The numerical simulation of the reflected-shock/boundary-layer interaction in shock tubes.

摘要

The reflection of a normal shock wave from the end wall of a two-dimensional channel has been numerically simulated to investigate the unsteady, viscous interaction aspects of shock bifurcation. The numerical simulation implements a data-parallel version of the Flux-Corrected Transport algorithm which has been modified to include the viscous transport terms of the Navier-Stokes equations. All numerical simulations were performed on a massively parallel computer, Thinking Machines' CM-5 Connection Machine. This study focuses on the strong interaction between the reflected shock and the laminar boundary layer. The results of this investigation suggest that the shear layer in the bifurcation region is unstable. This instability leads to an irregular displacement surface over which the outer inviscid flow must travel. The inviscid flow adjacent to the viscous layer travels at high speed and as it changes direction to remain parallel to the displacement surface weak shock and expansion waves are generated and a reattachment shock is formed at the trailing edge of the interaction region. The impact of heat transfer, Reynolds number, incident shock strength and chemical dissociation on the viscous interaction was investigated as well. Heat transfer was found to weaken the interaction. However, decreased Reynolds number, increased shock strength and chemical dissociation were all found to strengthen the interaction between the reflected shock and the boundary layer.