Upstream and Downstream Influence on Stbli Unsteadiness
نویسندگان
چکیده
Direct numerical simulation data of a 24 compression ramp configuration are used to analyze the shock motion. The characteristic frequencies in the incoming boundary layer are reported for reference. The shock wave motion exhibits high-frequency spanwise wrinkling, as well as low-frequency streamwise motion. Correlations between the incoming flow and the shock motions, as well as the downstream flow and the shock unsteadiness are investigated. In addition, analyses show that the unsteadiness of the separation bubble correlates with lowfrequency shock motion, giving a Strouhal number of 0.8 based on the low-frequency of the shock motion, the length of the separation bubble and the averaged maximum velocity of
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