| The interaction between a shock wave and boundary layer along a wall surface in internalcompressible flows causes a very complicated flow structure, at the same time influences the structureof shock/boundary-layer interactions. A numerical study of an oscillating normal shock wave subjectto downstream pressure oscillations in a2D channel flow has been conducted in this paper. Theunsteady shock motion caused by downstream oscillations has been observed and unsteady transonicshock and turbulent boundary-layer interaction have been investigated.Numerical simulations of thechannel flow were made by means of a two-dimensional unsteady Reynolds averaged Navier-Stokessolver using a two-equation transport turbulence model. It is solved by the finite volume approach,moving grid model and so on. In this simulation, the continuously rotating wheel at the outlet couldchange the area of cross section of channel so that the pressure at the outlet was periodic oscillating.Based on the fundamentals of one-dimension gas dynamics and acoustic theory, a formula forpredicting the amplitude of shock motion is deduced. The simulated results have good agreementswith the experiment results. The flowing pattern changes with the shock oscillation. Classifying theshock wave-boundary-layer interaction from the cross section helps to analysis the unsteady flow.Relative Mach number and oscillating adverse pressure gradient can influence the unsteady shockwave-boundary-layer interactions. |
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