A REYNOLDS STRESS CLOSURE DESIGNED FOR COMPLEX GEOMETRIES

The paper describes steps in the development of a low Reynolds number second-moment closure for general flow geometries. This requirement me ans that the model cannot contain geometry-specific quantities, such a s the wall-normal vector or wall distance. In their place, invariant d imensionless ''gradient indicators'' are introduced. New models are al so devised for stress dissipation to capture the very diverse behaviou r of the different components of epsilon(ij) in the wall's vicinity wi th and without shear. A novel decomposition of the fluctuating pressur e terms is also proposed. Applications are shown for shear-free bounda ry regions, plane channel, and stagnation flows.