MULTIGRID APPROACH TO CROSS-CORRELATION DIGITAL PIV AND HPIV ANALYSIS

摘要

A new method of cross-correlation digital PIV (CCD-PIV) analysis of two single-exposed images based on a multigrid approach is presented in this paper. Multi-grid CCDPIV (MCCDPIV) analysis is an evolution of the adaptive CCDPIV analysis method (Soria(1996b) and can be used to interrogate two single-exposed digital, photographic or hologram recordings of seed particles in a fluid flow containing a large range of velocity and length scales without a priori knowledge of the flow and with minimal user intervention. A comparative investigation of the accuracy between MCCDPIV and standard CCDPIV processing has been carried out using computer generated digital images with known velocity (displacement) fields.