Rheological properties of simple fluids by computer simulation

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Abstract
We present results of nonequilibrium molecular-dynamics calculations for the triple-point Lennard-Jones fluid undergoing shear flow. The calculations show that this simple fluid exhibits a wide variety of non-Newtonian behavior ranging from viscoelasticity, to shear dilatancy and flow birefringence. It is shown that the constitutive relations describing these phenomena are consistent with nonanalytic functional forms. For every property so far studied these functional forms agree with those predicted by long-time tail theories. However, the size of each effect is found to be several orders of magnitude greater than theoretical predictions.