Dynamic SGSモデルの問題点とハイブリッドモデルの適用 : 複雑地形上流れのLES(その1)

概要

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Turbulent flow over a two-dimensional steep hill was analyzed by large eddy simulations (LES). Here, six LES computations were carried out using four different sub-grid scale (SGS) models and two different ground surface boundary conditions. The accuracy of these computations was assessed by comparing the results with those from an experiment by Meng et al. (1998). The results of the dynamic SGS models showed very poor agreement with the experiment, mainly due to the poor prediction accuracy in the vicinity of the ground surface. Therefore, a hybrid SGS mode, i.e., a combination of the standard Smagorinsky model and the dynamic SGS model, was introduced. In the hybrid model, the standard Smagorinsky model was applied only in the vicinity of the ground surface, and the dynamic SGS model was applied in the other region. The hybrid model provided very accurate predictions and produced the best results of the four SGS models.
社団法人日本建築学会の論文
2003-06-30