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Role of pressure diffusion in non-homogeneous shear flowsA non-local model is presented for approximating the pressure diffusion in calculations of turbulent free shear and boundary layer flows. It is based on the solution of an elliptic relaxation equation which enables local diffusion sources to be distributed over lengths of the order of the integral scale. The pressure diffusion model was implemented in a boundary layer code within the framework of turbulence models based on both the kappa-epsilon-(bar)upsilon(exp 2) system of equations and the full Reynolds stress equations. Model computations were performed for mixing layers and boundary layer flows. In each case, the pressure diffusion model enabled the well-known free-stream edge singularity problem to be eliminated. There was little effect on near-wall properties. Computed results agreed very well with experimental and DNS data for the mean flow velocity, the turbulent kinetic energy, and the skin-friction coefficient.
Document ID
19950014636
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Demuren, A. O. (Old Dominion Univ. Hampton, VA, United States)
Lele, S. K. (Stanford Univ. CA., United States)
Durbin, P. (Stanford Univ. CA., United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1994
Publication Information
Publication: Stanford Univ., Studying Turbulence Using Numerical Simulation Databases. 5: Proceedings of the 1994 Summer Program
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
95N21053
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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