Contribution towards the second-moment closure modelling of separating turbulent flows (Q1129603)

We analyze numerically six cases of turbulent flows over backward-facing steps and in sudden plane and axisymmetric expansions in a range of Reynolds numbers, using two variants of high-Re number second-moment closures and a new model which accounts separately for low-Re number, wall blockage and pressure reflection effects, thus allowing integration up to the wall. Attention was focused on a back-step flow at a step-height Reynolds number of 5000, for which detailed experimental data are available.