Invariant conservative difference schemes for shallow water equations in Eulerian and Lagrangian coordinates

• Published in: arXiv.org
• Main Authors: Dorodnitsyn, V A, Kaptsov, E I
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 28.08.2020
• Subjects: Computer Science - Numerical Analysis; Conservation laws; Finite difference method; Invariants; Lagrange coordinates; Mathematical analysis; Mathematics - Mathematical Physics; Mathematics - Numerical Analysis; Physics - Fluid Dynamics; Physics - Mathematical Physics; Shallow water equations
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2009.00710

The one-dimensional shallow water equations in Eulerian coordinates are considered. Relations between symmetries and conservation laws for the potential form of the equations, and symmetries and conservation laws in Eulerian coordinates are shown. An invariant difference scheme for equations in Eulerian coordinates with arbitrary bottom topography is constructed. It possesses all the finite-difference analogues of the conservation laws. Some bottom topographies require moving meshes in Eulerian coordinates, which are stationary meshes in mass Lagrangian coordinates. The developed invariant conservative difference schemes are verified numerically using examples of flow with various bottom topographies.