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Additive noise effects in active nonlinear spatially extended systems

Published online by Cambridge University Press:  17 May 2012

M. PRADAS ,
G.A. PAVLIOTIS ,
S. KALLIADASIS ,
D.T. PAPAGEORGIOU  and
D. TSELUIKO
M. PRADAS
Affiliation:
Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK email: [email protected], [email protected]
G.A. PAVLIOTIS
Affiliation:
Department of Mathematics, Imperial College London, London, SW7 2AZ, UK email: [email protected], [email protected]
S. KALLIADASIS
Affiliation:
Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK email: [email protected], [email protected]
D.T. PAPAGEORGIOU
Affiliation:
Department of Mathematics, Imperial College London, London, SW7 2AZ, UK email: [email protected], [email protected]
D. TSELUIKO
Affiliation:
School of Mathematics, Loughborough University, Leicestershire, LE11 3TU, UK email: [email protected]
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Abstract

We examine the effects of pure additive noise on spatially extended systems with quadratic nonlinearities. We develop a general multi-scale theory for such systems and apply it to the Kuramoto–Sivashinsky equation as a case study. We first focus on a regime close to the instability onset (primary bifurcation), where the system can be described by a single dominant mode. We show analytically that the resulting noise in the equation describing the amplitude of the dominant mode largely depends on the nature of the stochastic forcing. For a highly degenerate noise, in the sense that it is acting on the first stable mode only, the amplitude equation is dominated by a pure multiplicative noise, which in turn induces the dominant mode to undergo several critical state transitions and complex phenomena, including intermittency and stabilisation, as the noise strength is increased. The intermittent behaviour is characterised by a power-law probability density and the corresponding critical exponent is calculated rigorously by making use of the first-passage properties of the amplitude equation. On the other hand, when the noise is acting on the whole subspace of stable modes, the multiplicative noise is corrected by an additive-like term, with the eventual loss of any stabilised state. We also show that the stochastic forcing has no effect on the dominant mode dynamics when it is acting on the second stable mode. Finally, in a regime which is relatively far from the instability onset so that there are two unstable modes, we observe numerically that when the noise is acting on the first stable mode, both dominant modes show noise-induced complex phenomena similar to the single-mode case.

Keywords

Stochastic partial differential equationsCritical phenomenaMultiple scale methodsSingular perturbations
Type
Papers
Information
European Journal of Applied Mathematics , Volume 23 , Issue 5 , October 2012 , pp. 563 - 591
Copyright
Copyright © Cambridge University Press 2012

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