Numerical modeling of the initial stage of the generation of unsteady vortices from sharp corner in plane compressible flow
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The impingement of a plane shock wave in air on a rectangular or triangular obstacle is simulated numerically with high resolution TVD (total variation diminishing) scheme in finite volume formulation with Schwarz transformation in mesh generation. The mesh lines are quite adaptive to the physical features of the unsteady flow field and concentrate locally near the corners. At the initial stage the flow field is complex, and the scale of viscous diffusion is very small and the viscosity of fluid in computation may be neglected. The unsteady generation of concerntrated vortices downstream of the sharp corner as the result of the nonnuiformity of both temperature and entropy fields in plane inviscid compressible fluid, induced by bow shock wave, is shown clearly and in accordance with optical measurements, performed by our request.
Key wordsshock wave generation of vortices finite volume TVD scheme mesh generation
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