Nonclassical Dense Gas Flows for Simple Geometries

Two-dimensional shock wave reflection and refraction phenomena for dense gases in the high pressure and density region near the thermodynamic critical point are compared and contrasted to shock phenomena over well-known configurations for dilute, perfect gases. Both transient and steady wave fields are simulated using a time-accurate, predictor-corrector total variation diminishingscheme that solves the Euler equations incorporating the van der Waals thermodynamic model. Detailed displays of wave field structure for both perfect gas and dense gas flowfields are shown. Nonclassical wave phenomena, such as disintegrating shocks, expansion shocks, and shock-fan composite waves for wedges, ramps, circular arcs, and other geometries, demonstrate significant differences in dense gas flowfields from those of perfect gases