Scrutinizing the kepsilon turbulence model under adverse pressure gradient conditions
Abstract
The kepsilon model and a oneequation model have been used to predict adverse pressure gradient boundary layers. While the oneequation model gives generally good results, the kepsilon model reveals systematic discrepancies, e.g., excessively high skin friction coefficients, for these relatively simple flows. These shortcomings are examined and it is shown by an analytical analysis for the loglaw region that the generation term of the epsilonequation has to be increased to conform with experimental evidence under adverse pressure gradient conditions. A corresponding modification to the epsilonequation emphasizing the generation rate due to deceleration was employed in the present investigation and resulted in improved predictions for both moderately and strongly decelerated flows.
 Publication:

ASME Journal of Fluids Engineering
 Pub Date:
 June 1986
 Bibcode:
 1986ATJFE.108..174R
 Keywords:

 Computational Fluid Dynamics;
 KEpsilon Turbulence Model;
 Pressure Gradients;
 Turbulent Boundary Layer;
 Turbulent Flow;
 Deceleration;
 Energy Dissipation;
 Kinetic Energy;
 Mathematical Models;
 Skin Friction;
 Fluid Mechanics and Heat Transfer