Nearwall kepsilon turbulence modeling
Abstract
The flow fields from a turbulent channel simulation are used to compute the budgets for the turbulent kinetic energy (k) and its dissipation rate (epsilon). Data from boundary layer simulations are used to analyze the dependence of the eddyviscosity dampingfunction on the Reynolds number and the distance from the wall. The computed budgets are used to test existing nearwall turbulence models of the kepsilon type. It was found that the turbulent transport models should be modified in the vicinity of the wall. It was also found that existing models for the different terms in the epsilonbudget are adequate in the region from the wall, but need modification near the wall. The channel flow is computed using a kepsilon model with an eddyviscosity damping function from the data and no damping functions in the epsilonequation. These computations show that the kprofile can be adequately predicted, but to correctly predict the epsilonprofile, damping functions in the epsilonequation are needed.
 Publication:

6th Symposium on Turbulent Shear Flows
 Pub Date:
 1987
 Bibcode:
 1987stsf.procR..17M
 Keywords:

 Channel Flow;
 Energy Budgets;
 Flow Distribution;
 KEpsilon Turbulence Model;
 Kinetic Energy;
 Mathematical Models;
 NavierStokes Equation;
 Turbulent Flow;
 Dissipation;
 Reynolds Number;
 Viscosity;
 Vortices;
 Fluid Mechanics and Heat Transfer