A simplified ν2-f model for near-wall turbulence

A simplified version of the nu(2)-f model is proposed that accounts for the distinct effects of low-Reynolds number and near-wall turbulence. It incorporates modified C-epsilon(1,2) coefficients to amplify the level of dissipation in non-equilibrium flow regions, thus reducing the kinetic energy and length scale magnitudes to improve prediction of adverse pressure gradient flows, involving flow separation and reattachment. Unlike the conventional nu(2)-f, it requires one additional equation (i.e. the elliptic equation for the elliptic relaxation parameter f(mu)) to be solved in conjunction with the k-epsilon model. The (nu) over bar (2) scaling is evaluated from k in collaboration with an anisotropic coefficient C, and f(mu), Consequently, the model needs no boundary condition on (nu) over bar (2) and avoids free stream sensitivity. The model is validated against a few flow cases, yielding predictions in good agreement with the direct numerical simulation (DNS) and experimental data. Copyright (c) 2007 John Wiley & Sons, Ltd.