Eddy viscosity models for wakes and separated flows
Abstract
The accuracy of eddyviscositytype models (EVM) in computing turbulentflow parameters is investigated, comparing EVM predictions with experimental data and the predictions of differentialequation models. The flow at the trailing edge of a flat plate and the flow past a backwardfacing step are computed by solving the 2D unsteady compressible NavierStokes equations at Mach 0.4 by a pseudotransient, timesplit finiteelement formulation; the EVM is based on that of Deiwert (1976). The results are presented graphically and discussed. It is found that the EVM describes most features of wake and separated flows satisfactorily, with the exception of the shear stress near the wall downstream from the reattachment (e.g., 0.014 EVM versus 0.011 experimental). This deficiency, however, is also characteristic of twoequation models such as the (kepsilon) model.
 Publication:

AIAA Journal
 Pub Date:
 January 1984
 DOI:
 10.2514/3.48429
 Bibcode:
 1984AIAAJ..22..147S
 Keywords:

 Eddy Viscosity;
 Flow Theory;
 Separated Flow;
 Wakes;
 Backward Facing Steps;
 Flat Plates;
 Flow Velocity;
 KEpsilon Turbulence Model;
 Pressure Distribution;
 Shear Stress;
 Fluid Mechanics and Heat Transfer