壁面減衰関数を必要としない静的SGSモデルの適用とその最適化の一方策 : 複雑地形上流れのLES(その2)

概要

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The performance of the new static sub-grid scale (SGS) model proposed by Inagaki et al. (2002) and its modifications was examined in the large eddy simulation (LES) of the turbulent flow over a two-dimensional steep hill. The prediction accuracy of the SGS models introduced in this study was assessed by comparing the results with those from an experiment by Ishihara et al. (2001) and the standard Smagorinsky model. The modified model, in which the expression of the square of the velocity scale was changed from the SGS Reynolds stress modeled by the scale-similarity concept into the modified Leonard term, provided very accurate predictions and produced the best results of the three models compared here. On the other hand, the original Inagaki model showed less accuracy, mainly due to the insufficient prediction accuracy near the ground surface of the approach flow.
社団法人日本建築学会の論文
2004-02-28