Johnson, ER;
Pelinovsky, DE;
(2016)
Orbital stability of periodic waves in the class of reduced Ostrovsky equations.
Journal of Differential Equations
, 261
(6)
pp. 3268-3304.
10.1016/j.jde.2016.05.026.
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Abstract
Periodic travelling waves are considered in the class of reduced Ostrovsky equations that describe low-frequency internal waves in the presence of rotation. The reduced Ostrovsky equations with either quadratic or cubic nonlinearities can be transformed to integrable equa- tions of the Klein–Gordon type by means of a change of coordinates. By using the conserved momentum and energy as well as an additional conserved quantity due to integrability, we prove that small-amplitude periodic waves are orbitally stable with respect to subharmonic perturbations, with period equal to an integer multiple of the period of the wave. The proof is based on construction of a Lyapunov functional, which is convex at the periodic wave and is conserved in the time evolution. We also show numerically that convexity of the Lyapunov functional holds for periodic waves of arbitrary amplitudes.
| Type: | Article |
|---|---|
| Title: | Orbital stability of periodic waves in the class of reduced Ostrovsky equations |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jde.2016.05.026 |
| Publisher version: | http://dx.doi.org/10.1016/j.jde.2016.05.026 |
| Language: | English |
| Additional information: | Copyright © 2016 Elsevier Inc. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/). The final published version can be accessed at http://dx.doi.org/10.1016/j.jde.2016.05.026 |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1493104 |
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