Direct simulation of flow field around SUBOFF in grid-generated turbulence with SWLBM

SWLBM is a Lattice Boltzmann Method (LBM) based software designed running on Sunway TaihuLight Supercomputer. In this paper, we introduce the simulation of flow over DARPA SUBOFF model in grid-generated turbulence with SWLBM. The simulation setting follows the Particle Image Velocimetry (PIV) measurement experiment done in the water tunnel of Beijing University of Aeronautics and Astronautics (BUAA) with a low speed of 0.25 m/s. The turbulent flow generated from a grid formed by 36 mm square mesh interlocking with 6 mm square bars was simulated directly, and the evolution of turbulence transition over the forebody surface of a scaled-down SUBOFF model with diameter of 200 mm was captured. The simulation results including velocity field and statistical variables were compared relatively well with experimental data. The simulation case has lattice size of 7.8billions and could finish 200,000 iterations within 24 h running on 2000 core groups of Sunway Taihulight supercomputer. This shows SWLBM is efficient tool for high resolution simulation for turbulent study.