Parallel Compressible Viscous Flow Simulations Using FLASH Code: Implementation for Arbitrary 3D Geometries

We implement computer graphics algorithms in the FLASH code to enable compressible high-speed flow simulation past any arbitrary two- and three-dimensional stationary bodies. The body shape is represented in a block-structured Cartesian adaptive mesh refinement grid. A high level of refinement is required to represent the body shape accurately and also resolve flow and shock features, resulting in very large grid sizes for 3D simulations. Simulations are done in parallel on IBM Blue Gene/Q computing system on which scalability of the code is also assessed. We also implement appropriate wall boundary conditions in FLASH to model viscous-wall effects. Navier- Stokes solutions for real applications like hypersonic flow control using micro vortex generators and flow past blunted cone-cylinder-flare geometry are shown.