The scenario of two-dimensional instabilities of the cylinder wake under EHD forcing: A linear stability analysis

D'Adamo, Juan; González Gutierrez, Leo Miguel; Gronskis, Alejandro y Artana, Guillermo (2011). The scenario of two-dimensional instabilities of the cylinder wake under EHD forcing: A linear stability analysis. En: "6th Theoretical Fluid Mechanics Conference", 27/06/2011 - 30/06/2011, Honolulu, HI, EEUU. pp. 1-18.

Descripción

Título: The scenario of two-dimensional instabilities of the cylinder wake under EHD forcing: A linear stability analysis
Autor/es:
  • D'Adamo, Juan
  • González Gutierrez, Leo Miguel
  • Gronskis, Alejandro
  • Artana, Guillermo
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: 6th Theoretical Fluid Mechanics Conference
Fechas del Evento: 27/06/2011 - 30/06/2011
Lugar del Evento: Honolulu, HI, EEUU
Título del Libro: Proceedings of 6 th Theoretical Fluid Mechanics Conference
Fecha: 2011
Materias:
Escuela: E.T.S.I. Navales (UPM)
Departamento: Enseñanzas Básicas de la Ingeniería Naval [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

We propose to study the stability properties of an air flow wake forced by a dielectric barrier discharge (DBD) actuator, which is a type of electrohydrodynamic (EHD) actuator. These actuators add momentum to the flow around a cylinder in regions close to the wall and, in our case, are symmetrically disposed near the boundary layer separation point. Since the forcing frequencies, typical of DBD, are much higher than the natural shedding frequency of the flow, we will be considering the forcing actuation as stationary. In the first part, the flow around a circular cylinder modified by EHD actuators will be experimentally studied by means of particle image velocimetry (PIV). In the second part, the EHD actuators have been numerically implemented as a boundary condition on the cylinder surface. Using this boundary condition, the computationally obtained base flow is then compared with the experimental one in order to relate the control parameters from both methodologies. After validating the obtained agreement, we study the Hopf bifurcation that appears once the flow starts the vortex shedding through experimental and computational approaches. For the base flow derived from experimentally obtained snapshots, we monitor the evolution of the velocity amplitude oscillations. As to the computationally obtained base flow, its stability is analyzed by solving a global eigenvalue problem obtained from the linearized Navier–Stokes equations. Finally, the critical parameters obtained from both approaches are compared.

Más información

ID de Registro: 12796
Identificador DC: http://oa.upm.es/12796/
Identificador OAI: oai:oa.upm.es:12796
Depositado por: Memoria Investigacion
Depositado el: 13 Dic 2012 12:16
Ultima Modificación: 21 Abr 2016 12:04
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