Abstract
A third-order nonlinear K-ε model proposed by the authors is applied to turbulent flow through an asymmetric diffuser including separation and reattachment. The numerical results show that the nonlinear model predicts profiles of the turbulent quantities better than a representative linear eddy-viscosity model but does not reproduce the flow separation. The model is improved by incorporating a strain-convection effect derived from a theoretical analysis into the Reynolds stress to capture separation and reattachment.
