Coherent Structures in Nonlocal Dispersive Active-Dissipative Systems
Coherent Structures in Nonlocal Dispersive Active-Dissipative Systems
复制标题
非局域色散主动耗散系统中的相干结构
DOI:
10.1137/140970033
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发表时间:
2015
影响因子:
1.9
通讯作者:
Lin T
中科院分区:
文献类型:
--
作者:
Lin T
We analyze coherent structures in nonlocal dispersive active-dissipative nonlinear systems, using as a prototype the Kuramoto--Sivashinsky (KS) equation with an additional nonlocal term that contains stabilizing/destabilizing and dispersive parts. As for the local generalized Kuramoto--Sivashinsky (gKS) equation (see, e.g., [T. Kawahara and S. Toh,Phys. Fluids, 31 (1988), pp. 2103--2111]), we show that sufficiently strong dispersion regularizes the chaotic dynamics of the KS equation, and the solutions evolve into arrays of interacting pulses that can form bound states. We analyze the asymptotic characteristics of such pulses and show that their tails tend to zero algebraically but not exponentially, as for the local gKS equation. Since the Shilnikov-type approach is not applicable for analyzing bound states in nonlocal equations, we develop a weak-interaction theory and show that the standard first-neighbor approximation is no longer applicable. It is then essential to take into account long-range interactions due to the algebraic decay of the tails of the pulses. In addition, we find that the number of possible bound states for fixed parameter values is always finite, and we determine when there is long-range attractive or repulsive force between the pulses. Finally, we explain the regularizing effect of dispersion by showing that, as dispersion is increased, the pulses generally undergo a transition from absolute to convective instability. We also find that for some nonlocal operators, increasing the strength of the stabilizing/destabilizing term can have a regularizing/deregularizing effect on the dynamics.
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DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
J. González;S. Jiménez;A. Bellorin;L. E. Guerrero;L. Vázquez
通讯作者:
L. Vázquez
DOI:
--
发表时间:
2010
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
--
作者:
Eman Simbawa;P. Matthews;S. Cox
通讯作者:
S. Cox
影响因子:
1.9
作者:
D. Tseluiko;D. Papageorgiou
通讯作者:
D. Papageorgiou
影响因子:
2
作者:
Armstrong, Nicola J.;Painter, Kevin J.;Sherratt, Jonathan A.
通讯作者:
Sherratt, Jonathan A.
影响因子:
1.2
作者:
M. Chugunova;D. Pelinovsky
通讯作者:
D. Pelinovsky