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Analysis of unsteady behaviour in shockwave turbulent boundary layer interaction

Published online by Cambridge University Press:  28 February 2012

Muzio Grilli ,
Peter J. Schmid ,
Stefan Hickel  and
Nikolaus A. Adams
Muzio Grilli*
Affiliation:
Institute of Aerodynamics and Fluid Mechanics, Technische Universität München, D-85748 Garching, Germany
Peter J. Schmid
Affiliation:
Laboratoire d’Hydrodynamique (LadHyX), CNRS-École Polytechnique, 91128 Palaiseau, France
Stefan Hickel
Affiliation:
Institute of Aerodynamics and Fluid Mechanics, Technische Universität München, D-85748 Garching, Germany
Nikolaus A. Adams
Affiliation:
Institute of Aerodynamics and Fluid Mechanics, Technische Universität München, D-85748 Garching, Germany
*
†Email address for correspondence: [email protected]
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Abstract

The unsteady behaviour in shockwave turbulent boundary layer interaction is investigated by analysing results from a large eddy simulation of a supersonic turbulent boundary layer over a compression–expansion ramp. The interaction leads to a very-low-frequency motion near the foot of the shock, with a characteristic frequency that is three orders of magnitude lower than the typical frequency of the incoming boundary layer. Wall pressure data are first analysed by means of Fourier analysis, highlighting the low-frequency phenomenon in the interaction region. Furthermore, the flow dynamics are analysed by a dynamic mode decomposition which shows the presence of a low-frequency mode associated with the pulsation of the separation bubble and accompanied by a forward–backward motion of the shock.

JFM classification

Compressible Flows: Compressible boundary layers Compressible Flows: Shock waves
Type
Papers
Information
Journal of Fluid Mechanics , Volume 700 , 10 June 2012 , pp. 16 - 28
Copyright
Copyright © Cambridge University Press 2012

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Grilli et al. supplementary material

Animation of the reconstructed flow field by the four dominant modes. 11 contours of velocity are shown.

Download Grilli et al. supplementary material(Video)
Video 1.8 MB

Grilli et al. supplementary material

Animation of the reconstructed flow field by the four dominant modes. 11 contours of velocity are shown.

Download Grilli et al. supplementary material(Video)
Video 2.7 MB