Characteristics of the turbulent/nonturbulent interface in boundary layers, jets and shear-free turbulence

Da Silva, Carlos; Taveira, Rodrigo y Borrel Nogueras, Guillem (2014). Characteristics of the turbulent/nonturbulent interface in boundary layers, jets and shear-free turbulence. "Journal of Physics: Conference Series", v. 506 (n. 1); pp.. ISSN 1742-6596. https://doi.org/10.1088/1742-6596/506/1/012015.

Descripción

Título: Characteristics of the turbulent/nonturbulent interface in boundary layers, jets and shear-free turbulence
Autor/es:
  • Da Silva, Carlos
  • Taveira, Rodrigo
  • Borrel Nogueras, Guillem
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Physics: Conference Series
Fecha: 2014
Volumen: 506
Materias:
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Mecánica de Fluidos y Propulsión Aeroespacial
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

The characteristics of turbulent/nonturbulent interfaces (TNTI) from boundary layers, jets and shear-free turbulence are compared using direct numerical simulations. The TNTI location is detected by assessing the volume of turbulent flow as function of the vorticity magnitude and is shown to be equivalent to other procedures using a scalar field. Vorticity maps show that the boundary layer contains a larger range of scales at the interface than in jets and shear-free turbulence where the change in vorticity characteristics across the TNTI is much more dramatic. The intermittency parameter shows that the extent of the intermittency region for jets and boundary layers is similar and is much bigger than in shear-free turbulence, and can be used to compute the vorticity threshold defining the TNTI location. The statistics of the vorticity jump across the TNTI exhibit the imprint of a large range of scales, from the Kolmogorov micro-scale to scales much bigger than the Taylor scale. Finally, it is shown that contrary to the classical view, the low-vorticity spots inside the jet are statistically similar to isotropic turbulence, suggesting that engulfing pockets simply do not exist in jets

Proyectos asociados

TipoCódigoAcrónimoResponsableTítulo
FP7ERC-2010.AdG-20100224Sin especificarSin especificarSin especificar

Más información

ID de Registro: 37464
Identificador DC: http://oa.upm.es/37464/
Identificador OAI: oai:oa.upm.es:37464
Identificador DOI: 10.1088/1742-6596/506/1/012015
URL Oficial: http://iopscience.iop.org/article/10.1088/1742-6596/506/1/012015/pdf
Depositado por: Memoria Investigacion
Depositado el: 14 Oct 2015 10:28
Ultima Modificación: 14 Oct 2015 14:12
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