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The current-modified nonlinear Schrödinger equation

Published online by Cambridge University Press:  25 November 1999

J. R. STOCKER  and
D. H. PEREGRINE
J. R. STOCKER
Affiliation:
School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, UK
D. H. PEREGRINE
Affiliation:
School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, UK
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Abstract

By comparison with both experimental and numerical data, Dysthe's (1979) O(ε4) modified nonlinear Schrödinger; equation has been shown to model the evolution of a slowly varying wavetrain well (here ε is the wave steepness). In this work, we extend the equation to include a prescribed, large-scale, O(ε2) surface current which varies about a mean value. As an introduction, a heuristic derivation of the O(ε3) current-modified equation, used by Bakhanov et al. (1996), is given, before a more formal approach is used to derive the O(ε4) equation. Numerical solutions of the new equations are compared in one horizontal dimension with those from a fully nonlinear solver for velocity potential in the specific case of a sinusoidal surface current, such as may be due to an underlying internal wave. The comparisons are encouraging, especially for the O(ε4) equation.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 399 , 25 November 1999 , pp. 335 - 353
Copyright
© 1999 Cambridge University Press

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