High-performance technique for initial velocity field calculation based on PIV images processing

Abstract

The high-performance technique is proposed in order to calculate the initial velocity field for planar Particle Image Velocimetry. The proposed technique is based on the use of Parallel Projection Correlation technique together with the region of interest that allows acceleration of calculation procedure and significantly increase the maximum value of measurable velocity using small-sized interrogation window at the first iteration. To show the performance of proposed technique, two synthetic test cases are considered in this investigation: one-dimensional uniform flow and linear shear flow. Accuracy analysis is carried out depending on different interrogation window sizes for two velocity components. The results of test cases show good performance of proposed technique in terms of accuracy. Finally, the proposed technique is applied together with the iterative multigrid window-deformation technique based on fractional interrogation window offset.