A comparative study of computational solutions to flow over a backwardfacing step
Abstract
A comparative study was conducted for computational fluid dynamic solutions to flow over a backwardfacing step. This flow is a benchmark problem, with a simple geometry, but involves complicated flow physics such as free shear layers, reattaching flow, recirculation, and high turbulence intensities. Three Reynoldsaveraged NavierStokes flow solvers with kepsilon turbulence models were used, each using a different solution algorithm: finite difference, finite element, and hybrid finite element  finite difference. Comparisons were made with existing experimental data. Results showed that velocity profiles and reattachment lengths were predicted reasonably well by all three methods, while the skin friction coefficients were more difficult to predict accurately. It was noted that, in general, selecting an appropriate solver for each problem to be considered is important.
 Publication:

In its The Fifth Annual Thermal and Fluids Analysis Workshop p 523530 (SEE N9423634 0634
 Pub Date:
 November 1993
 Bibcode:
 1993tfa..work..523M
 Keywords:

 Algorithms;
 Backward Facing Steps;
 Computational Fluid Dynamics;
 Finite Difference Theory;
 Finite Element Method;
 KEpsilon Turbulence Model;
 NavierStokes Equation;
 Reattached Flow;
 Recirculative Fluid Flow;
 Turbulent Flow;
 Coefficient Of Friction;
 Reynolds Equation;
 Shear Layers;
 Shear Stress;
 Skin Friction;
 Turbulence;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer