A numerical study of turbulent flows in backwardfacing step geometries: A comparison of 4 models of turbulence
Abstract
A numerical study of two dimensional separating and reattaching turbulent flows in plane backward facing step geometries with parallel and deflected walls. Closure of the Reynolds equations was achieved by four different models: kappaepsilon modified kappaepsilon algebraic stress and modified algebraic stress models. The kappaepsilon model relates the Reynolds stresses to the mean rate of strain through the definition of an isotropic turbulent viscosity, whereas the more advanced algebraic stress model calculates the stresses from implicit algebraic relationships containing the stresses themselves, the mean rate of strain, and the turbulent kinetic energy and its dissipation rate. Modified versions of the models employ a new dissipation rate equation whose production term was made more sensitive to streamwise curvature effects. A new nonequilibrium wall function treatment was also incorporated into each model.
 Publication:

Ph.D. Thesis
 Pub Date:
 1982
 Bibcode:
 1982PhDT........36S
 Keywords:

 Computer Programs;
 Geometry;
 Kinetic Energy;
 Numerical Analysis;
 Strain Rate;
 Stress Analysis;
 Turbulence Models;
 Two Dimensional Flow;
 KEpsilon Turbulence Model;
 Performance Tests;
 Pressure Effects;
 Reynolds Number;
 Step Functions;
 Time Dependence;
 Turbulent Boundary Layer;
 Viscosity;
 Fluid Mechanics and Heat Transfer