导航

Acta Aeronautica et Astronautica Sinica ›› 2024, Vol. 45 ›› Issue (20): 129866.doi: 10.7527/S1000-6893.2024.29866

• Fluid Mechanics and Flight Mechanics • Previous Articles    

A pilot study on CFD numerical simulation of ultra-large-scale structured grid

Junwu HONG, Wei LI, Hao YUE(), Dehong MENG, Yan SUN   

  1. Computational Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China
  • Received:2023-11-13 Revised:2024-02-28 Accepted:2024-03-11 Online:2024-04-25 Published:2024-04-19
  • Contact: Hao YUE E-mail:haoeryue15@163.com
  • Supported by:
    National Key Research and Development Program of China(2020YFB1506701)

Abstract:

Based on NNW-FSI, a Fluid-Structure Interaction (FSI) simulation software platform for National Numerical Windtunnel (NNW) 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 the multigrid coarsening technology, the algorithm for searching contribution unit in overset grid, and the algorithm for searching cross unit in the patched grid. Meanwhile, the pre-grid generation module, flow field solving module and post-display module for CFD numerical simulation of the ultra-large-scale structured grid are developed based 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, 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-step work.

Key words: CFD, parallel computing, structured grid, multi-grid, NNW-FSI

CLC Number: