Numerical Simulation of flow patterns around Triangular porous weirs

Gabion porous weirs are of environment friendly structures that are made from local materials and have least negative impact on rivers. In this study a 3D-CFD code was utilized to simulate flow patterns about 6 types of Triangular porous weirs with various upstream-downstream slopes in 6 discharges run the gamut from 3 to 30 liters per second. The porosity of all weirs was constant and equal to 50% and also assumed to be made of spherical particles. Simulation results comprise flow surface profile; velocity distribution around weirs, the ratio of through to overall flow discharge and vortex areas is presented. Results indicate that the weir with upstream slope of 60° (UsS60°) provides least upstream water level and downstream speed and most ratio of through to total flow for a constant discharge, and the reverse goes to the weir with downstream slope of 30° ( DsS30°).