Analytic dependence of the pressure and energy of an atomic fluid under shear - art. no. 021204

Nonequilibrium molecular dynamics simulations are reported at different str ain rates (gamma) over dot) for a shearing atomic fluid interacting via acc urate two- and three-body potentials. We report that the hydrostatic pressu re has a strain-rate dependence of (gamma) over dot(2), in contrast to the (gamma) over dot(3/2) dependence predicted by mode-coupling theory. Our res ults indicate that the pressure and energy of real fluids may display an an alytic dependence on the strain rate. This is in contrast to previous work using either Lennard-Jones or Weeks-Chandler-Anderson potentials that had s hown a (gamma) over dot(3/2) dependence of pressure and energy.