NUMERICAL SIMULATION OF OPEN-CHANNEL FLOW IN A CURVED CHANNEL WITH BEDFORM OF A RIVER BEND

Turbulent flow around a channel bend has been computed by Large Eddy Simulation (LES) method. The bed forms of the channels considered are contoured like those of natural rivers with pointbars and the calculation results are compared with those of flows around a similar bend with a flat bed. The simulated flows are of laboratory-scale flows and no special near-wall model is applied but the results show important features of the flow around a bend and a reasonable agreement with the available experimental results. Particularly, the secondary flows near the outer bank along with the main secondary flows induced by the streamline curvature are reproduced well and the effects of the bed form on these flow and the turbulent characteristics are reproduced.