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Article Dans Une Revue Wave Motion Année : 2022

The Cubic Vortical Whitham Equation

John Carter
Henrik Kalisch
  • Fonction : Auteur
Christian Kharif

Résumé

The cubic-vortical Whitham equation is a model for wave motion on a vertically sheared current of constant vorticity in a shallow inviscid fluid. It generalizes the classical Whitham equation by allowing constant vorticity and by adding a cubic nonlinear term. The inclusion of this extra nonlinear term allows the equation to admit periodic, traveling-wave solutions with larger amplitude than the Whitham equation. Increasing vorticity leads to solutions with larger amplitude as well. The stability of these solutions is examined numerically. All moderate- and large-amplitude solutions, regardless of wavelength, are found to be unstable. A formula for a stability cutoff as a function of vorticity and wavelength for small-amplitude solutions is presented. In the case with zero vorticity, small-amplitude solutions are unstable with respect to the modulational instability if kh > 1.252, where k is the wavenumber and h is the mean fluid depth.
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Dates et versions

hal-03547961 , version 1 (10-03-2023)

Identifiants

Citer

John Carter, Henrik Kalisch, Christian Kharif, Malek Abid. The Cubic Vortical Whitham Equation. Wave Motion, 2022, 110, pp.102883. ⟨10.1016/j.wavemoti.2022.102883⟩. ⟨hal-03547961⟩
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