Memorias de investigación
Artículos en revistas:
Low-dimensional modeling of streaks in a wedge flow boundary layer
Año:2012
Áreas de investigación
  • Dinamica de fluidos
Datos
Descripción
This paper is concerned with the low dimensional structure of optimal streaks in a wedge flow boundary layer, which have been recently shown to consist of a unique (up to a constant factor) three-dimensional streamwise evolving mode, known as the most unstable streaky mode. Optimal streaks exhibit a still unexplored/unexploited approximate self-similarity (not associated with the boundary layer self-similarity), namely the streamwise velocity re-scaled with their maximum remains almost independent of both the spanwise wavenumber and the streamwise coordinate; the remaining two velocity components instead do not satisfy this property. The approximate self-similar behavior is analyzed here and exploited to further simplify the description of optimal streaks. In particular, it is shown that streaks can be approximately described in terms of the streamwise evolution of the scalar amplitudes of just three one-dimensional modes, providing the wall normal profiles of the streamwise velocity and two combinations of the cross flow velocity components; the scalar amplitudes obey a singular system of three ordinary differential equations (involving only two degrees of freedom), which approximates well the streamwise evolution of the general streaks.
Internacional
Si
JCR del ISI
Si
Título de la revista
Physics of Fluid
ISSN
1070-6631
Factor de impacto JCR
1,926
Información de impacto
Volumen
24
DOI
Número de revista
5
Desde la página
053601
Hasta la página
053615
Mes
MAYO
Ranking
Q1 (Mitad superior)
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Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Dinámica y estabilidad no lineal en ingeniería aeroespacial