Non-reflecting boundary conditions for atomistic, continuum and coupled atomistic/continuum simulations

Harold S. Park, Eduard G. Karpov, Wing Kam Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

We present a method to numerically calculate a non-reflecting boundary condition which is applicable to atomistic, continuum and coupled multiscale atomistic/continuum simulations. The method is based on the assumption that the forces near the domain boundary can be well represented as a linear function of the displacements, and utilizes standard Laplace and Fourier transform techniques to eliminate the unnecessary degrees of freedom. The eliminated degrees of freedom are accounted for in a time-history kernel that can be calculated for arbitrary crystal lattices and interatomic potentials, or regular finite element meshes using an automated numerical procedure. The new theoretical developments presented in this work allow the application of the method to non-nearest neighbour atomic interactions; it is also demonstrated that the identical procedure can be used for finite element and mesh-free simulations. We illustrate the effectiveness of the method on a one-dimensional model problem, and calculate the time-history kernel for FCC gold using the embedded atom method (EAM).

Original languageEnglish (US)
Pages (from-to)237-259
Number of pages23
JournalInternational Journal for Numerical Methods in Engineering
Volume64
Issue number2
DOIs
StatePublished - Sep 14 2005

Keywords

  • Coupling methods
  • Finite elements
  • Generalized Langevin equation
  • Molecular dynamics
  • Multiple scales
  • Non-reflecting boundary condition

ASJC Scopus subject areas

  • Numerical Analysis
  • Engineering(all)
  • Applied Mathematics

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