2216 格子ボルツマン法における収束性向上に関する研究(G05-3 解析モデルと解析手法,G05 流体工学)  [in Japanese] 2216 Study on improvement of convergence in LBM  [in Japanese]

The present work is an attempt to accelerate the convergence to steady flow solution in the lattice Boltzmann method (LBM). The discrete Boltzmann equation, which had an additional term to avoid the relaxation time from getting too small, was solved implicitly to use a large time step. The proposed method was validated for the cavity flow. The convergence rate was markedly enhanced compared to that of the standard LBM. The present method was also tested for the cylinder flow to investigate its applicability for the unsteady flow. The result of the present method was in good agreement with the experiment.