期刊
PHYSICS OF FLUIDS
卷 34, 期 5, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0091839
关键词
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资金
- NSFC Basic Science Center Program [11988102]
- National Natural Science Foundation of China [92152106]
- Chinese Academy of Sciences [E1Z10101]
This study introduces an optimization method for the cross-correlation operation in particle image velocimetry by locating the correlation peaks assisted with constraint conditions. By constructing an objective function that includes the residual of the normalized cross-correlation term, a component for spatial smoothness, and a component for temporal smoothness, optimized velocity fields for a series of tracer images can be obtained for spatiotemporal smoothness.
We introduce an optimization method for the cross-correlation operation in particle image velocimetry by locating the correlation peaks assisted with constraint conditions. In this study, an objective function was constructed to include the residual of the normalized cross-correlation term, a component in charge of spatial smoothness (inspired by the optical flow method as used in a previous study) and a component for temporal smoothness (inspired by the concept of trajectory selection in particle tracking velocimetry). Minimizing the objective function gives optimized velocity fields for a series of tracer images for spatiotemporal smoothness. The proposed method was examined in synthetic images of turbulent flow and Batchelor vortex and in a laboratory experiment of vortex rings. The effect of image background noises and the initial guess for the optimization process were examined and discussed. Published under an exclusive license by AIP Publishing.
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