariado y en la gratuidad, resultan de la capacidad de la iniciativa social para auto organizarse y responder a las necesidades culturales de la comunidad.Pedro Plaza MenendezRosa Poza Bartolomé2016-12-05T13:51:14Z2016-12-05T13:51:14Zhttps://oa.upm.es/id/eprint/41713This item is in the repository with the URL: https://oa.upm.es/id/eprint/417132016-12-05T13:51:14ZAdaptation of the computational grid to a moving wing-fuselage intersection via nurbs and radial basisThis paper proposes two approaches to automatically adapt the computational grid at the presence of moving intersections between surface components, such as wing-fuselage assemblies. The first method is based on the underlying CAD definition, which is represented by Non-Uniform Rational B-Splines (NURBS). The second method employs Radial Basis Functions (RBFs). Both methods have been tested to fix the surface grid of an DLR F6 wing-body configuration, where the wing geometry has been deformed at the intersection with the fuselage. The proposed strategies are suitable for both structured and unstructured computational grids and can be deployed in an industrial context to adapt the computational grid upon deformations of surface componentsMario Jaime Martín BurgosMarta Amalia Cordero GraciaMariola Gomez Lopez2016-11-24T08:59:58Z2016-11-24T08:59:58Zhttps://oa.upm.es/id/eprint/41679This item is in the repository with the URL: https://oa.upm.es/id/eprint/416792016-11-24T08:59:58ZLas competencias matemáticas en el PIAAC desde el aprendizaje a lo largo de la vidaPedro Plaza MenendezInés Sancha Gonzalo2016-11-24T08:53:18Z2016-11-24T08:53:18Zhttps://oa.upm.es/id/eprint/41696This item is in the repository with the URL: https://oa.upm.es/id/eprint/416962016-11-24T08:53:18Zq-Statistics on symmetric generalized binomial distributionsGuiomar Ruiz LopezConstantino Tsallis2016-11-23T09:04:54Z2016-11-23T09:04:54Zhttps://oa.upm.es/id/eprint/41707This item is in the repository with the URL: https://oa.upm.es/id/eprint/417072016-11-23T09:04:54ZLas matemáticas en el aprendizaje a lo largo de la vida: un problema sin resolverA pesar de la necesidad de la alfabetización numérica en el desarrollo integral de las personas para que se puedan enfrentar a un mundo sin desconfianza, con autonomía y con conciencia crítica, la realidad nos devuelve una relación de olvido favorecida por el imaginario colectivo que las matemáticas tienen en la vida diaria. Necesitamos tratar las matemáticas como una actividad humana más que una ciencia, desmitificándola y trabajando con ella desde situaciones de utilidad. Esta forma de pensar, nos llevará a tomar acciones concretar de cómo aprender las matemáticas en el aprendizaje a lo largo de la vida.Pedro Plaza Menéndez2016-11-22T12:44:04Z2016-11-22T12:44:04Zhttps://oa.upm.es/id/eprint/40207This item is in the repository with the URL: https://oa.upm.es/id/eprint/402072016-11-22T12:44:04ZNumerical studies of non-linear intrinsic streaks in the flat plate boundary layerThe development of streaky perturbations near the leading edge of a flat plate boundary layer was analyzed by Luchini (1996) using a description of the flow linearized around the Blaius solution. He found that there is just one single streaky mode (periodic in the spanwise direction) that grows downstream from the leading edge. The presence of this mode in the linear approximation indicates that, for the complete non-linear problem, there is an one parameter family of streak solutions that grow from the leading edge of the boundary layer. This family of steady 3D non-linear intrinsic streaks (intrinsic because they appear in the complete absence of any free stream perturbation) was recently non-linearly computed, using the Reduced Navier-Stokes formulation to describe its downstream evolution far away from the linear region. In this work, we enlarge the analysis of the transversal structure of the streaks. Furthermore, the stability characteristics of the streaky boundary layer flow is presented using the three-dimensional Parabolized Stability Equations (PSE-3D) and spatial BiGlobal analysis formulations, which have been successfully employed in flows that are inhomogeneous in two directions and weakly dependent along the third spatial direction. The stability analysis results show that the intrinsic streaks damp Tollmien-Schlichting waves. This effect is increased as the amplitude of the streak grows. At a certain limit, as observed in linear optimal streaks, shear-layer modes become unstable, potentially producing bypass transition.Juan Angel Martin BautistaCarlos Martel EscobarPedro Paredes GonzalezVassilios Theofilis2016-10-20T10:35:12Z2016-10-20T10:35:12Zhttps://oa.upm.es/id/eprint/41711This item is in the repository with the URL: https://oa.upm.es/id/eprint/417112016-10-20T10:35:12ZA wake-integral method for drag predictionThis paper describes the theoretical development and implementation issues of a far field induced drag extraction tool based on the Maskell integral. Far field methods provide an alternative to classical near field approach, offering the possibility of decompose drag contributions based on their physical source and improves prediction accuracy on coarse meshes. Instead of classical triangulation of intersection nodes contained in the cutting plane, a more regular adaptive mesh is implemented in order to improve flow reconstruction smoothness and accuracy. Both meshes results are compared and the influence of generation parameters of the bidimensional adaptive mesh is discussed. Numerical diffusion plays a major role in vortex decay, and because of that phenomena, a correction factor is needed in order to back as much as possible the cutting plane without loosing precision. Finally, Onera M6 tests are conducted, showing acceptable precision in drag prediction until seven or more chords downstream.A. CarreMarta Amalia Cordero GraciaMariola Gomez LopezJorge Ponsin Roca2016-02-19T08:24:30Z2016-06-06T08:24:30Zhttps://oa.upm.es/id/eprint/36574This item is in the repository with the URL: https://oa.upm.es/id/eprint/365742016-02-19T08:24:30ZWind tunnel experiments to teach physicsInnovative teaching experimental activities for secondary school students have been developed in order to introduce some aerodynamic concepts, with the aim of making science subjects such as mathematics and physics more attractive. Post-graduate students of Universidad Politécnica de Madrid (UPM) and teachers of Deutsche Schule Madrid (DSM) have constructed a small wind tunnel. The main goal has been to provide a tool for secondary school students to become familiar with the scientific method developing curiosity, imagination, initiative, critical thinking and problem-solving skills. Students of DSM have performed wind tunnel experiments, resulting in a successful and amusing experience. The students were able to relate the experimental results obtained with the physic principle of flight, previously explained in class. Evaluations reveal that both, the teacher and the students, considered the experience as interesting and helpful to lead with teaching physics, mathematics and engineering sciences. The teacher observed the strong motivation factor developed for the students to continue learning engineering sciences. Some of the students expressed that this experience had changed their prejudices about physics and mathematics, based only on theoretical approaches.Soledad Le Clainche MartinezVassilios TheofilisWei HeJuan Angel Tendero VentanasQiong LiuJose Miguel Perez PerezM. Schlapkohl