単体立方体モデル周辺の汚染質拡散を対象としたRANSとLESの比較: CFDによる建物近傍の汚染質拡散の予測精度に関する研究　その2

摘要

The purposes of this study are to confirm the accuracy of LES in modeling plume dispersion near and around a simple building model and to clarify the mechanism of the discrepancy in relation to the RANS computation. Simple LES modeling gives better results than RNG modeling of the distribution of concentration, although the difference for mean velocity is not so large. The horizontal diffusion of concentration is well reproduced by LES. This tendency is closely related to the reproduction of unsteady periodic fluctuation around the cube in LES.%境界層流中の立方体建物モデルの屋額面中央から汚染質が発生すrnる場合の建物表面近傍の汚染質拡散性状に着目して，風洞実験とrnLES，RANSモデルの比較を行った。