title: Energy and pressure of shearing fluids at different state points.
abstract: Nonequilibrium molecular dynamics simulations are reported at different strain rates (gamma) and thermodynamic state points for a shearing atomic fluid interacting via a Lennard-Jones potential. Our simulations are performed at the Lennard-Jones triple point, a point midway between the triple point and the critical point, and a high point closer to the critical temperature. We find that, for the mid-point and high point, the energy and hydrostatic pressures have strain-rate dependencies of gamma(2), in contrast to the gamma(3/2) dependencies predicted by mode coupling theory. This analytical dependence is consistent with a Taylor series expansion of these quantities as powers of the strain rate tensor. Only at the triple point does the pressure and energy display a nonanalytical dependence on gamma(3/2).
authors.affiliation: Centre for Molecular Simulation and School of Information Technology, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia.
authors.forename: J
authors.initials: J
authors.lastname: Ge
authors.forename: G
authors.initials: G
authors.lastname: Marcelli
authors.forename: B D
authors.initials: BD
authors.lastname: Todd
authors.forename: R J
authors.initials: RJ
authors.lastname: Sadus