Direct Numerical Simulation of the Wall-Bounded Turbulent Flow by Lattice Boltzmann Method Based on Multi-GPU

XU Ding; CHEN Gang; WANG Xian; LI Yue-ming

doi:10.3879/j.issn.1000-0887.2013.09.009

Volume 34 Issue 9

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XU Ding, CHEN Gang, WANG Xian, LI Yue-ming. Direct Numerical Simulation of the Wall-Bounded Turbulent Flow by Lattice Boltzmann Method Based on Multi-GPU[J]. Applied Mathematics and Mechanics, 2013, 34(9): 956-964. doi: 10.3879/j.issn.1000-0887.2013.09.009

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Direct Numerical Simulation of the Wall-Bounded Turbulent Flow by Lattice Boltzmann Method Based on Multi-GPU

doi: 10.3879/j.issn.1000-0887.2013.09.009

State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, P.R.China

Funds: The National Natural Science Foundation of China（11242010；11102150）

Received Date: 2013-05-30
Rev Recd Date: 2013-06-05
Publish Date: 2013-09-15

Abstract

Abstract

The wallbounded turbulent flow was simulated directly (DNS) by lattice Boltzmann method (LBM) through multi-GPU parallel computing. The Data-parallel SIMT (single-instruction multiple-thread) characteristic of GPU matched the parallelism of LBM well, which led to high efficiency of GPU on the LBM solver. At the same time, it bronght possibility for large-scale DNS on the desk-top supercomputer. In this DNS work, 8 GPUs were adopted. The number of meshes is 6.7×10⁷, which resulted in a non-dimensional mesh size of Δ⁺=1.41 for the whole solution domain. It took only 24 hours for the GPU-LBM solver to simulate 3×10⁶ LBM steps. As a result, both the mean velocity and turbulent variables, such as Reynolds stress and velocity fluctuations, agree well with the results of Moser, et al. The capacity and validity of LBM in simulating turbulent flow are verified.
- lattice Boltzmann method,
- multi-GPU parallel computing,
- wall-bounded turbulent flow,
- DNS

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References(19)

References

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