Extrusion of Complex Surface Meshes Utilizing Face Offsetting and Mean Curvature Smoothing

McCloud, Peter L

关键词: GRID GENERATION (MATHEMATICS);    COMPUTATIONAL FLUID DYNAMICS;    THREE DIMENSIONAL MODELS;    CURVATURE;    SURFACE DISTORTION;    SMOOTHING;    EXTRUDING;    COMPUTATIONAL GRIDS;    COMPUTERIZED SIMULATION;    THERMAL PROTECTION;    ALGORITHMS;    DIMENSIONAL ANALYSIS;    THICKNESS;    BOUNDARY LAYERS;   

RP-ID  :  JSC-E-DAA-TN63010

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Grids for three-dimensional Computational Fluid Dynamics problems frequently require a prismatic layer of cells, typically extruded in the off-body direction from a two-dimensional surface mesh to properly resolve boundary layers. When the surface geometry is complex, the extrusion process can fail, resulting in the physical boundary layer being thicker than the prismatic layer, leading to under-resolved boundary layers. To address the shortcomings of existing grid generation tools, a new tool has been developed as part of the Mesh Tools suite, that is capable of extruding complex surface meshes. The new tool uses a face offsetting method to preserve surface curvature and a mean curvature smoothing algorithm to prevent the cells from self-intersecting in concave regions. Testing of the new tool found that not only were complex surface meshes able to be extruded to the desired thickness, but extrusion of simple surface meshes was also improved, due to the face offsetting method.