Incompressible Recirculating Flows

Summary

The computations from two contributors for high- and low-Reynolds number flow over a backward-facing step are compared and discussed A total of six turbulence models have been used, including wall-function and low-Reynolds-number formulations of two-equation and Reynolds stress models. Baseline computations using the same models, but from different contributors, have shown excellent agreement allowing valuable conclusions to be drawn from the remaining calculations. The reattachment length can only be predicted well by some models, although all models show poor predictions of the redeveloping boundary layer. Overall comparison shows Reynolds stress models provide superior results to two-equation models with low-Reynolds number formulations performing better than the wall function based models.