Analysis of cavity open-channel flows by means of PIV

Abstract

This paper describes the results of the flow visualization of cavity in open-channel flows by means of a Particle Image Velocimetry(PIV). The comparison of mean values, between the results of flow visualization and the high-accurate turbulence measurements conducted by making use of a two component fiber-optic laser Doppler anemometer (LDA) was carried out intensively, and the comparison of coherent structures, between the PIV results and the results of Large Eddy simulation(LES) was also conducted. The coherent structures were investigated in mixing layer by time-space correlation analysis. As the result, the characteristics and effects of coherent structures were revealed and then discussed.