Numerical simulation of cylindrical solitary waves in periodic media

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Journal of Scientific Computing, ISSN: 0885-7474, Vol: 58, Issue: 3, Page: 672-689

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Quezada de Luna, Manuel; Ketcheson, David I.
Springer Nature; Springer Verlag
Mathematics; Computer Science; Engineering; Stegotons; Solitary waves; Periodic media; Effective dispersion; Hyperbolic PDEs; Riemann solvers; Mathematics - Numerical Analysis; Condensed Matter - Materials Science
article description
We study the behavior of nonlinear waves in a two-dimensional medium with density and stress relation that vary periodically in space. Efficient approximate Riemann solvers are developed for the corresponding variable-coefficient first-order hyperbolic system. We present direct numerical simulations of this multiscale problem, focused on the propagation of a single localized perturbation in media with strongly varying impedance. For the conditions studied, we find little evidence of shock formation. Instead, solutions consist primarily of solitary waves. These solitary waves are observed to be stable over long times and to interact in a manner approximately like solitons. The system considered has no dispersive terms; these solitary waves arise due to the material heterogeneity, which leads to strong reflections and effective dispersion. © Springer Science+Business Media New York 2013.