R-Adaptive Multisymplectic and Variational Integrators

Tomasz M. Tyranowski and Mathieu Desbrun
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Tomasz M. Tyranowski: Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany
Mathieu Desbrun: Department of Computing and Mathematical Sciences, California Institute of Technology, Pasadena, CA 91125, USA

Mathematics, 2019, vol. 7, issue 7, 1-52

Abstract: Moving mesh methods (also called r -adaptive methods) are space-adaptive strategies used for the numerical simulation of time-dependent partial differential equations. These methods keep the total number of mesh points fixed during the simulation but redistribute them over time to follow the areas where a higher mesh point density is required. There are a very limited number of moving mesh methods designed for solving field-theoretic partial differential equations, and the numerical analysis of the resulting schemes is challenging. In this paper, we present two ways to construct r -adaptive variational and multisymplectic integrators for (1+1)-dimensional Lagrangian field theories. The first method uses a variational discretization of the physical equations, and the mesh equations are then coupled in a way typical of the existing r -adaptive schemes. The second method treats the mesh points as pseudo-particles and incorporates their dynamics directly into the variational principle. A user-specified adaptation strategy is then enforced through Lagrange multipliers as a constraint on the dynamics of both the physical field and the mesh points. We discuss the advantages and limitations of our methods. Numerical results for the Sine–Gordon equation are also presented.

Keywords: geometric numerical integration; variational integrators; multisymplectic integrators; field theory; moving mesh methods; moving mesh partial differential equations; solitons; Sine–Gordon equation (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2019
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