Shifted boundary method pour systèmes hyperboliques: ondes linéaires et équations shallow water
RICCHIUTO, Mario
Certified Adaptive discRete moDels for robust simulAtions of CoMplex flOws with Moving fronts [CARDAMOM]
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Certified Adaptive discRete moDels for robust simulAtions of CoMplex flOws with Moving fronts [CARDAMOM]
Language
en
Rapport
This item was published in
2017-12-22p. 1-56
Abstract
On propose une nouvelle approche pour des simulations avec bords immergés pour des systèmes hyperboliques et en particulier les équations shallow water. L’approche proposée consiste en modifier les conditions au bords avec ...Read more >
On propose une nouvelle approche pour des simulations avec bords immergés pour des systèmes hyperboliques et en particulier les équations shallow water. L’approche proposée consiste en modifier les conditions au bords avec un développement limité permettant d’assurer l’ordre deux avec des embedded boundaries. L’approche est implementé est ici dans le cadre d’une méthode de type stabilized finite element sur un très grand nombre de cas tests représentatifs d’applications de propagation de vagues et inondationRead less <
English Abstract
We propose a new computational approach for embedded boundary simulations ofhyperbolic systems. Applications are shown for the linear wave equations and for the nonlinearshallow water system. The proposed approach belongs ...Read more >
We propose a new computational approach for embedded boundary simulations ofhyperbolic systems. Applications are shown for the linear wave equations and for the nonlinearshallow water system. The proposed approach belongs to the class of surrogate/approximateboundary algorithms and is based on the idea of shifting the location where boundary conditionsare applied from the true to a surrogate boundary. Accordingly, boundary conditions, enforcedweakly, are appropriately modified to preserve optimal error convergence rates. This frameworkis applied here in the setting of a stabilized finite element method, even though other spatialdiscretization techniques could have been employed. Accuracy, stability and robustness of theproposed method are tested by means of an extensive set of computational experiments for theacoustic wave propagation equations and shallow water equations. Comparisons with standardweak boundary conditions imposed on grids that conform to the geometry of the computationaldomain boundaries are also presented.Read less <
Keywords
conditions aux bords embedded
équations des ondes
équations shallow water
éléments finis
méthodes immergées
English Keywords
Embedded boundary conditions
approximate boundary methods
wave equation
shallow water flows
finite elements
Origin
Hal imported