FLOW STRUCTURE IN SIDE CAVITY FLOW WITH SURFACE OSCILLATION

Abstract

When a rectangular side cavity section is installed to a relatively narrow open-channel flow, water surface oscillation is generated within the side cavity and main channel. However detailed experimental examinations of the three-dimensional flow field for these hydraulic structures have not been conducted so far. So we measured the three-dimensional local flow structure by applying the particle image velocimetry technique (PIV) to multiple vertical and horizontal cross-sections. Numerical analysis by three-dimensional large eddy simulation (LES) is also performed for comparison. It was made clear that the LES yields comparable results to the experiments in terms of the three-dimensional flow structure and surface oscillation.