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首页> 外文期刊>Applied Mathematical Modelling >Finite difference/Hermite-Galerkin spectral method for multi-dimensional time-fractional nonlinear reaction-diffusion equation in unbounded domains
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Finite difference/Hermite-Galerkin spectral method for multi-dimensional time-fractional nonlinear reaction-diffusion equation in unbounded domains

机译:无限域中多维时间 - 分数非线性反应扩散方程的有限差分/ Hermite-Galerkin光谱法

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The aim of this paper is to develop an efficient finite difference/Hermite-Galerkin spectral method for the time-fractional nonlinear reaction-diffusion equation in unbounded domains with one, two, and three spatial dimensions. For this purpose, we employ the L2 - 1(sigma) formula to discretize the temporal Caputo derivative. Additionally, we apply the Hermite-Galerkin spectral method with scaling factor for the approximation in space. The stability of the fully discrete scheme is established to show that our method is unconditionally stable. Numerical experiments including one-, two-, and three-dimensional cases of the problem are carried out to verify the accuracy of our scheme. The scheme is showcased by solving two problems of practical interest, including the fractional Allen-Cahn and Gray-Scott models, together with an analysis of the properties of the fractional orders. (C) 2019 Elsevier Inc. All rights reserved.
机译:本文的目的是开发一种高效的有限差分/ Hermite-Galerkin光谱法,其具有一个,两个和三个空间尺寸的无界畴中的时间分数非线性反应扩散方程。为此目的,我们采用L2 - 1(Sigma)公式来离散时间Caputo衍生物。另外,我们应用Hermite-Galerkin光谱法,具有空间近似的缩放因子。建立完全离散方案的稳定性,表明我们的方法无条件稳定。在进行中包括一个,两维和三维案例的数值实验,以验证我们方案的准确性。通过解决实际兴趣的两个问题,包括分数艾伦 - CAHN和灰·斯科特型号的两个问题,以及分析分数令的性质。 (c)2019 Elsevier Inc.保留所有权利。

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