RANS Capability for 3 - D Shock Wave - Boundary Layer Interactions Quantity Current RANS Capability

We present an algorithm for compressible Large Eddy Simulation (LES) using unstructured tetrahe-dral grids. Two methods for simulation of the sub-grid scale stresses are examined. The rst method is the Monotone Integrated Large Eddy Simulation (MILES) technique of Boris, Oran and Grinstein, whereby the energy transfer from the resolved scales to the subgrid scales is modeled using the inherent dissipation of the numerical algorithm. The second method is a hybrid technique combining MILES with a Smagorinsky eddy viscosity model for the subgrid scale stresses. The inviscid uxes are determined by Godunov's second method or Roe's method. Two different second-order accurate function reconstruction techniques have been evaluated. The subgrid scale stresses are computed using a second-order accurate method based on Gauss' theorem. A second-order Runge-Kutta method is employed for the temporal integration. Simulation of the decay of incompress-ible isotropic turbulence has been performed for two dierent grids. Good agreement is obtained with the experimental data of Comte-Bellot and Corrsin for the decay of turbulence energy, and reasonable agreement with the temporal evolution of the energy spectrum. A parallel version of the code using MPI has been developed and validated.