Flow in a river confluence with a levee predicted by three-dimensional model

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A three-dimensional computational model, based on finite volume method and k-ε turbulence model, for predicting steady state confluence flow is presented. The confluence region is covered by a curvilinear grid which is generated numerically using a quasiconformal mapping method. The computation is done in the transformed domain which is a parallelipiped. The computed results agree well with the experimental results. The performance of a levee which facilitates two streams to mix gradually and thereby to reduce the superelevation and the strong secondary flow in the main stream, is demonstrated.

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