Boussinesq-Peregrine water wave models and their numerical approximation

Theodoros Katsaounis, Dimitrios Mitsotakis, Georges Sadaka

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In this paper we consider the numerical solution of Boussinesq-Peregrine type systems by the application of the Galerkin finite element method. The structure of the Boussinesq systems is explained and certain alternative nonlinear and dispersive terms are compared. A detailed study of the convergence properties of the standard Galerkin method, using various finite element spaces on unstructured triangular grids, is presented. Along with the study of the Peregrine system, a new Boussinesq system of BBM-BBM type is derived. The new system has the same structure in its momentum equation but differs slightly in the mass conservation equation compared to the Peregrine system. Further, the finite element method applied to the new system has better convergence properties, when used for its numerical approximation. Due to the lack of analytical formulas for solitary wave solutions for the systems under consideration, a Galerkin finite element method combined with the Petviashvili iteration is proposed for the numerical generation of accurate approximations of line solitary waves. Various numerical experiments related to the propagation of solitary and periodic waves over variable bottom topography and their interaction with the boundaries of the domains are presented. We conclude that both systems have similar accuracy when approximate long waves of small amplitude while the Galerkin finite element method is more efficient when applied to BBM-BBM type systems.
Original languageEnglish (US)
Pages (from-to)109579
JournalJournal of Computational Physics
Volume417
DOIs
StatePublished - May 25 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: DM would like to thank King Abdullah University of Science and Technology (KAUST) Saudi Arabia, for its warm hospitality and support during this project. DM was supported also by the Victoria University of Wellington RSL fund and the Marsden Fund administered by the Royal Society of New Zealand with contract number VUW1418. This work is dedicated to Prof. Vassilios Dougalis on the occasion of his 70th birthday.

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