Three-dimensional simulation of flow and vortex patterns around the L-shaped impermeable groins at five different angles of the first half of the semicircular arc

In order to river organization operations different ways are used which are selected depending on river morphology pathway, climatic conditions, the impact on surrounding land, the design objectives and etc. Use of groins at the stabilization and consolidation of the river side and create a path for guiding the flow has many applications. Erosion and sedimentation around the groins is a function of several factors include the type of groin, surrounding flow pattern, geometry, the amount of sediment transported by water and engineering purposes. In this paper, flow pattern around the L-shaped groins perpendicular to the coast simulated as 3D. In this study, an impermeable L-shaped groin as non-submerged placed form 30, 45, 60, 75 and 90 angles of river arc and in order to simulate the flow pattern and turbulence around the groin among available turbulence models in the software, K ?? two-equation turbulence model was used. Results showed that location of vortex erosion forming is around the area of maximum velocities and, finally the maximum erosion is around the spit of groin and by changing the position of groin in direction of arc different angles at the angles of 75 degrees and 90 degrees has maximum and minimum value respectively.