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Discontinuous-Galerkin Discretization of a New Class of Green-Naghdi Equations

Published online by Cambridge University Press:  24 March 2015

Arnaud Duran
Affiliation:
Institut de Mathématiques et de Modélisation de Montpellier (I3M), Université Montpellier 2, CC 051, 34090 Montpellier, France Inria, Project Team LEMON, Bt 5 – CC05 017 – 34095 Montpellier, France
Fabien Marche*
Affiliation:
Institut de Mathématiques et de Modélisation de Montpellier (I3M), Université Montpellier 2, CC 051, 34090 Montpellier, France Inria, Project Team LEMON, Bt 5 – CC05 017 – 34095 Montpellier, France
*
*Corresponding author. Email addresses:[email protected] (A. Duran), [email protected] (F. Marche)
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Abstract

We describe in this work a discontinuous-Galerkin Finite-Element method to approximate the solutions of a new family of 1d Green-Naghdi models. These new models are shown to be more computationally efficient, while being asymptotically equivalent to the initial formulation with regard to the shallowness parameter. Using the free surface instead of the water height as a conservative variable, the models are recasted under a pre-balanced formulation and discretized using a nodal expansion basis. Independently from the polynomial degree in the approximation space, the preservation of the motionless steady-states is automatically ensured, and the water height positivity is enforced. A simple numerical procedure devoted to stabilize the computations in the vicinity of broken waves is also described. The validity of the resulting model is assessed through extensive numerical validations.

Type
Research Article
Copyright
Copyright © Global-Science Press 2015 

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