A NEW LOW-REYNOLDS-NUMBER K-E-F(MU) MODEL FOR PREDICTIONS INVOLVING MULTIPLE SURFACES

A new k-epsilon-f(mu) turbulence model is proposed, in which the near- wall effect without reference to distance and the nonequilibrium effec t are incorporated. Ln this model, the non-local near-wall effect in a general coordinate system is taken into account by the f(mu) equation , and the local anisotropy in strongly strained turbulent flows is int roduced in the epsilon equation. The near-wall characteristics of the present model are ascertained from the DNS data. Also, the validation is explored to separate and reattaching flows. The backward-facing ste p flow is selected for benchmark test of the present model and the res ponse of the model to flows involving complex surfaces is assessed. Th e predictions of the present model are checked with the existing measu rements. The model performance is shown to be generally satisfactory.