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Modifications of the law of the wall and algebraic turbulence modelling for separated boundary layersVarious modifications of the conventional algebraic eddy viscosity turbulence model are investigated for application to separated flows. Friction velocity is defined in a way that avoids singular behavior at separation and reattachment but reverts to the conventional definition for flows with small pressure gradients. This leads to a modified law of the wall for separated flows. The effect on the calculated flow field of changes in the model that affect the eddy viscosity at various distances from the wall are determined by (1) switching from Prandtl's form to an inner layer formula due to Clauser at various distances from the wall, (2) varying the constant in the Van Driest damping factor, (3) using Clauser's inner layer formula all the way to the wall, and (4) applying a relaxation procedure in the evaluation of the constant in Clauser's inner layer formula. Numerical solutions of the compressible Navier-Stokes equations are used to determine the effects of the modifications. Experimental results from shock-induced separated flows at Mach numbers 2.93 and 8.45 are used for comparison. For these cases improved predictions of wall pressure distribution and positions of separation and reattachment are obtained from the relaxation version of the Clauser inner layer eddy viscosity formula.
Document ID
19760054036
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Baldwin, B. S.
(NASA Ames Research Center Moffett Field, CA, United States)
Maccormack, R. W.
(NASA Ames Research Center Moffett Field, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
July 1, 1976
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 76-350
Meeting Information
Meeting: Fluid and Plasma Dynamics Conference
Location: San Diego, CA
Start Date: July 14, 1976
End Date: July 16, 1976
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
76A37002
Distribution Limits
Public
Copyright
Other

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