Application of a new flow simulation methodology for supersonic axisymmetric wakes

The Flow Simulation Methodology (FSM) is employed to investigate the wake behind axisymmetric bodies with a blunt base at supersonic speeds. The centerpiece of the FSM is a strategy to provide the proper amount of modelling of the subgrid scales. This is accomplished by a "contribution function" which locally and Instantaneously compares the smallest relevant scales to the local grid size. The underlying compressible Navler-Stokes code in cylindrical coordinates employs high-order accurate finite differences and a high-order accurate axis treatment. The code also Incorporates fully three-dimensional transport equations for turbulent kinetic energy and turbulent dissipation including compressible extensions and a state-of-the-art Reynolds stress model. Axisymmetric RANS calculations were performed for wakes at Re _D = 60,000 and M = 2.46, employing both the standard K-ε model (STKE) and an explicit Algebraic Stress Model (EASM_α) in order to evaluate the performance of each. Results of FSM calculations using the EASM_α are compared to DNS results and to steady RANS calculations.