Effective thermostat induced by coarse-graining of SPC water

Details Effective thermostat induced by coarse-graining of SPC water Effective thermostat induced by coarse-graining of SPC water

2008-02-08

arxiv.org/abs/0802.1157v1

A. Eriksson, M. N. Jacobi, J. Nystrom, and K. Tunstrom, J. Chem. Phys. 129, 024106 (2008)

Physics

Chemical Physics

8 pages

Scientific paper

10.1063/1.2953320

We investigate how the transport properties of a united atoms fluid with a dissipative particle dynamics thermostat depend on the functional form and magnitude of both the conservative and the stochastic interactions. We demonstrate how the thermostat strongly affects the hydrodynamics, especially diffusion, viscosity, and local escape times. As model system we use SPC water, from which projected trajectories are used to determine the effective interactions in the united atoms model. The simulation results support our argument that the thermostat should be viewed as an integral part of the coarse-grained dynamics, rather than a tool for approaching thermal equilibrium. As our main result we show that the united atoms model with the adjusted effective interactions approximately reproduce the diffusion constant and the viscosity of the underlying detailed SPC water model.

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