Numerical prediction for the air environmental improvement of the Asia metropolis, and wind energy effective use

为了模拟复杂地形上的非定常三维气流，特征长度尺度为公里级，我们一直在研究大涡模拟（LES）技术，使用有限差分法（FDM）。这些LES代码被称为RIAM-COMPACTR（九州大学应用力学研究所，复杂地形上气流的计算预测）。在本项目中，我们使用RIAM-COMPACTR软件对真实的城市区域进行了大网格的气流计算。数值结果表明，由于障碍物的影响，气流会局部加速或减速。

In order to simulate 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-COMPACTR(Research Institute for Applied Mechanics, Kyushu University, Computational Prediction of Airflow over Complex Terrain). In this project, using the RIAM-COMPACTR, We have performed the calculation of airflow around real urban area with huge computational grids. The numerical results show that the airflow is locally accelerated or decelerated, due to the obstacle effects.