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An airborne acoustic method to reconstruct a dynamically rough flow surface

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Abstract
Currently, there is no airborne in situ method to reconstruct with high fidelity the instantaneous elevation of a dynamically rough surface of a turbulent flow. This work proposes a holographic method that reconstructs the elevation of a one-dimensional rough water surface from airborne acoustic pressure data. This method can be implemented practically using an array of microphones deployed over a dynamically rough surface or using a single microphone which is traversed above the surface at a speed that is much higher than the phase velocity of the roughness pattern. In this work, the theory is validated using synthetic data calculated with the Kirchhoff approximation and a finite difference time domain method over a number of measured surface roughness patterns. The proposed method is able to reconstruct the surface elevation with a sub-millimeter accuracy and over a representatively large area of the surface. Since it has been previously shown that the surface roughness pattern reflects accurately the underlying hydraulic processes in open channel flow [e.g., Horoshenkov, Nichols, Tait, and Maximov, J. Geophys. Res. 118(3), 1864-1876 (2013)], the proposed method paves the way for the development of non-invasive instrumentation for flow mapping and characterization that are based on the acoustic holography principle. (C) 2016 Acoustical Society of America.
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Citation

Please use this url to cite or link to this publication:

Chicago
Krynkin, Anton, Kirill V Horoshenkov, and Timothy Van Renterghem. 2016. “An Airborne Acoustic Method to Reconstruct a Dynamically Rough Flow Surface.” Journal of the Acoustical Society of America 140 (3): 2064–2073.
APA
Krynkin, A., Horoshenkov, K. V., & Van Renterghem, T. (2016). An airborne acoustic method to reconstruct a dynamically rough flow surface. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 140(3), 2064–2073.
Vancouver
1.
Krynkin A, Horoshenkov KV, Van Renterghem T. An airborne acoustic method to reconstruct a dynamically rough flow surface. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA. Melville: Acoustical Soc Amer Amer Inst Physics; 2016;140(3):2064–73.
MLA
Krynkin, Anton, Kirill V Horoshenkov, and Timothy Van Renterghem. “An Airborne Acoustic Method to Reconstruct a Dynamically Rough Flow Surface.” JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 140.3 (2016): 2064–2073. Print.
@article{8508218,
  abstract     = {Currently, there is no airborne in situ method to reconstruct with high fidelity the instantaneous elevation of a dynamically rough surface of a turbulent flow. This work proposes a holographic method that reconstructs the elevation of a one-dimensional rough water surface from airborne acoustic pressure data. This method can be implemented practically using an array of microphones deployed over a dynamically rough surface or using a single microphone which is traversed above the surface at a speed that is much higher than the phase velocity of the roughness pattern. In this work, the theory is validated using synthetic data calculated with the Kirchhoff approximation and a finite difference time domain method over a number of measured surface roughness patterns. The proposed method is able to reconstruct the surface elevation with a sub-millimeter accuracy and over a representatively large area of the surface. Since it has been previously shown that the surface roughness pattern reflects accurately the underlying hydraulic processes in open channel flow [e.g., Horoshenkov, Nichols, Tait, and Maximov, J. Geophys. Res. 118(3), 1864-1876 (2013)], the proposed method paves the way for the development of non-invasive instrumentation for flow mapping and characterization that are based on the acoustic holography principle. (C) 2016 Acoustical Society of America.},
  author       = {Krynkin, Anton and Horoshenkov, Kirill V and Van Renterghem, Timothy},
  issn         = {0001-4966},
  journal      = {JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA},
  language     = {eng},
  number       = {3},
  pages        = {2064--2073},
  publisher    = {Acoustical Soc Amer Amer Inst Physics},
  title        = {An airborne acoustic method to reconstruct a dynamically rough flow surface},
  url          = {http://dx.doi.org/10.1121/1.4962559},
  volume       = {140},
  year         = {2016},
}

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