Numerical Simulation of Separated Unsteady Flows of Viscous Compressible Gas
The unsteady flow of the compressible viscous gas past two coaxial cylinders put together (Fig. 1) is investigated using the implicit iterative scheme  for full unsteady Navier-Stokes equations. It is shown that the flow picture in the recirculation region depends on the amplitude and the frequency of the oscillations of freestream parameters. The critical value of amplitude is determined at which the recirculation flow is destroyed. The aerodynamic performances are determined as the functions of the parameters governing the unsteady process in the freestream.
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