摘要
采用基于Smagorinsky-Lilly亚格子模型的大涡模拟方法模拟了一个直径为42.6mm,布有均匀凹坑的高尔夫球的绕流流场,证实了其尾涡分离点比光滑球的分离点远,其绕流阻力较小.模拟了自转速度为100rad/s的正旋和逆旋的高尔夫球,发现它们的尾流分布更不均匀,并因此产生了垂直于来流方向的压力,压力大小不受自转方向的影响;并发现带有旋转效应的凹坑高尔夫球受到的阻力系数增大;自旋对于球的上下面压力有明显影响.
The numerical simulation of uniform flow past a golf ball with diameter of 42.6 mm and with well-distributed pits is carried out by using the large eddy simulation（LES） method,based on the Smagorinsky—Lilly subgrid scale model.The results show that the detached point of the ball＇s wake is farther than that for a ball of smooth sphere and the drag on the golf ball is smaller.Consider the uniform flow past a golf ball with the effect of clockwise and anticlockwise rotations with a speed of 100 rad/s.The results show that the wake structure is more uneven,which would result in the pressure perpendicular to the flow direction.The magnitude of pressure has nothing to do with the direction of the rotation and the drag coefficient is larger than that of a non-rotation golf ball.Rotation has an important influence on the pressure.
出处
《力学与实践》
CSCD
北大核心
2011年第3期63-66,55,共5页
Mechanics in Engineering
关键词
绕流
大涡模拟
绕流阻力
垂直压力
uniform flow
LES
drag of uniform flow
perpendicular pressure
