Multirate time stepping for accelerating explicit discontinuous Galerkin computations with application to geophysical flows
| Autor: | Jean-François Remacle, Vincent Legat, Jonathan Lambrechts, Bruno Seny, Richard Comblen |
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| Rok vydání: | 2012 |
| Předmět: |
Mathematical optimization
Partial differential equation Computer science Applied Mathematics Mechanical Engineering Computation Computational Mechanics Supercomputer Great barrier reef Mathematics::Numerical Analysis Computer Science Applications Consistency (database systems) Mechanics of Materials Discontinuous Galerkin method Shallow water equations Conservation of mass |
| Zdroj: | International Journal for Numerical Methods in Fluids. 71:41-64 |
| ISSN: | 0271-2091 |
| DOI: | 10.1002/fld.3646 |
| Popis: | This paper presents multirate explicit time-stepping schemes for solving partial differential equations with discontinuous Galerkin elements in the framework of Large-scale marine flows. It addresses the variability of the local stable time steps by gathering the mesh elements in appropriate groups. The real challenge is to develop methods exhibiting mass conservation and consistency. Two multirate approaches, based on standard explicit Runge–Kutta methods, are analyzed. They are well suited and optimized for the discontinuous Galerkin framework. The significant speedups observed for the hydrodynamic application of the Great Barrier Reef confirm the theoretical expectations. |
| Databáze: | OpenAIRE |
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