关键词: 并行计算, 结构网格, 数值模拟

Abstract: Based on NNW-FSI, a Fluid-Structure Interaction simulation software platform for National Numerical Wind tunnel systems, several key methods for ultra-large-scale CFD parallelization are systematically proposed in this paper, including the grid reconstruction method for generating ultra-large-scale structured grid, the method for searching wall distance based on multigrid coarsening technology, the algorithm for searching contribution unit in overset grid, and the algorithm for searching cross unit in patched grid. Meanwhile, the pre-grid generation module, flow field solving module and post-display module for CFD numerical simulation of ultra-large-scale structured grid are de-veloped on the supercomputers with different architectures. For the implementation of parallelization, pure MPI and MPI+OpenMP hybrid parallel methods based on homogeneous platforms are used, and MPI+OpenACC hybrid parallel methods based on heterogeneous platforms are used. Using these methods, the ultra-large-scale CFD numerical simulation is realized and achieves good parallel efficiency on different domestic supercomputers, and the largest scale has tens of billions of grids running on millions of CPU cores parallelly. The numerical results show that the proposed method achieves good grid convergence, multi-core consistency and high-precision results, which lays a good foundation for the next workhe text of English abstracts.

Key words: parallel computing, structured grid, numerical simulation