Calculation of curved shear layers with two-equation turbulence models

Three extensions of the k-epsilon turbulence model were tested for shear-layer flows with streamline curvature. The first version is an algebraic stress model which was derived by simplification of modeled Reynolds stress equations and does not contain curvature-specific empiricism. The other two versions use modified form of the dissipation rate equation. The test cases considered are a convexly curved boundary layer, a curved mixing layer and wall jets on logarithmic spiral surfaces. The results show that the algebraic stress model gives the best overall agreement in the curved part of the flow but predicts too fast a recovery after the removal of curvature.