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Discrete gradient methods have an energy conservation law

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arxiv 1302.4513 v1 pith:72UB5VII submitted 2013-02-19 math.NA cs.NA

Discrete gradient methods have an energy conservation law

classification math.NA cs.NA
keywords conservationdiscreteconservedcontinuousdensityenergyfluxgradient
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We show for a variety of classes of conservative PDEs that discrete gradient methods designed to have a conserved quantity (here called energy) also have a time-discrete conservation law. The discrete conservation law has the same conserved density as the continuous conservation law, while its flux is found by replacing all derivatives of the conserved density appearing in the continuous flux by discrete gradients.

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