Near-wall k-E turbulence modeling

The flowfields from a turbulent channel simulation are used to compute the budgets for the turbulence kinetic energy (&) and its dissipation rate e. Data from boundary-layer simulations are used to analyze the dependence of the eddy-viscosity damping function on the Reynolds number and the distance from the wall. The computed budgets are used to test existing near-wall turbulence models of the k-e type. We find that the turbulent transport models should be modified in the vicinity of the wall. We also find that existing models for the different terms in the e-budget are adequate in the region away from the wall but need modification near the wall. Our results indicate that in the context of k-e modeling ad hoc eddy-viscosity damping functions play an important role in predicting the kinetic energy profile.