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Memorias de investigación
Research Publications in journals:
Low-dimensional modeling of streaks in a wedge flow boundary layer
Year:2012
Research Areas
  • Fluyd dynamics
Information
Abstract
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.
International
Si
JCR
Si
Title
Physics of Fluid
ISBN
1070-6631
Impact factor JCR
1,926
Impact info
Volume
24
Journal number
5
From page
053601
To page
053615
Month
MAYO
Ranking
Q1 (Mitad superior)
Participants
  • Autor: Maria Jesus Higuera Torron (UPM)
  • Autor: Jose Manuel Vega De Prada (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Dinámica y estabilidad no lineal en ingeniería aeroespacial
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