Modelling of flow pattern in an open channel with sidewall obstruction

Abstract

To predict flow pattern of shallow obstructed open channel flows, laboratory experiments of flow around a vertical emergent sidewall abutment (lateral constriction) in an open channel flow is simulated numerically and results of water surface and vertical profile of velocity are compared with the numerical results. The turbulence kinetic energy at the separation zone and bed shear stresses are also investigated. A computational fluid dynamic (CFD) numerical tool and volume of fluid (VOF) were used to predict water surface profiles. Results showed a very good agreement between the numerical and the experimental results of the water surface profiles. The numerical findings highlighted an increase in the velocity around the structure of two times the average flow velocity. The maximum pressure was observed in front of the constriction increases with increasing discharges. The vertical velocity profiles upstream the sidewall abutment at the three selected locations showed reasonable results. The maximum turbulence kinetic energy is shown at the zone of separation when the flow passes around the nose with high velocity. In this research, numerically it was found that the estimated bed shear stresses are 2-3 times the mean bed-shear stress of incoming flow. While, previous researchers finding showed a maximum value of bed shear stress near the leading edge 3.63 to 5 times the bed shear stress of the incoming flow. Because of the wide rang variation in calculating bed shear stresses by the previous researchers, so our research aims to calculate it using CFD and compare it with others. Also, dynamics of the flow around the obstacle was considered in this research under uniform flow conditions for an aspect ratio ranged 5 to 10.

Numerical simulation of flow pattern at a divergent pier in a bend with different relative curvature radii using ansys fluent

“…Their findings suggested that altering the bridge piers' position in the channel had an insignificant effect on the value of the maximum scour, while the value of the maximum sedimentation rose by 12% when the piers were displaced from 60 degrees to 90 degrees; however, moving them from 90 to 120° entailed a 42% decrease in the maximum sedimentation [14] 2021) developed a numerical model of the flow around a vertical emergent sidewall abutment in an open channel flow, eventually showing a good match between experimental and numerical results of the water surface profiles. They showed that increasing discharge increased the maximum pressure in front of the constriction [27]. explored the scour around a triad series of vertical piers in a bend.…”