A kepsilon modeling of near wall turbulence
Abstract
A kepsilon model is proposed for turbulent bounded flows. In this model, the turbulent velocity scale and turbulent time scale are used to define the eddy viscosity. The time scale is shown to be bounded from below by the Kolmogorov time scale. The dissipation equation is reformulated using the time scale, removing the need to introduce the pseudodissipation. A damping function is chosen such that the shear stress satisfies the near wall asymptotic behavior. The model constants used are the same as the model constants in the commonly used high turbulent Reynolds number kepsilon model. Fully developed turbulent channel flows and turbulent boundary layer flows over a flat plate at various Reynolds numbers are used to validate the model. The model predictions were found to be in good agreement with the direct numerical simulation data.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 September 1991
 Bibcode:
 1991STIN...9132460Y
 Keywords:

 Asymptotic Methods;
 Channel Flow;
 Flat Plates;
 Fluid Dynamics;
 KEpsilon Turbulence Model;
 Turbulent Boundary Layer;
 Turbulent Flow;
 Walls;
 Damping;
 Dissipation;
 Eddy Viscosity;
 High Reynolds Number;
 Reynolds Number;
 Shear Stress;
 Fluid Mechanics and Heat Transfer