Hybrid particle image velocimetry with the combina

Authors: Zifeng Yang Mark Johnson

Publish Date: 2017/02/14

Volume: 20, Issue: 3, Pages: 625-638

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Abstract

Through a combination of crosscorrelation and optical flow method OFM a novel technique can benefit from the strengths of each method while mitigating the flaws each individual method contains The hybrid Particle Image Velocimetry PIV method utilizes the stateoftheart crosscorrelation method to account for the relatively large displacements of particles and refine the flow field using the highresolution analysis of OFM Image processing techniques such as interpolation image shifting and Gaussian filtering are crucial for integrating the crosscorrelation technique with optical flow analysis The accuracy of the hybrid PIV method was validated using standard simulated PIV images that encompassed various parameters encountered in PIV measurements Each set of images was analyzed by the hybrid method and three other widely used correlation techniques to verify the accuracy Results confirmed that the hybrid method is consistently more accurate than the other methods in generating the flow vectors especially near the boundaries Additionally for cases dealing with largesized particles or small displacements the hybrid PIV method also attains more accurate results

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