HYDRAULIC CHARACTERISTICS OF RUBBLE WEIR

Abstract

Experimental and numerical models were conducted to investigate water flow over gabion weirs. In the experimental study, the water surface profile (WSP) was measured for different discharges, flow patterns, and downstream face slopes. In the numerical study, ANSYS® FLUENT Computational Fluid Dynamics (CFD) software was used to numerically simulate the flow over gabion weirs. The Reynolds-averaged Navіer-Stokеs equations were solved to predict the flow domain. The volume of fluid (VOF) method was applied to treat the complex free-surface flow. The structured high dense mesh was employed. The standard k-ε turbulence model was used to analyze turbulence downstream weir. The experimental results were used to verify the numerical model by two statistical indicators; the 1st indicator is the mean absolute percent error (МΑРΕ) and the 2nd indicator is the root mean square error (RМSΕ). Numerical results of the WSP showed good agreement with the experimental results. The values of RМSΕ and МΑРΕ were between (0.60% – 2.49%) and (0.53% – 1.92%) respectively. Key words: Gabions, Porous Weir, Experiment Model, CFD, VOF, Water Surface Profile (WSP).