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本文采用多弛豫时间格子玻尔兹曼方法(multi relaxation time lattice Boltzmann method—MRT LBM)对二维顶盖驱动半圆腔内流动进行了数值模拟,得到了雷诺数为500～50000范围内半圆腔内流场分布情况。在二维顶盖驱动半圆腔流场中,随雷诺数的增大,流场内旋涡的数目逐渐增加,且流动依次呈现出稳定流、周期流、混沌流等状态。本文计算结果表明,MRT-LBM模型可显著提高计算的稳定性,适用于大范围的雷诺数流动情况。
In this paper, the multi-relaxation time lattice Boltzmann method (MRT LBM) is used to simulate the flow in a two-dimensional canopy driven semicircular cavity, and the semicircular cavity with a Reynolds number of 500-50000 Internal flow field distribution. In the two-dimensional cap driven semicircular cavity flow field, the number of vortices in the flow field increases with the increase of Reynolds number, and the flow shows steady state, periodic flow and chaotic flow in turn. The calculation results show that the MRT-LBM model can significantly improve the stability of the calculation and is suitable for a large range of Reynolds number flow.