On determining the thermal state of individual atoms in molecular dynamics simulations of nonequilibrium processes in solids


Fu Y., Kirca M. , To A. C.

CHEMICAL PHYSICS LETTERS, vol.506, pp.290-297, 2011 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 506
  • Publication Date: 2011
  • Doi Number: 10.1016/j.cplett.2011.03.012
  • Title of Journal : CHEMICAL PHYSICS LETTERS
  • Page Numbers: pp.290-297

Abstract

An ensemble average approach is proposed for determining the temperature and thermal equilibrium state of individual atoms in solids modeled using nonequilibrium molecular dynamics simulations (NEMD). The basic assumption of the approach is that the atomic velocity of an atom is the sum of a mean mechanical velocity and a random thermal velocity, which can be separated by performing ensemble average of many realizations of the same ensemble. Mechanical and thermal energy field obtained from the decomposed thermal and mechanical velocity together with the thermal velocity distribution reveal the details of energy transfer in these nonequilibrium processes. (C) 2011 Elsevier B. V. All rights reserved.