Parallel computation of complex aeroacoustic systems

The ability of high-order compact differencing and filtering schemes to compute realistic aeroacoustic situations is examined. The strong conservation form of the Euler equations are employed in a curvilinear coordinate system with particular emphasis on recently developed procedures which minimize freestream preservation errors. A powerful filter-based absorbing boundary condition is also utilized. Time-integration was achieved with either the fourth-order classical R-K method or with a third-order, iterative, approximate-factorization implicit scheme. The algorithm is formulated for use on massively parallel platforms, with specific focus on the SGI Origin 2100 computer. Several canonical problems have been solved to establish the accuracy of the overall implementation. These include propagation of a spherical pulse and scattering from a cylinder. Finally, a prehrninary analysis has been conducted of acoustic scattering from a generic aerospace vehicle configuration. These calculations, which employ a domain-decomposition approach, demonstrate that the various components of the scheme are suitable for use on realistic geometries, particularly when executed on parallel machines.