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    AN EFFICIENT SOLVER FOR NEARSHORE FLOWS

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    Eds. W. Blarn & C.A. Brebbia, WIT Press, Southampton

    Assembling and Solution in Structural Analysis using Parallel collective MPI operations

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    Composites 2009 – 2nd ECCOMAS Thematic Conference on the Mechanical Response of Composits . 1-3 Aprile 2009 Imperial College London UK (2009) - Proceedings su supporto informatic

    Macrovortices-induced horizontal mixing in compound channels

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    We investigate, within the framework of the nonlinear shallow water equations (NSWE), the generation and evolution of large-scale eddies with vertical axis (macrovortices hereinafter) which are responsible for much of the horizontal mixing occurring at the boundaries between the main channel and the flood planes of a compound channel. We show that the mechanism of generation of vorticity is essentially inviscid and is analogous to that occurring at a curved shock. Numerical experiments performed by means of a recently developed shock-capturing model for the solution of the NSWE, and described in Brocchini et al. (2001), clarify some features of macrovortices generation and allow us to quantify the momentum transfer across the channel
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