Validation of an Output-Adaptive, Tetrahedral Cut-Cell Method for Sonic Boom Prediction

摘要

Acut-cell approach to computational fluid dynamics that uses themedian dual of a tetrahedral background grid isndescribed. The discrete adjoint is also calculated for an adaptive method to control error in a specified output. Thenadaptive method is applied to sonic boom prediction by specifying an integral of offbody pressure signature as thenoutput. These predicted signatures are compared to wind-tunnel measurements to validate the method for sonicnboomprediction. Accuratemidfield sonic boompressure signatures are calculated with the Euler equations withoutnthe use of hybrid grid or signature propagation methods. Highly refined, shock-aligned anisotropic grids arenproduced by thismethod fromcoarse isotropic grids created without prior knowledge of shock locations. A heuristicnreconstruction limiter provides stable flow and adjoint solution schemes while producing similar signatures tonBarth–Jespersen and Venkatakrishnan limiters. The use of cut cells with an output-based adaptive schemenautomates the volume grid generation task after a triangular mesh is generated for the cut surface.