Variable Turbulent Schmidt and Prandtl Number Modeling

This paper describes variable turbulent Schmidt and Prandtl number formulations, based on Rodi's (1980) algebraic Reynolds stress model adapted to velocity-scalar correlations. Since the approach is algebraic in nature, it does not introduce transport equations beyond the ones already existing to compute the flow, rendering it a viable engineering tool. The method is scrutinized against several test cases, including a 3D Scramjet combustor problem. Results are encouraging and lend confidence in the proposed approach.