Turing pattern dynamics and adaptive discretization for a super-diffusive Lotka-Volterra model
Turing pattern dynamics and adaptive discretization for a super-diffusive Lotka-Volterra model
复制标题
超扩散 Lotka-Volterra 模型的图灵模式动力学和自适应离散化
DOI:
10.1007/s00285-015-0917-9
复制
发表时间:
2015-07
影响因子:
1.9
通讯作者:
Canrong Tian
中科院分区:
文献类型:
--
作者:
Mostafa Bendahmane;Ricardo Ruiz-Baier;Canrong Tian
In this paper we analyze the effects of introducing the fractional-in-space operator into a Lotka-Volterra competitive model describing population super-diffusion. First, we study how cross super-diffusion influences the formation of spatial patterns: a linear stability analysis is carried out, showing that cross super-diffusion triggers Turing instabilities, whereas classical (self) super-diffusion does not. In addition we perform a weakly nonlinear analysis yielding a system of amplitude equations, whose study shows the stability of Turing steady states. A second goal of this contribution is to propose a fully adaptive multiresolution finite volume method that employs shifted Grünwald gradient approximations, and which is tailored for a larger class of systems involving fractional diffusion operators. The scheme is aimed at efficient dynamic mesh adaptation and substantial savings in computational burden. A numerical simulation of the model was performed near the instability boundaries, confirming the behavior predicted by our analysis.
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DOI:
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