Direct Evaluation Method of Vorticity Combined with PTV
Direct Evaluation Method of Vorticity Combined with PTV
复制标题
结合PTV的涡度直接评价方法
DOI：
10.1117/12.2270541
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Goji Etoh
中科院分区：
文献类型：
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作者：
K. Takehara;T. Goji Etoh
粒子跟踪测速技术（Particle Tracking Velocimetry，PTV）是利用高速摄像机测量快速流动流体的涡量、剪切速率等变形的最有力的工具之一。我们已经开发了一种新的方法来估计涡量从随机定位的速度矢量获得的PTV。所提出的方法采用移动最小二乘法，是无网格数值模拟。从理论上推导了该方法的最佳拟合区域大小，并通过蒙特卡罗模拟进行了验证。对所提方法的精度进行了比较。结果表明，在任何情况下，该方法都比常用的方法更准确。
Particle Tracking Velocimetry, PTV, is one of the most powerful tools those can measure the deformation of fast flowing fluid, such as vorticity, shear rate, and so on, with a high-speed video camera. We have developed a new method to estimate vorticity from randomly located velocity vectors obtained by a PTV. The proposed method employs the Moving Least Square method that is developed for the meshless numerical simulation. The optimal size of fitting area of the proposed method is derived theoretically and is confirmed by the Monte Carlo simulation. The comparison of accuracy of the proposed method is carried out. The result shows that the proposed method is more accurate than the commonly used method in any case.