Comparison of three large-eddy simulations of shock-induced turbulent separation bubbles |
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Authors: | Emile Touber Neil D Sandham |
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Institution: | 1. University of Southampton, Southampton, SO17 1BJ, UK
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Abstract: | Three different large-eddy simulation investigations of the interaction between an impinging oblique shock and a supersonic
turbulent boundary layer are presented. All simulations made use of the same inflow technique, specifically aimed at avoiding
possible low-frequency interferences with the shock/boundary-layer interaction system. All simulations were run on relatively
wide computational domains and integrated over times greater than twenty five times the period of the most commonly reported
low-frequency shock-oscillation, making comparisons at both time-averaged and low-frequency-dynamic levels possible. The results
confirm previous experimental results which suggested a simple linear relation between the interaction length and the oblique-shock
strength if scaled using the boundary-layer thickness and wall-shear stress. All the tested cases show evidences of significant
low-frequency shock motions. At the wall, energetic low-frequency pressure fluctuations are observed, mainly in the initial
part of interaction. |
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Keywords: | |
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