Self-similar radiation from numerical Rosenau-Hyman compactons

Journal Article · Sat Nov 10 04:00:00 EST 2007 · Journal of Computational Physics

DOI:https://doi.org/10.1016/j.jcp.2007.07.024· OSTI ID:21028291

Rus, Francisco ^[1]

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1. E.T.S. Ingenieria Informatica, Dept. Lenguajes y Ciencias de la Computacion, Universidad de Malaga, Campus de Teatinos, 29071 Malaga (Spain)

The numerical simulation of compactons, solitary waves with compact support, is characterized by the presence of spurious phenomena, as numerically induced radiation, which is illustrated here using four numerical methods applied to the Rosenau-Hyman K(p, p) equation. Both forward and backward radiations are emitted from the compacton presenting a self-similar shape which has been illustrated graphically by the proper scaling. A grid refinement study shows that the amplitude of the radiations decreases as the grid size does, confirming its numerical origin. The front velocity and the amplitude of both radiations have been studied as a function of both the compacton and the numerical parameters. The amplitude of the radiations decreases exponentially in time, being characterized by a nearly constant scaling exponent. An ansatz for both the backward and forward radiations corresponding to a self-similar function characterized by the scaling exponent is suggested by the present numerical results.

• OSTI ID: 21028291
• Journal Information: Journal of Computational Physics, Journal Name: Journal of Computational Physics Journal Issue: 1 Vol. 227; ISSN JCTPAH; ISSN 0021-9991
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
EQUATIONS
FUNCTIONS
SCALING
SIMULATION
TOPOLOGY