GALAZ, José; KAZOLEA, Maria; ROUSSEAU, Antoine

doi:10.1007/978-3-031-50769-4_21

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GALAZ, José
Littoral, Environment: MOdels and Numerics [LEMON]
Certified Adaptive discRete moDels for robust simulAtions of CoMplex flOws with Moving fronts [CARDAMOM]

KAZOLEA, Maria
Certified Adaptive discRete moDels for robust simulAtions of CoMplex flOws with Moving fronts [CARDAMOM]

ROUSSEAU, Antoine
Littoral, Environment: MOdels and Numerics [LEMON]

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Communication dans un congrès

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Lecture Notes in Computational Science and Engineering, Lecture Notes in Computational Science and Engineering, 27th International Conference on Domain Decomposition Methods in Science and Engineering - DD27, 2022-07-25, Prague. 2024-01-23, vol. LNCSE-149, p. 181-188

Springer Nature Switzerland

English Abstract

We derive transmission operators for coupling linear Green-Naghdi equations (LGNE) with linear shallow water equations (LSWE) --the heterogeneous case -- or for coupling LGNE with LGNE --the homogeneous case. We derive them from a domain decomposition method (Neumann-Dirichlet) of the linear Euler equations by applying the same vertical-averaging process and truncation of the asymptotic expansion of the velocity field used in the derivation of the equations. We find that the new asymptotic transmision conditions also correspond to Neumann and Dirichlet operators. In the homogeneous case the method has the same convergence condition as the parent domain decomposition method but leads to a solution that is different from the monodomain solution due to an $O(\Delta x)$ term. In the heterogeneous case the Neumann-Dirichlet operators translate into a simple interpolation across the interface, with an extra $O(\Delta x^2)$ term. We show numerically that in this case the method introduces oscillations whose amplitude grows as the mesh is refined, thus leading to an unstable scheme.Read less <

English Keywords

heterogeneous ddm

Coupling

Shallow water

Dispersive Wave

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Coupling Dispersive Shallow Water Models by Deriving Asymptotic Interface Operators

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