Two-dimensional analysis of flow field and associated scour parameters at downstream of weir with and without sloping apron

Abstract

The downstream scour of the control structure is a more common and very complex issue in river engineering. Flow structure in the vicinity of the control structure is entirely different from other parts of the river. Ansys Fluent Multiphase Eulerian model combined with hybrid Dense Discrete Phase Model (DDPM) provides much accurate and precise view of flow structure. This model provides a better understanding of flow structure, and it is associated scour development at upstream and downstream. Model simulation is performed on the trapezoidal weir and trapezoidal weir with sloping apron platforms to compare the flow structure, and it is associated scour. The erosion is computed by Mc Laury erosion model, and particle tracking is done using DDPM through a Lagrangian approach stimulate the movement of particles within the flow domain, velocity and other properties. This research focused on delivering much better anticipation about all flow features and sediment particle tracking captured in a closer manner. In this analysis with the trapezoidal weir, the velocity reached around 0.835 ms-1. However, as in the case of trapezoidal weir with sloping apron, the maximum velocity goes approximately 0.505 ms-1 which are nearly equal to inlet velocity. From the analysis, the sloping apron proves to be significant in protecting the downstream side of the control structure.