Details

Autor(en) / Beteiligte

• Barclay, Paul L.
• Zhang, Duan Z.

Titel

Periodic boundary conditions for arbitrary deformations in molecular dynamics simulations

Ist Teil von

• Journal of computational physics, 2021-06, Vol.435, p.110238, Article 110238

Ort / Verlag

Cambridge: Elsevier Inc

Erscheinungsjahr

2021

Quelle

ScienceDirect

Beschreibungen/Notizen

• A generalization of the Lees-Edwards periodic boundary conditions (gLE-PBC) for molecular dynamics (MD) simulations is developed to allow for arbitrary deformations to be applied to the domain. The gLE-PBC domain remains a rectangular cuboid regardless of the applied deformation in contrast with the Lagrangian-rhomboid periodic boundary conditions (LR-PBC) where the domain deforms according to the applied deformation. The kinematics of gLE-PBC are validated against pure shear. The gLE-PBC method for interacting systems is then validated against the LR-PBC method and analytical solutions for a solid under isotropic compression, one-dimensional shearing, three-dimensional extension and shearing and for a liquid under Couette flow. Bulk physical properties extracted from the gLE-PBC simulations agree well with values calculated from equilibrium MD simulations. Three dimensional shearing and a deformation with a full velocity gradient matrix are also simulated, showing the range of problems gLE-PBC can explore.