Abstract:

The difficulty and feasibility of applying FLUENT software to river dynamics were analyzed. The mixture model was used to simulate the river with rectangular sand pit in two conditions (clear water and sediment-laden water). Results show that the coupled calculation of the sediment laden water could well simulate the two-phase water-sediment transport in river. The existence of sediment influences the momentum variation of water, reduces the convergence speed of the modeling, and also restrains the turbulence of water. Secondary vortex flow forms at the sand pit corner which will cause scouring towards the upstream and deposit in the downstream.

Key words: sediment-laden flow, mixture model, rectangular sand-pit, vertical 2-dimensional model