格子ボルッマン法に基づいた等温室内気流のラーシ·エディ·シミュレーション

摘要

In recent years, Lattice Boltzmann method (LBM) ， has been applied in built wind simulation. In this study, LBM assembled with large-eddy simulation (LBM-LES) were employed, as well as the finite volume method (FVM-LES) ， to simulate an indoor isothermal forced convection case, aiming to verify the prediction accuracy of LBM-LES method, and to compare their results accuracy and computational speeds. The result shows that LBM-LES method can acquire FVM-LES' precision in predicting indoor turbulent flow, however it required finer meshes. In the aspect of computational speed, LBM-LES expressed better parallel computational efficiency, especially when using more computational cores, the computational speed of LBM-LES became larger than that of FVM-LES in the case of the same results accuracy.%近年，格子ボルツマン法（Lattice Boltzmann Method, LBM)を用いた建築風環境解析例が報告されている.本解説では，等温室内流れを対象として，Large-eddy simulationが組み込まれたLBM(LBM-LES)および有限体積法(FVM-LES)を用いた解析を実施し，LBM-LESの予測精度の検証，及び両手法の結果精度と計算速度の比較を行つた.結果としては，室内気流解析においてLBM-LESがFVM-LESと同様な予測精度を与えられる力气FVM-LES より高い格子解像度が必要である.計算速度の方は，LBM-LESがより優れた並列計算効率が表現し，特により多くの計算コアを使用すると同じ解析精度の場合にFVM-LESより大きい計算速度を与えた.