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Molecular Simulation/Transport properties

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Viscosity

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The viscosity of a liquid is defined by the drag force experienced by a moving plate separated from a stationary plate by a layer of the liquid.

u is the speed of the moving plate. h is distance by which the two plates are separated. A is the surface area of the moving plate.

can be calculated from a molecular dynamics simulation using the Green–Kubo relation,

Pxy is the xy component of the pressure tensor. The xz or yx off-diagonal components can be used instead.

Thermal Conductivity

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The thermal conductivity of a liquid is defined by the rate of heat transfer between an upper and lower plate at different temperatures (T1 and T2).

The Green-Kubo relation for thermal conductivity relates lambda to the autocorrelation function of the heat current,

See Also

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Wikipedia:Viscosity Wikipedia:Green–Kubo_relations