Numerical Simulation of Airflow over the New Campus Area of Kyushu University : Part.2 Large-eddy simulation of flow around the buildings

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  • 3次元数値モデルによる九大新キャンパスの風況シミュレーション : 第2報 建物群まわりの風環境予測
  • 3ジゲン スウチ モデル ニ ヨル キュウダイ シン キャンパス ノ フウキョウ シミュレーション ダイ2ホウ タテモノグンマワリ ノ カゼ カンキョウ ヨソク

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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 on 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 based on an orthogonal staggered grid, we have performed the calculations of airflow around buildings. This area covers the new campus of Kyushu University. Airflow characteristics, such as the wind speed-up and the separated flow, were successively simulated.

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