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Memorias de investigación
Communications at congresses:
Large Reynolds number streak description using RNS
Year:2009
Research Areas
  • Naval engineering
Information
Abstract
|It has been recently shown [Choi, Nature, April 06 - Cossu et al., PRL, February 06] that the inclusion of 3D streaky structures in the boundary layer can make it remain laminar longer than the purely 2D Blasius °ow. We compute the development of 3D streaks in the boundary layer over a °at plate using the so-called Reduced Navier Stokes equations (RNS). The RNS are a boundary layer like formula- tion, which is derived from the Navier-Stokes equations making use of the fact that in the large Re limit two very di®erent spatial scales are present: one long (streamwise direction) and two short (spanwise and wall-normal direction). The resulting RNS are a nonlinear, parabolic, Re independent system that describes the streak structure in the large Re limit. The RNS streak computations are also much more less CPU costly than DNS for high Re, and they don't have the numerical prob- lems that the PSE formulation exhibits (divergence of the results for small ¢x, or blow-up of the solution when the amplitude of the devia- tion from Blasius is not small). In this work we comment the details of the numerical integration of the RNS, and we present some comparisons of the RNS results with the linear computations of streak development together with some fully nonlinear computations of streak evolution.
International
No
Congress
62nd APS Division of Fluid Dynamics Meeting
960
Place
Reviewers
Si
ISBN/ISSN
0003-0503
Start Date
22/09/2009
End Date
24/09/2009
From page
221
To page
221
Large Reynolds number streak description using RNS
Participants
  • Autor: Carlos Martel Escobar (UPM)
  • Autor: Juan Angel Martin Bautista (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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