Spatially discrete reaction–diffusion equations with discontinuous hysteresis
Spatially discrete reaction–diffusion equations with discontinuous hysteresis
复制标题
具有不连续滞后的空间离散反应扩散方程
DOI:
10.1016/j.anihpc.2017.09.006
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Tikhomirov S.
中科院分区:
文献类型:
--
作者:
Gurevich P;Tikhomirov S.
We address the question: Why may reaction–diffusion equations with hysteretic nonlinearities become ill-posed and how to amend this? To do so, we discretize the spatial variable and obtain a lattice dynamical system with a hysteretic nonlinearity. We analyze a new mechanism that leads to appearance of a spatio-temporal pattern called rattling: the solution exhibits a propagation phenomenon different from the classical traveling wave, while the hysteretic nonlinearity, loosely speaking, takes a different value at every second spatial point, independently of the grid size. Such a dynamics indicates how one should redefine hysteresis to make the continuous problem well-posed and how the solution will then behave. In the present paper, we develop main tools for the analysis of the spatially discrete model and apply them to a prototype case. In particular, we prove that the propagation velocity is of order a t− 1/2 as t→∞ and explicitly find the rate a.
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DOI:
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发表时间:
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DOI:
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发表时间:
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作者:
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