孝紀 内田

Reproducibility of Complex Turbulent Flow Using Commercially-Available CFD Software : Report 2: For the Case of a Two-Dimensional Ridge With Steep Slopes

Choosing appropriate sites for wind turbines is extremely important in Japan because the spatial distribution of wind speed is highly complex over steep complex terrain, which is abundant in Japan. The authors research group has been developing an unsteady CFD software package called RIAM-COMPACT®. This package is based on an LES turbulence model. In this paper, to examine the accuracy of RIAM-COMPACT®, numerical simulations of uniform, non-stratified airflow over a two-dimensional ridge were performed. The analysis primarily focused on airflow characteristics in the wake region. The results from the simulation with RIAM-COMPACT® were compared to those from a commercially-available CFD software package (STAR-CCM+), and no significant differences were found among these results.

PCクラスタを用いた風況予測シミュレータRIAM-COMPACTの開発 : その2.スカラー並列計算機における経過時間の比較

We are developing the numerical model called the RIAM-COMPACT (Research Institute for Applied Mechanics, Kyushu University, Computational Prediction of Airflow over Complex Terrain). The object domain of this numerical model is from several m to several km, and can predict the airflow over complex terrain with high precision. Since we put this numerical model in practical use, we are considering introduction of a PC cluster and a SMP cluster. We have already showed the comparison of the elapsed time in various computers as the first step. In this paper, we have examined the elapsed time in scalar parallel computers, such as a PC cluster and a SMP cluster, by using a MPI (Message Passing Interface), as the second step. Consequently, it became clear that the newest small scalar parallel computers have about the same performance as a vector supercomputer.