Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Tranversal motion and flow structure of fully nonlinear streaks in a laminar boundary layer
Year:2011
Research Areas
  • Fluid mechanics,
  • Aeronautical engineering
Information
Abstract
Typical streak computations present in the literature correspond to linear streaks or to small amplitude nonlinear streaks computed using DNS or nonlinear PSE. We use the Reduced Navier-Stokes (RNS) equations to compute the streamwise evolution of fully non-linear streaks with high amplitude in a laminar flat plate boundary layer. The RNS formulation provides Reynolds number independent solutions that are asymptotically exact in the limit Re>>1, it requires much less computational e®ort than DNS, and it does not have the consistency and convergence problems of the PSE. We present various streak computations to show that the flow configuration changes substantially when the amplitude of the streaks grows and the nonlinear e®ects come into play. The transversal motion (in the wall normal-streamwise plane) becomes more important and strongly distorts the streamwise velocity profiles, that end up being quite different from those of the linear case. We analyze in detail the resulting flow patterns for the nonlinearly saturated streaks and compare them with available experimental results.
International
Si
Congress
6th ERCOFTAC Iberian West PC
960
Place
Vigo, Pontevedra, España.
Reviewers
Si
ISBN/ISSN
sin ISBN
Start Date
07/10/2011
End Date
07/10/2011
From page
22
To page
22
Bulletin of ERCOFTAC iberian West PC
Participants
  • Autor: Juan Angel Martin Bautista (UPM)
  • Autor: Carlos Martel Escobar (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
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)