Automated Massively Refinement Technique for Multi-block Structured Grids Based on NURBS Volume
Hiroshi Koizumi, Seiji Tsutsumi, Ryoji Takaki, Kazuomi Yamamoto, Hiroyuki Ito, Masaharu Abe, Yosuke Matsumura · 22nd AIAA Computational Fluid Dynamics Conference · 2015
An automated mesh refinement technique for body-fitted multiblock structured grids used in computational fluid dynamics (CFD) simulation has been developed. The present technique reads a baseline mesh with tens of millions of cells generated by conventional software with a graphical user interface (GUI) and can refine up to tens of billions of grid points. Each grid block is refined based on the non-uniform rational B-spline (NURBS) volume; therefore, a body with curvature, such as airfoil, can be refined without reading geometrical data for the body. This tool is capable of retaining the initial grid spacing of the first cell at the boundary layer on the wall and that of the far-field boundary through the mesh refinement process. This tool was parallelized using message passing interface (MPI), and a mesh with 8.2 billion points was generated for an aeroacoustic computation from a baseline mesh with 30 million of points within 4 min using 288 cores of a PC cluster.