Shock Wave Diffraction at a Sharp Edge and the Effect of Baffles in a Shock Tube,
IMPERIAL COLL OF SCIENCE AND TECHNOLOGY LONDON (ENGLAND) DEPT OF AERONAUTICS
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The diffraction of a shock wave round a sharp two-dimensional edge is studied numerically using the Fluid-in-Cell method with flux corrected transport. The alternative possibility of a shock fitting technique to this problem in order to reduce numerical diffusion is also discussed briefly. In the case of shocks with subsonic post-shock flow comparisons are made with an isentropic weak wave diffraction theory including the effect of the vorticity shed from the edge. When this vorticity is included, good agreement is obtained between the two different methods of solution for the weaker shocks. Numerical results are also presented for strong shocks, with supersonic post-shock flow. In this case some comparison with quasi-steady theory is possible. These comparisons are presented as a validation of the general numerical technique in dealing with diffraction type problems. The paper also deals with the propagation of a shock wave through a succession of axisymmetric orifice plates in a long tube.