Numerical Study on Effect of Bend Radius on the Velocity Field in Curved Open Channels

فاقد چكيده فارسي

In this study by 3D numerical simulation of flow field with ANSYS-CFX software, variations of velocity profiles in different sections of bend in three phases (i.e. air, water and sediment) were investigated. At first, the 90o bend with R B = 3 was simulated and its results were verified using experimental data that have been obtained in an experimental analysis. Then by changing the ratio of bend radius to channel width, the effect of curvature radius on flow field in 90o bend was studied. Results showed that in R < 3 B maximum of velocity mostly occurs in inner wall while in R B > 3 secondary flow is stronger than of longitudinal flow, so this causes to transfer the maximum velocity from inner wall to outer wall.