Nash-Moser theory for standing water waves

P. I. Plotnikov, J. F. Toland

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

We consider a perfect fluid in periodic motion between parallel vertical walls, above a horizontal bottom and beneath a free boundary at constant atmospheric pressure. Gravity acts vertically downwards. Suppose the underlying flow is two-dimensional in a vertical plane orthogonal to the walls and satisfies the constant-pressure condition on the free boundary where surface tension is neglected. Suppose also that it is symmetric about a plane midway between the walls, and periodic in time. Such motion, which can be extended to give a two-dimensional flow of infinite horizontal extent that is periodic in space as well as in time, is referred to as a standing wave. Unlike progressive (or steady) Stokes waves, standing waves are not stationary relative to a moving reference frame.

The purpose of this paper is to show how the Nash-Moser iteration method can be adapted to give a rigorous proof of the existence of small-amplitude standing waves for which the normal component of pressure gradient on the free surface satisfies additional constraints. These constraints are imposed in advance to facilitate the a priori bounds needed for the Nash-Moser method and only solutions satisfying them have been found.(They have no obvious analogue in the theory of Stokes waves.)

The presentation is self-contained and includes a version of the Nash-Moser theorem tailored for the purpose. The imposed constraints are used to define a manifold upon which iteration is carried out and a detailed account from first principles of the a priori bounds required to implement the method is given. We use the Lagrangian form of the Euler equations throughout.
Original languageEnglish
Pages (from-to)1-83
Number of pages83
JournalArchive for Rational Mechanics and Analysis
Volume159
Issue number1
DOIs
Publication statusPublished - 31 Aug 2001

Cite this