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The non-linear k-e model is applied to 3-D computation of unsteady flows in compound open channels with horizontal vortices generated by the shear instability and the secondary currents of 2nd kind. Model performance is investigated through the examination of the calculated results. It is pointed out that the typical flow features such as the horizontal vortices and the secondary currents can be simulated numerically by the non-linear k-e model considering the effect of the strain parameter on the eddy viscosity, though further model refinement is needed to reproduce the 3-D flow structure precisely.

3-D Computation of Unsteady Flows in Compound Open Channels with Horizontal Vortices and Secondary Currents