Computational fluid dynamics simulations were performed on four generic isolator configurations with aspect ratios of 1, 3, 6, and 9. Inflow conditions were supersonic flow at Mach 2 and Mach 3.2; outflow conditions represented 80% of the normal-shock pressure rise for the flow. The analysis focuses on the variation in shock train length and shape with isolator aspect ratio.
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Cox-Stouffer et al. (2001) studied this question.