Numerical Simulation of Bed Topography and Flow Field around Double Rows-Barriers and Gabion Groin in the Direct Channel using Flow-3D

Abstract

The erosion of bed and river banks and sediment transport is one of the reasons for migration and changes in river morphology, which causes changes in the quality and quantity of flow. Groins are among the rivers' structures that extend from the coast to the river's axis. One of the important issues in their design is the localized scouring phenomenon on the nose, which appears due to changes in the pattern of flow and the presence of strong vortices. In recent years, most of the research on single-row open and closed open spray guns has been carried out and has been performed in a laboratory. Therefore, in this research, scouring and three-dimensional flow patterns were simulated near the open two-row openings with two zigzag and parallel formations with Flow-3D model and using the RNG turbulence model and compared with experimental results. The results showed that the scour area and the dimensions obtained from numerical simulation as well as flow patterns are in good agreement with experimental results.

Keywords

• scouring
• groin
• gabion
• flow-3d
• rng