A Non-body Conformal Grid Method for Simulation of Compressible Flows with Complex Immersed Boundaries

A compressible non-body conformal grid method is presented. The method is designed to simulate a large variety of subsonic compressible flows with complex geometries. A hybrid implicit-explicit timediscretization scheme is chosen. The diagonal viscous terms are treated implicitly and all other terms including the convective terms and cross-terms are treated explicitly using a low-storage, 3-Order RungeKutta scheme. A mixed second-order central difference-QUICK scheme has been used which allows us to precisely control the numerical damping. A ghostcell approach is employed in conjunction with a bilinear interpolation scheme so as to satisfy the boundary conditions on the immersed boundaries while preserving second-order accuracy. Numerical results are validated by comparing against experimental data and other established simulation results.