温度成層を伴う乱流境界層におけるLESの予測評価(乱流の予測とモデリング(2),一般講演)

概要

論文の詳細を見る
As for the numerical analysis of a turbulent heat and mass transfer, a DNS (Direct numerical simulation) has been greatly contributing. However, the DNS requires a lot of grid numbers whereby the DNS can only be conducted in low Reynolds and Prandtl number fluids. On the other hand, LES (Large eddy simulation) is the effective calculation technique for an analysis of a turbulent heat and mass transfer, because it uses smaller grid numbers than these of DNS. The object of this study is to evaluate a prediction precision of various SGS models of LES under the simple condition of urban environment, in which various thermally-stratified turbulent boundary layers are calculated by the evaluated LES models. The evaluated LES models for the velocity field are: Smagorinsky model (S model) which is the representative SGS model and the Mixed-Time-Scale model (MTS model) which was developed for engineering applications. For the thermal field, the constant turbulent Prandtl number model (0 equation model) is evaluated. These models are evaluated in comparison with a DNS database, in which problems of LES in the prediction of various thermally-stratified boundary layers are clarified.
日本流体力学会の論文
2008-09-04