Assessment of LES Codes for Predicting Local Wind System over Complex Terrain

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  • UCHIDA Takanori
    Research Institute for Applied Mechanics, Kyushu University
  • OHYA Yuji
    Research Institute for Applied Mechanics, Kyushu University

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  • ラージ・エディ・シミュレーションによる局地的風況予測モデルの評価
  • ラージ エディ シミュレーション ニ ヨル キョクチテキフウキョウヨソク モデル ノ ヒョウカ

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Description

In order to develop an overall efficient and accurate model of simulating an unsteady three-dimensional airflow over complex terrain with characteristic length scales of the order of kilometers, we have been examining the large-eddy simulation (LES) technique using a finite-difference method (FDM). The LES codes are based on two grid systems and corresponding variable arrangement: one is an orthogonal staggered grid; the other is a generalized curvilinear collocated grid. Using these codes, we calculated the non-stratified airflow over complex terrain in a horizontal region of 9.5km X 5km with relatively fine spatial resolution（△x＝△ y=50m). Both codes remarkably removed the numerical difficulties such as the convergence of the successive over relaxation (SOR) method in solving the pressure Poisson equation, resulting in the numerical results with much higher accuracy. Despite the differences in the grid system and in the variable arrangement, no significant differences in the flow pattern between the both numerical results were found, and overall characteristic phenomena such as the wind speed-up were successfully simulated.

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