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21540 A Hamiltonian Boussinesq model with horizontally sheared currents
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Gagarina, E. and van der Vegt, J.J.W. and Ambati, V.R. and Bokhove, O. (2012) A Hamiltonian Boussinesq model with horizontally sheared currents. Memorandum 1977, Department of Applied Mathematics, University of Twente, Enschede. ISSN 1874-4850

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Abstract

We are interested in the numerical modeling of wave-current interactions around beaches’ surf zones. Any model to predict the onset of wave breaking at the breaker line needs to capture both the nonlinearity of the wave and its dispersion. We have formulated the Hamiltonian dynamics of a new water wave model. This model incorporates both the shallow water model and the potential flow model as limiting systems. The variational model derived by Cotter and Bokhove (2010) is such a model, but the variables used have been difficult to work with. Our new model has a three-dimensional velocity field consisting of the full three-dimensional potential field plus horizontal velocity components, such that the vertical component of vorticity is nonzero. Our aims are to augment the new model locally with bores and to derive a numerical finite element discretization of the new model including the capturing of bores. As a preliminary step, the variational finite element discretization of Miles’ variational principle coupled to an elliptic mesh generator is shown.

Item Type:Internal Report (Memorandum)
Research Group:EWI-MACS: Mathematics of Computational Science
Research Program:MESA-General
Research Project:A numerical Wave Tank for Complex Wave and Current Interactions, Compatible Mathematical Models for Coastal Hydrodynamics
Uncontrolled Keywords:Hamiltonian dynamics, Water wave model, Compatible schemes, (Dis)Continuous finite elements.
ID Code:21540
Deposited On:15 February 2012
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