Memorias de investigación
Artículos en revistas:
Modal Description of Internal Optimal streaks
Año:2009
Áreas de investigación
  • Mecánica de fluidos
Datos
Descripción
This paper deals with the definition and description of optimal, streaky (S) perturbations in a Blasius boundary layer. First, the asymptotic behaviors of S-perturbations near the free stream and the leading edge are studied, to conclude that the former is slaved to the solution inside the boundary layer. Based on these results, a quite precise numerical scheme is constructed that allows concluding that S-perturbations produced inside the boundary layer, near the leading edge, can be defined in terms of just one streamwise-evolving solution of the linearized equations, associated with the first eigenmode of an eigenvalue problem first formulated by Luchini (1996). Such solution may be seen as an {\it internal, unstable streaky mode} of the boundary layer, similar to eigenmodes of linearized stability problems. The remaining modes decay streamwise. Thus, the definition of streaks in terms of an optimization problem that is used nowadays is not necessary.
Internacional
Si
JCR del ISI
Si
Título de la revista
JOURNAL OF FLUID MECHANICS
ISSN
0022-1120
Factor de impacto JCR
2,315
Información de impacto
Volumen
626
DOI
10.1017/S0022112009006284
Número de revista
0
Desde la página
21
Hasta la página
32
Mes
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Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Dinámica y estabilidad no lineal en ingeniería aeroespacial
  • Departamento: Fundamentos Matemáticos de la Tecnología Aeronáutica