G331 ネストグリッドを用いた局地風況場の数値シミュレーション

概要

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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). These LES codes are referred to as the RIAM-COMPACT (Research Institute for Applied Mechanics, Kyushu University, Computational Prediction of Airflow over Complex Terrain), and are based on two grid systems and corresponding variable arrangement : one is an orthogonal staggered grid; the other is a generalized curvilinear collocated grid. In this paper, using the RIAM-COMPACT with a generalized curvilinear collocated grid, we have performed the calculations of a non-stratified airflow over real complex terrain by introducing the nested grid system (△x=△y=25m). This area covers the new campus of Kyushu University. Compared with the wind tunnel experiment, the numerical results show that the airflow is locally accelerated or decelerated due to the topographic effects.
日本流体力学会の論文
2001-07-31