Preserving energy resp. dissipation in numerical PDEs using the "Average Vector Field" method

Details Preserving energy resp. dissipation in numerical PDEs using the "Average Vector Field" method Preserving energy resp. dissipation in numerical PDEs using the "Average Vector Field" method

2012-02-21

arxiv.org/abs/1202.4555v1

Mathematics

Numerical Analysis

Scientific paper

We give a systematic method for discretizing Hamiltonian partial differential equations (PDEs) with constant symplectic structure, while preserving their energy exactly. The same method, applied to PDEs with constant dissipative structure, also preserves the correct monotonic decrease of energy. The method is illustrated by many examples. In the Hamiltonian case these include: the sine-Gordon, Korteweg-de Vries, nonlinear Schrodinger, (linear) time-dependent Schrodinger, and Maxwell equations. In the dissipative case the examples are: the Allen-Cahn, Cahn-Hilliard, Ginzburg-Landau, and heat equations.

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