Observatorio de I+D+i UPM

Memorias de investigación
Ponencias en congresos:
Temporal evolution of Townsends attached eddies
Año:2013
Áreas de investigación
  • Turbulencia
Datos
Descripción
The temporal evolution of the eddies responsible for the momentum transfer in a turbulent channel are studied using time-resolved DNS data at Re?=4000. The eddies are identified as connected regions of intense tangential Reynolds stress, and tracked in time. Once their evolutions are properly organized, they provide the necessary information to characterize eddies from birth to death. Eddies are born at all distances from the wall, although with higher probability near it, where the shear is strongest. Most of them stay small and do not last for long times. However, there is a family of eddies that become large enough to get attached to the wall while they reach into the logarithmic layer. They can be considered the best candidates for Townsend's attached eddies found until now. They are geometrically self-similar, with sizes and lifetimes proportional to their distance from the wall. Eddies associated with ejections move away from the wall with dy/dt=u?, and their base attaches very fast at the beginning of their lives. Conversely, sweeps move towards the wall at ?u?, and attach later. In both cases, they remain attached for 2/3 of their lives. In the streamwise direction, eddies are advected and sheared by the local mean velocity.
Internacional
Si
Nombre congreso
66th Annual Meeting of the Division of Fluid Dynamics of the American Physical Society
Tipo de participación
960
Lugar del congreso
Pittsburgh (USA)
Revisores
Si
ISBN o ISSN
0003-0503
DOI
Fecha inicio congreso
24/11/2013
Fecha fin congreso
26/11/2013
Desde la página
234
Hasta la página
234
Título de las actas
Temporal evolution of Townsends attached eddies
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Adrian Lozano Duran (UPM)
  • Autor: Javier Jimenez Sendin (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Mecánica de Fluidos Computacional
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)