Adiabatic perturbations for compactons under dissipation and numerically-induced dissipation

Authors:
Francisco Rus;Francisco R. Villatoro
Affiliations:
E.T.S. Ingeniería Informática, Dept. Lenguajes y Ciencias de la Computación, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain;E.T.S. Ingenieros Industriales, Dept. Lenguajes y Ciencias de la Computación, Universidad de Málaga, Campus de El Ejido, 29013 Málaga, Spain
Venue:
Journal of Computational Physics
Year:
2009

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Abstract

Compacton propagation under dissipation shows amplitude damping and the generation of tails. The numerical simulation of compactons by means of dissipative schemes also show the same behaviors. The truncation error terms of a numerical method can be considered as a perturbation of the original partial differential equation and perturbation methods can be applied to its analysis. For dissipative schemes, or when artificial dissipation is added, the adiabatic perturbation method yields evolution equations for the amplitude loss in the numerical solution and the amplitude of the numerically-induced tails. In this paper, such methods are applied to the K(2,2) Rosenau-Hyman equation, showing a very good agreement between perturbative and numerical results.