Direct evaluation method of vorticity combined with PTV

K. Takehara; T. G. Etoh

doi:10.1117/12.2270541

20 February 2017 Direct evaluation method of vorticity combined with PTV

K. Takehara, T. G. Etoh

Proceedings Volume 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics; 103280Z (2017) https://doi.org/10.1117/12.2270541
Event: 31st International Congress on High-Speed Imaging and Photonics, 2016, Osaka, Japan

Abstract

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.

Citation Download Citation

K. Takehara and T. G. Etoh "Direct evaluation method of vorticity combined with PTV", Proc. SPIE 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics, 103280Z (20 February 2017); https://doi.org/10.1117/12.2270541

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