A computational study of the effects of a discrete roughness element on high-speed boundary layers is investigated. Four cases are studied with one set based on the flow conditions during the ascent phase of the Hypersonic International Flight Research Experimentation Flight 1. Results that are presented include a two-dimensional stability analysis of the cone geometry without roughness and four high fidelity simulations with the diamond-shaped roughness element. Reynolds number effects on the wake pattern are compared in addition to a preliminary comparison between second-order accurate and sixth-order accurate computational results.
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