STUDY OF EFFECT OF PLACEMENT OF GROYNE ON SHARP BEND IN RIVER USING CFD ANALYSIS

Abstract

In a meandering river the most basic segment of the river is the point at which it changes its curvature, at this segment complex flow happens, also the additional forces like centrifugal force that become possibly the most important factor because of the curvature make the bank protection against scouring essential. As there are not much examination that focus on the investigation of flow in a channel bend, inferable from the complexities. Reenacting the shape and waterway conditions in a flume is likewise intense, fortunately making utilization of computational dynamic programming help in simulation studies. Groynes are usually installed along the river side and those are used for a lot of application such as bank protection. These structures would change the flow pattern and prevent bank erosion. So understanding turbulent flow pattern around groynes for designing groyne installation criteria is very important. In this subcritical flow pattern around an indirect groyne in different angle of installation was established and 3D simulations in Fluent software have been applied to investigate the effect of angle of groyne installation on separation zone length behind it. In this examination groyne at various positions on the channel bend are investigated utilizing ANSYS Fluent software. The turbulence model used was standard k-epsilon model for the flow. In all cases the channel width and inlet flow depth were constant and the bed slope of the channel was zero. The tip velocities, protected length and bed shear stress were compared for different positions of groyne. The most effective position of the groyne among the different cases was suggested in this study, also suggestions were made for the appropriate length of groyne.