The Whitham equation with surface tension

Evgueni Dinvay, Daulet Moldabayev, Denys Dutykh, Henrik Kalisch

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The viability of the Whitham equation as a nonlocal model for capillary-gravity waves at the surface of an inviscid incompressible fluid is under study. A nonlocal Hamiltonian system of model equations is derived using the Hamiltonian structure of the free-surface water-wave problem and the Dirichlet–Neumann operator. The system features gravitational and capillary effects, and when restricted to one-way propagation, the system reduces to the capillary Whitham equation. It is shown numerically that in various scaling regimes the Whitham equation gives a more accurate approximation of the free-surface problem for the Euler system than other models like the KdV and Kawahara equation. In the case of relatively strong capillarity considered here, the KdV and Kawahara equations outperform the Whitham equation with surface tension only for very long waves with negative polarity.

Original languageBritish English
Pages (from-to)1125-1138
Number of pages14
JournalNonlinear Dynamics
Issue number2
StatePublished - 1 Apr 2017


  • Capillarity
  • Fully dispersive equations
  • Hamiltonian systems
  • Surface waves


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