Numerical Simulation of Air-Water Two Phase Flow Over Coanda-Effect Screen Structure

Abstract

Application of numerical methods to assess the hydraulic performance of the screen Coanda-effect is investigated. This research project focused on flow observation and CFD simulation in the zone around the Coanda-effect screen. Numerical model is developed for clear water conditions. This model allows prediction of water discharge through the Coanda-effect screens, allowing to estimate the performance of the screen changes caused by variations in parameters screen design. Flow over the Coanda-effect screens can be modeled using the energy equation for spatially varied flow with decreasing discharge. Since the flow is supercritical, computations begin at the top of the screen and proceed in the downstream direction. The next phase of this PhD-research project is planned to be realized in cooperation with the Water Resources Research Laboratory, U.S. Bureau of Reclamation, Denver-Colorado (USA), where is performing experimental tests for improving Coanda-effect screen Technology, as coupling numerical and physical modeling for analysis of flow in structures with Coanda-effect screens. This can provide progress in better understanding of this phenomenon of flow. This article deals with experimental research and numerical simulations of specific phenomena in fluid flow called Coanda effect, which is important engineering application in the water intake structures of the small hydro power projects.