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Large dispersion, averaging and attractors: three 1D paradigms

Kostianko, Anna, Titi, Edriss and Zelik, Sergey (2018) Large dispersion, averaging and attractors: three 1D paradigms Nonlinearity, 31 (12), R317.

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Abstract

The effect of rapid oscillations, related to large dispersion terms, on the dynamics of dissipative evolution equations is studied for the model examples of the 1D complex Ginzburg-Landau and the Kuramoto-Sivashinsky equations. Three different scenarios of this effect are demonstrated. According to the first scenario, the dissipation mechanism is not affected and the diameter of the global attractor remains uniformly bounded with respect to the very large dispersion coefficient. However, the limit equation, as the dispersion parameter tends to infinity, becomes a gradient system. Therefore, adding the large dispersion term actually suppresses the non-trivial dynamics. According to the second scenario, neither the dissipation mechanism, nor the dynamics are essentially affected by the large dispersion and the limit dynamics remains complicated (chaotic). Finally, it is demonstrated in the third scenario that the dissipation mechanism is completely destroyed by the large dispersion, and that the diameter of the global attractor grows together with the growth of the dispersion parameter.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mathematics
Authors :
NameEmailORCID
Kostianko, Annaanna.kostianko@surrey.ac.uk
Titi, Edriss
Zelik, SergeyS.Zelik@surrey.ac.uk
Date : 7 November 2018
DOI : 10.1088/1361-6544/aae175
Copyright Disclaimer : Copyright 2018 IOP Publishing. This is the accepted version of the following article: Kostianko, Anna, Titi, Edriss and Zelik, Sergey (2018) Large dispersion, averaging and attractors: three 1D paradigms Nonlinearity, 31 (12), R317, which has been published in final form at http://iopscience.iop.org/article/10.1088/1361-6544/aae175/meta
Uncontrolled Keywords : Dissipative systems; Large dispersion; Singular perturbation; Attractors; Averaging
Depositing User : Clive Harris
Date Deposited : 10 Oct 2018 14:26
Last Modified : 12 Dec 2018 15:15
URI: http://epubs.surrey.ac.uk/id/eprint/849634

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