EVALUATION OF MODIFIED k−ε MODELS IN SIMULATING 3D FLOWS OVER SUBMERGED SPUR DIKES

A three-dimensional numerical model incorporating a k−ε type of turbulence model was developed for flows in open channels with submerged spur dikes. The applicability of the standard k−ε model, three modified linear models and a nonlinear model were tested for two different flows. Comparison among these models with the experiments showed that the modified k−ε models reproduce the turbulence quantities better than the standard model and that the nonlinear model can achieve more accurate predictions. The superiority of the nonlinear model over the linear models is attributed to its more accurate approximation of Reynolds stresses, and hence improved calculation of turbulent eddy viscosity around spur dikes.