Department of Computer Science
A parallel lattice Boltzmann method for large eddy simulation on multiple GPUs
To improve the simulation efficiency of turbulent fluid flows at high Reynolds numbers with large eddy dynamics, a CUDA-based simulation solution of lattice Boltzmann method for large eddy simulation (LES) using multiple graphics processing units (GPUs) is proposed. Our solution adopts the "collision after propagation" lattice evolutionway and puts the misaligned propagation phase at global memory read process. The latest GPU platform allows a single CPU thread to control up to four GPUs that run in parallel. In order to make use of multiple GPUs, the whole working set is evenly partitioned into sub-domains. We implement Smagorinsky model and Vreman model respectively to verify our multi-GPU solution. These two LES models have different relaxation time calculation behavior and lead to different CUDA implementation characteristics. The implementation based on Smagorinsky model achieves 190 times speedup over the sequential implementation on CPU,while the implementation based on Vreman model archives more than 90 times speedup. The experimental results show that the parallel performance of our multi-GPU solution scales very well on multiple GPUs. Therefore large-scale (up to 10,240 × 10,240 lattices) LES-LBM simulation becomes possible at a low cost, even using double-precision floating point calculation. © Springer-Verlag Wien 2014.
CUDA, GPU Computing, Large eddy simulation, Lattice Boltzmann method
Source Publication Title
Li, Qinjian, Chengwen Zhong, Kai Li, Guangyong Zhang, Xiaowei Lu, Qing Zhang, Kaiyong Zhao, and Xiaowen Chu. "A parallel lattice Boltzmann method for large eddy simulation on multiple GPUs." Computing 96.6 (2014): 479-501.