Evaluation of pressure field and fluid forces on a circular cylinder with and without rotational oscillation using velocity data from PIV measurement
Evaluation of pressure field and fluid forces on a circular cylinder with and without rotational oscillation using velocity data from PIV measurement
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DOI：
10.1088/0957-0233/16/4/011
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发表时间：
2005-04-01
影响因子：
2.4
通讯作者：
Srinivas, K
中科院分区：
文献类型：
--
作者：
Fujisawa, N;Tanahashi, S;Srinivas, K
利用粒子图像测速技术（PIV）测量的瞬时速度数据，研究了一种评估钝体结构压力场和流体力的实验方法。该方法利用PIV的实验速度数据对压力泊松方程进行数值求解。使用两个并排放置的CCD相机对圆柱体周围的速度场进行测量，这使得能够同时测量圆柱体周围的近场和远场速度。通过这种方法评估的静止圆柱体上的压力和流体力与文献中的结果非常吻合，表明该技术的有效性。本技术还应用于雷诺数为2000且做旋转振荡的圆柱体。研究发现，圆柱体上的阻力在低频振荡时增大，在高频振荡时减小。高频振荡时的阻力系数相对于静止圆柱体降低了30%，而由于高频振荡时产生同步涡脱落，脉动升力略有增加。
An experimental method for evaluating pressure field and fluid forces on a bluff body structure is studied using instantaneous velocity data measured by particle image velocimetry (PIV). This method solves a pressure Poisson equation numerically with the experimental velocity data by PIV The measurement of the velocity field around a circular cylinder is carried out using two CCD cameras placed side by side, which allows simultaneous measurement of velocity near and far field around the circular cylinder. The pressure and fluid forces on the stationary cylinder evaluated by this method agree closely with those in the literature, suggesting the validity of this technique. The present technique is also applied to a circular cylinder with rotational oscillation at Reynolds number 2000. It is found that the drag force on a circular cylinder is magnified at low-frequency oscillation and reduced at high-frequency oscillation. The drag coefficient at high-frequency oscillation is reduced by 30% with respect to the stationary cylinder, while the fluctuating lift is slightly increased due to the generation of synchronized vortex shedding at high-frequency oscillation.