Wavelet analysis of supersonic shock-boundary-layer interaction

Ioannis W. Kokkinakis; George Khujadze; Dimitris Drikakis; S. Michael Spottswood

doi:10.1063/5.0153863

Wavelet analysis of supersonic shock-boundary-layer interaction

Ioannis W. Kokkinakis, George Khujadze, Dimitris Drikakis, S. Michael Spottswood

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Abstract

We present a wavelet analysis of supersonic shock-boundary-layer interaction. We have used direct numerical simulation data for supersonic flow over a compression ramp and performed orthogonal anisotropic wavelets. The wavelet-based method of extracting coherent structures is applied to the flow vorticity field, decomposed into coherent and incoherent contributions using thresholding of the wavelet coefficients. The statistics of the coherent part of vorticity are close to the statistics of the total field. The study aims to improve our understanding of the shock-boundary-layer interaction, the role of vorticity, and the relationship between the flow's coherent and incoherent vorticity components with the near-wall sound. Our analysis shows a substantial correlation between the incoherent part of vorticity components and wall-pressure fluctuations.

Original language	English
Article number	066106
Journal	Physics of Fluids
Volume	35
Issue number	6
DOIs	https://doi.org/10.1063/5.0153863
Publication status	Published - 1 Jun 2023

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title = "Wavelet analysis of supersonic shock-boundary-layer interaction",

abstract = "We present a wavelet analysis of supersonic shock-boundary-layer interaction. We have used direct numerical simulation data for supersonic flow over a compression ramp and performed orthogonal anisotropic wavelets. The wavelet-based method of extracting coherent structures is applied to the flow vorticity field, decomposed into coherent and incoherent contributions using thresholding of the wavelet coefficients. The statistics of the coherent part of vorticity are close to the statistics of the total field. The study aims to improve our understanding of the shock-boundary-layer interaction, the role of vorticity, and the relationship between the flow's coherent and incoherent vorticity components with the near-wall sound. Our analysis shows a substantial correlation between the incoherent part of vorticity components and wall-pressure fluctuations.",

author = "Kokkinakis, {Ioannis W.} and George Khujadze and Dimitris Drikakis and Spottswood, {S. Michael}",

note = "Funding Information: This material is based upon work supported by the Air Force Office of Scientific Research under Award Nos. FA8655-22-1-7026 and FA9550-19-1-7018. S.M.S. and D.D. would like to thank Dr. David Swanson (Air Force Office of Scientific Research—European Office of Aerospace) for his support. The funding was awarded to D.D. through the University of Nicosia Research Foundation. G.K. acknowledges M. Farge and K. Schneider for their insightful discussions regarding the wavelet theory over the years. Publisher Copyright: {\textcopyright} 2023 Author(s).",

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doi = "10.1063/5.0153863",

language = "English",

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AU - Kokkinakis, Ioannis W.

AU - Khujadze, George

AU - Drikakis, Dimitris

AU - Spottswood, S. Michael

N1 - Funding Information: This material is based upon work supported by the Air Force Office of Scientific Research under Award Nos. FA8655-22-1-7026 and FA9550-19-1-7018. S.M.S. and D.D. would like to thank Dr. David Swanson (Air Force Office of Scientific Research—European Office of Aerospace) for his support. The funding was awarded to D.D. through the University of Nicosia Research Foundation. G.K. acknowledges M. Farge and K. Schneider for their insightful discussions regarding the wavelet theory over the years. Publisher Copyright: © 2023 Author(s).

PY - 2023/6/1

Y1 - 2023/6/1

N2 - We present a wavelet analysis of supersonic shock-boundary-layer interaction. We have used direct numerical simulation data for supersonic flow over a compression ramp and performed orthogonal anisotropic wavelets. The wavelet-based method of extracting coherent structures is applied to the flow vorticity field, decomposed into coherent and incoherent contributions using thresholding of the wavelet coefficients. The statistics of the coherent part of vorticity are close to the statistics of the total field. The study aims to improve our understanding of the shock-boundary-layer interaction, the role of vorticity, and the relationship between the flow's coherent and incoherent vorticity components with the near-wall sound. Our analysis shows a substantial correlation between the incoherent part of vorticity components and wall-pressure fluctuations.

AB - We present a wavelet analysis of supersonic shock-boundary-layer interaction. We have used direct numerical simulation data for supersonic flow over a compression ramp and performed orthogonal anisotropic wavelets. The wavelet-based method of extracting coherent structures is applied to the flow vorticity field, decomposed into coherent and incoherent contributions using thresholding of the wavelet coefficients. The statistics of the coherent part of vorticity are close to the statistics of the total field. The study aims to improve our understanding of the shock-boundary-layer interaction, the role of vorticity, and the relationship between the flow's coherent and incoherent vorticity components with the near-wall sound. Our analysis shows a substantial correlation between the incoherent part of vorticity components and wall-pressure fluctuations.

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DO - 10.1063/5.0153863

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VL - 35

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JF - Physics of Fluids

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M1 - 066106

ER -

Wavelet analysis of supersonic shock-boundary-layer interaction

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