Surface Mesh Movement for Aerodynamic Design of Body-Installation Junction

摘要

A surface mesh movement method was developed for practical modification of geometries with body-installation junctions. We moved the surface mesh points directly on the facet surfaces using a spring analogy. The initial mesh is used as the background mesh. New mesh locations are projected onto the initial smooth surface by a surface recovery method. This method does not require any parameterization or geometry representations other than the faceted surface mesh. Neither does it require time-consuming remeshing processes. It allows efficient and robust mesh movement for modified geometries of wing-body configurations including the junction region, which is essential for aerodynamic design of complex configurations such as an entire aircraft. For mild modifications usually encountered in aerodynamic shape optimizations, this method is robust as shown by the examples herein presented. If the geometric variations are so large that simple surface mesh movement causes highly stretched cells, mesh point insertion/deletion and local remeshing for mesh quality control can additionally be conducted. The present method does not work if a large amount of geometric modification causes removal or topological change of the junctiori lines. The present procedure can also be applied to wing-body junctions with fairings as long as junction lines having gradient discontinuities can be defined. In the present study, this new method was applied to ONERA M5 wing-body and DLR F6 wing-body-nacelle-pylon configurations with somewhat large geometric modifications. Results indicate that the present method is very efficient and effective for practical aerodynamic shape design of complex aerodynamic configurations with junctions.