Soliton interaction for the extended Korteweg-de Vries equation

T R Marchant, N F Smyth

Research output: Contribution to journalArticlepeer-review

Abstract

Soliton interactions for the extended Korteweg-de Vries (KdV) equation are examined. It is shown that the extended KdV equation can be transformed (to its order of approximation) to a higher-order member of the KdV hierarchy of integrable equations. This transformation is used to derive the higher-order, two-soliton solution for the extended KdV equation. Hence it follows that the higher-order solitary-wave collisions are elastic, to the order of approximation of the extended KdV equation. In addition, the higher-order corrections to the phase shifts are found. To examine the exact nature of higher-order, solitary-wave collisions, numerical results for various special cases (including surface waves on shallow water) of the extended KdV equation are presented. The numerical results show evidence of inelastic behaviour well beyond the order of approximation of the extended KdV equation; after collision, a dispersive wavetrain of extremely small amplitude is found behind the smaller, higher-order solitary wave.

Original languageEnglish
Pages (from-to)157-176
Number of pages20
JournalIMA Journal of Applied Mathematics
Volume56
Issue number2
Publication statusPublished - Apr 1996

Keywords

  • INTEGRABLE SYSTEMS
  • WAVE SOLUTIONS
  • ORDER
  • PERTURBATION
  • AMPLITUDE
  • FLOW

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