Tranversal motion and flow structure of fully nonlinear streaks in a laminar boundary layer

Martín Bautista, Juan A. and Martel Escobar, Carlos (2011). Tranversal motion and flow structure of fully nonlinear streaks in a laminar boundary layer. In: "64th Annual Meeting of the APS Division of Fluid Dynamics", 20/11/2011 - 22/11/2011, Baltimore, Maryland, EEUU. p. 330.

Description

Title: Tranversal motion and flow structure of fully nonlinear streaks in a laminar boundary layer
Author/s:
  • Martín Bautista, Juan A.
  • Martel Escobar, Carlos
Item Type: Presentation at Congress or Conference (Article)
Event Title: 64th Annual Meeting of the APS Division of Fluid Dynamics
Event Dates: 20/11/2011 - 22/11/2011
Event Location: Baltimore, Maryland, EEUU
Title of Book: Bulletin of the American Phisical Society. 64th Annual Meeting of the APS Division of Fluid Dynamics
Date: 2011
Volume: 56, Is
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Fundamentos Matemáticos de la Tecnología Aeronáutica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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 $Re \gg 1$, it requires much less computational effort 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 effects 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.

More information

Item ID: 12923
DC Identifier: http://oa.upm.es/12923/
OAI Identifier: oai:oa.upm.es:12923
Official URL: http://meetings.aps.org/link/BAPS.2011.DFD.M20.5
Deposited by: Memoria Investigacion
Deposited on: 12 Dec 2012 16:52
Last Modified: 21 Apr 2016 12:15
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