The supersonic flow of a calorically perfect ideal gas past a two-dimensional blunt body was investigated. An unphysical anomaly known as the carbuncle phenomenon has been predicted by earlier studies of this flow that use so-called high resolution schemes which employ flux limiters within shock-capturing methods applied to the Euler equations. As a remedy, this study introduces physical momentum and energy diffusion via a simple discretization of the ordinary Navier-Stokes equations, employed on a sufficiently fine grid to capture viscous shocks. To check if this cures the anomaly, flow over a cylinder of radius a = 150 microns of viscous air with freestream Mach number M_1 = 5.73, pressure p_1 = 12.4272 Pa, and temperature T_1 = 39.667 K was simulated. The numerical solution was calculated with first order spatial and fourth order temporal discretizations, and it was seen that physical diffusion, appropriately resolved, removes the carbuncle phenomenon.
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