期刊
JOURNAL OF COMPUTATIONAL PHYSICS
卷 332, 期 -, 页码 118-134出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcp.2016.11.028
关键词
Nonlocal diffusion operator; Peridynamic operator; Fourier spectral method; Nonlocal Allen-Cahn equation; Nonlocal Cahn-Hilliard equation; Nonlocal phase-field crystal model
资金
- U.S. NSF [DMS-1558744]
- AFOSR MURI center for material failure prediction through peridynamics
- ARO MURI [W911NF-15-1-0562]
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [1558744] Funding Source: National Science Foundation
This work is concerned with the Fourier spectral approximation of various integral differential equations associated with some linear nonlocal diffusion and peridynamic operators under periodic boundary conditions. For radially symmetric kernels, the nonlocal operators under consideration are diagonalizable in the Fourier space so that the main computational challenge is on the accurate and fast evaluation of their eigenvalues or Fourier symbols consisting of possibly singular and highly oscillatory integrals. For a large class of fractional power-like kernels, we propose a new approach based on reformulating the Fourier symbols both as coefficients of a series expansion and solutions of some simple ODE models. We then propose a hybrid algorithm that utilizes both truncated series expansions and high order Runge-Kutta ODE solvers to provide fast evaluation of Fourier symbols in both one and higher dimensional spaces. It is shown that this hybrid algorithm is robust, efficient and accurate. As applications, we combine this hybrid spectral discretization in the spatial variables and the fourth-order exponential time differencing Runge-Kutta for temporal discretization to offer high order approximations of some nonlocal gradient dynamics including nonlocal Allen-Cahn equations, nonlocal Cahn-Hilliard equations, and nonlocal phase-field crystal models. Numerical results show the accuracy and effectiveness of the fully discrete scheme and illustrate some interesting phenomena associated with the nonlocal models. (C) 2016 Elsevier Inc. All rights reserved.
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