非構造格子による溝つき円柱まわりの流れの数値シミュレーション

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The flow around a cylinder in uniform flow can be observed in many kinds of behavior due to the effects of Reynolds number. In particular, the behavior of the drag force suddenly decreasing at a certain Reynolds number is well known. This phenomena occurs at a point of high Reynolds number, but the same phenomena occurs at a low Reynolds number by putting grooves or roughness on the cylinder surface. This phenomena is applied to the dimples on a golf ball and the grooves on the pipe jumper covering the power line and is very important from the engineering point of view, too. The flying distance of a golf ball is increased by the dimples, and the drag force acting on the line decreases by virtue of the pipe jumper. In this report, the flow around a cylinder with grooves whose section shape is the same as that of a golf ball dimple was analyzed applying the turbulent model with changing Reynolds number. The results were compared to those of a cylinder without grooves through calculation and experiments. The characteristics of this flow was examined. The steady analysis was performed using the universal thermal fluid dynamics software, FLUENT/UNS, using unstructured grid. In these results, the separation points and drag coefficient C_D agreed with the values of experiments. The fact that the drag crisis phenomena of the cylinder with grooves occurs at a lower Reynolds number when compared with the cylinder without grooves was confirmed through calculation, too.
東海大学の論文
1997-03-30

非構造格子による溝つき円柱まわりの流れの数値シミュレーション

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