Communications on Applied Mathematics and Computation ›› 2020, Vol. 2 ›› Issue (2): 261-303.doi: 10.1007/s42967-019-00051-8

• ORIGINAL PAPER • 上一篇    下一篇

Higher Order Collocation Methods for Nonlocal Problems and Their Asymptotic Compatibility

Burak Aksoylu1,2, Fatih Celiker2, George A. Gazonas1   

  1. 1 CCDC Army Research Laboratory, Attn: FCDD-RLW-MB, Aberdeen Proving Ground, Aberdeen, MD 21005, USA;
    2 Department of Mathematics, Wayne State University, Detroit, MI 48202, USA
  • 收稿日期:2019-05-22 修回日期:2019-10-01 出版日期:2020-06-20 发布日期:2020-02-19
  • 通讯作者: Burak Aksoylu, Fatih Celiker, George A. Gazonas E-mail:burak@wayne.edu;celiker@wayne.edu;george.a.gazonas.civ@mail.mil

Higher Order Collocation Methods for Nonlocal Problems and Their Asymptotic Compatibility

Burak Aksoylu1,2, Fatih Celiker2, George A. Gazonas1   

  1. 1 CCDC Army Research Laboratory, Attn: FCDD-RLW-MB, Aberdeen Proving Ground, Aberdeen, MD 21005, USA;
    2 Department of Mathematics, Wayne State University, Detroit, MI 48202, USA
  • Received:2019-05-22 Revised:2019-10-01 Online:2020-06-20 Published:2020-02-19
  • Contact: Burak Aksoylu, Fatih Celiker, George A. Gazonas E-mail:burak@wayne.edu;celiker@wayne.edu;george.a.gazonas.civ@mail.mil

摘要: We study the convergence and asymptotic compatibility of higher order collocation methods for nonlocal operators inspired by peridynamics, a nonlocal formulation of continuum mechanics. We prove that the methods are optimally convergent with respect to the polynomial degree of the approximation. A numerical method is said to be asymptotically compatible if the sequence of approximate solutions of the nonlocal problem converges to the solution of the corresponding local problem as the horizon and the grid sizes simultaneously approach zero. We carry out a calibration process via Taylor series expansions and a scaling of the nonlocal operator via a strain energy density argument to ensure that the resulting collocation methods are asymptotically compatible. We fnd that, for polynomial degrees greater than or equal to two, there exists a calibration constant independent of the horizon size and the grid size such that the resulting collocation methods for the nonlocal difusion are asymptotically compatible. We verify these fndings through extensive numerical experiments.

关键词: Nonlocal operator, Inhomogeneous local boundary condition, Nonlocal difusion, Asymptotic compatibility, Collocation method, Peridynamics, Functional calculus

Abstract: We study the convergence and asymptotic compatibility of higher order collocation methods for nonlocal operators inspired by peridynamics, a nonlocal formulation of continuum mechanics. We prove that the methods are optimally convergent with respect to the polynomial degree of the approximation. A numerical method is said to be asymptotically compatible if the sequence of approximate solutions of the nonlocal problem converges to the solution of the corresponding local problem as the horizon and the grid sizes simultaneously approach zero. We carry out a calibration process via Taylor series expansions and a scaling of the nonlocal operator via a strain energy density argument to ensure that the resulting collocation methods are asymptotically compatible. We fnd that, for polynomial degrees greater than or equal to two, there exists a calibration constant independent of the horizon size and the grid size such that the resulting collocation methods for the nonlocal difusion are asymptotically compatible. We verify these fndings through extensive numerical experiments.

Key words: Nonlocal operator, Inhomogeneous local boundary condition, Nonlocal difusion, Asymptotic compatibility, Collocation method, Peridynamics, Functional calculus

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