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Memorias de investigación
Research Publications in journals:
Modal Description of Internal Optimal streaks
Year:2009
Research Areas
  • Fluid mechanics
Information
Abstract
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.
International
Si
JCR
Si
Title
JOURNAL OF FLUID MECHANICS
ISBN
0022-1120
Impact factor JCR
2,315
Impact info
Volume
626
10.1017/S0022112009006284
Journal number
0
From page
21
To page
32
Month
ENERO
Ranking
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
  • Departamento: Fundamentos Matemáticos de la Tecnología Aeronáutica
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