NUMERICAL MODELING OF OPEN CHANNEL FLOW WITH H2 WATER SURFACE PROFILES

Abstract

In open channel flows, 12 different surface profiles are formed depending on the flow conditions.The occur of water surface profiles varies depending on the upstream and downstream waterdepths, bed slope and the geometric characteristics of the interacted structure. The relation of the measured water depth without any structure with the critical water depth, formed in situation ofcritical flow, are used in the classification of the flow profiles. Open channel flows with differentwater surface profiles have been investigated experimentally in detail by researchers. Because ofadvances in technology in recent years, it is possible to solve governing equations bycomputational fluid dynamics methods. Computational fluid dynamics methods, which are moreeconomical than experimental models, are frequently used in solving hydraulic problems. In thisstudy, numerical solutions of open channel flow with different water surface profiles arecalculated. The turbulence shear stress in numerical modeling is calculated by using the ReNormalization Group (RNG) model and the water-air intersection is determined by using theVolume of Fluids (VOF) method. Experimental measurements in the literature and numericalmodel results are compared. The numerical model is found to be successful in determining thewater surface, especially in the drop region where H2 profile is formed.