A Study of Repair Processes of Moving Meshes for Store Release Prediction

摘要

Computational Fluid Dynamics (CFD) can be used to accurately predict trajectories of stores released from an aircraft. As a complementary tool to wind tunnel and flight tests, CFD decreases the testing costs by reducing the test matrices required to cover the whole flight envelope. During a CFD prediction of a store release event, the mesh elements surrounding the moving stores are distorted as the stores move to their new positions and orientations. For large amplitude motions, one may have to contend with elements having negative volumes or unacceptable computational quality. This is addressed through remeshing. In order to minimize the diffusion effects introduced by the interpolation of the flow solution onto the new mesh, this remeshing has to be local. This is a mandatory requirement for unsteady computations. An approach, based on Lohner's work, to repair the mesh by eliminating the negative volume elements along with their neighbours is described in this paper. The remeshing process creates holes in the mesh which are remeshed using Delaunay's method. These local meshes are then merged with the original mesh and a new connectivity is generated.