scholarly journals Moving mesh methods for solving parabolic partial differential equations

2011 ◽  
Vol 46 (1) ◽  
pp. 353-361 ◽  
Author(s):  
R. Marlow ◽  
M.E. Hubbard ◽  
P.K. Jimack
Keyword(s):  
Partial Differential Equations ◽  
Differential Equations ◽  
Moving Mesh ◽  
Parabolic Partial Differential Equations ◽  
Partial Differential ◽  
Moving Mesh Methods

scholarly journals R-Adaptive Multisymplectic and Variational Integrators

Mathematics ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 642 ◽  
Author(s):  
Tomasz M. Tyranowski ◽  
Mathieu Desbrun
Keyword(s):  
Partial Differential Equations ◽  
Differential Equations ◽  
Adaptive Methods ◽  
Adaptation Strategy ◽  
Moving Mesh ◽  
Partial Differential ◽  
Variational Discretization ◽  
Adaptive Schemes ◽  
Moving Mesh Methods ◽  
Methods Numerical

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.

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