CFD ANALYSIS FOR THE DETERMINATION OF DISCHARGE COEFFICIENT BY USING A PRISMATIC SILL BELOW A VERTICAL SLUICE GATE

Abstract

Sluice gates are commonly used to control water flow through irrigation canals. Free flow or submerged flow occurs when the flow is dependent on the upstream head, gate opening, and downstream head. Once the sluice gate depth is higher than certain layout criteria, the use of double or triple leaf gates is common. The goal of this research is to see how constructing a sill with a well-defined form below a sluice gate alters the flow submerged underneath. In comparison to other downstream slopes of sills, studies have shown that the sill of the trapezoidal with a downstream slope of 1Vertical and 5Horizontal enhances discharge under the gate which generates the smallest increase in the length of jump developed through the downstream section. It is taken into account both subcritical and supercritical flow. The main consideration for the flow below the sluice gate was the discharge coefficient of the sluice gate. The simulations are run on a CFD-based software with a Flume of the proper length and sills of various heights under a variety of flow conditions. The coefficient of discharge was correlated to the other relevant flow and sill variables using dimensional analysis. The discharge coefficient predictions obtained using the developed equations are compared. H/G the head-gate opening ratio difference, H1/G Ratio of upstream head-gate openings, z/b characteristics of the sill, and Yt/G tail-water depth-gate having opened ratio all influence the discharge coefficient. It was discovered that for submerged subcritical flow, the tempo of change of the discharge of coefficient is higher and moderate for critical submerged flow, and for the submerged supercritical flow, the rate of change is mostly constant.