物体表面ディンプル効果の検証における二次元CFD解析の活用法の検討

抄録

Dimples on the surface of a golf ball are one example of a superior technique for reducing drag from flow. In this study, multiple grooves were processed on the back of the wing model, and the drag reduction effect was verified by wind tunnel experiments and two-dimensional CFD analysis. Experimental results confirmed a significant drag reduction effect. In addition, it was found that the value of the angle of attack that generates the maximum lift is shifted to the high angle of attack side by about 5° compared to the non-machined wing. In the CFD analysis, three representative turbulence models were used to reproduce the experimental results. Although the qualitative tendency of the angle-of-attack dependence of drag and lift could be reproduced, a high-precision solution showing the quantitative effect of grooving could not be obtained.