AM05-03-004 モデル係数のスケール依存性を考慮したdynamicモデルによる複雑地形上大気乱流場のLES(風工学4,一般講演)

概要

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A scale-dependent dynamic Smagorinsky (SDDS) model proposed by Porte-Agel et al. (2000) was introduced into the large-eddy simulation (LES) of a turbulent flow over a two-dimensional steep hill in order to improve the poor accuracy of the scale-invariant dynamic Smagorinsky (DS) model reported in our previous paper (2004). The accuracy was assessed by comparing the results with those from a wind tunnel experiment conducted by Ishihara et al. (1998, 2001), the static Smagorinsky model, and the DS model. On the whole, the SDDS model provided accurate predictions and improved the poor accuracy of the DS model; however, the improvement was somewhat insufficient. Furthermore, the computational cost of the SDDS model was much larger than that of the other two models, mainly due to the cost of solving the polynomial equation for the scale-dependence parameter.
日本流体力学会の論文
2005-09-05