Optimized Constant Pressure Stochastic Dynamics

Details Optimized Constant Pressure Stochastic Dynamics Optimized Constant Pressure Stochastic Dynamics

1999-03-29

arxiv.org/abs/cond-mat/9903423v1

Physics

Condensed Matter

Soft Condensed Matter

16 pages, 2 figures, submitted to J. Chem. Phys

Scientific paper

10.1063/1.479208

A recently proposed method for computer simulations in the isothermal-isobaric (NPT) ensemble, based on Langevin-type equations of motion for the particle coordinates and the ``piston'' degree of freedom, is re-derived by straightforward application of the standard Kramers-Moyal formalism. An integration scheme is developed which reduces to a time-reversible symplectic integrator in the limit of vanishing friction. This algorithm is hence expected to be quite stable for small friction, allowing for a large time step. We discuss the optimal choice of parameters, and present some numerical test results.

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