NDLI: Large-eddy simulation of low-frequency unsteadiness in a turbulent shock-induced separation bubble

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Large-eddy simulation of low-frequency unsteadiness in a turbulent shock-induced separation bubble

Content Provider	Semantic Scholar
Author	Touber, Emile Sandham, Neil D.
Copyright Year	2009
Abstract	The need for better understanding of the low-frequency unsteadiness observed in shock wave/turbulent boundary layer interactions has been driving research in this area for several decades. We present here a large-eddy simulation investigation of the interaction between an impinging oblique shock and a Mach 2.3 turbulent boundary layer. Contrary to past large-eddy simulation investigations on shock/turbulent boundary layer interactions, we have used an inflow technique which does not introduce any energetically significant low frequencies into the domain, hence avoiding possible interference with the shock/boundary layer interaction system. The large-eddy simulation has been run for much longer times than previous computational studies making a Fourier analysis of the low frequency possible. The broadband and energetic low-frequency component found in the interaction is in excellent agreement with the experimental findings. Furthermore, a linear stability analysis of the mean flow was performed and a stationary unstable global mode was found. The long-run large-eddy simulation data were analyzed and a phase change in the wall pressure fluctuations was related to the global-mode structure, leading to a possible driving mechanism for the observed low-frequency motions.
Starting Page	79
Ending Page	107
Page Count	29
File Format	PDF HTM / HTML
DOI	10.1007/s00162-009-0103-z
Volume Number	23
Alternate Webpage(s)	https://eprints.soton.ac.uk/66710/1/Touber_Sandham.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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