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Determination of Acoustic Scattering Coefficients via Large Eddy Simulation and System Identification

In: High Performance Computing in Science and Engineering, Garching/Munich 2009

Author

Listed:
  • S. Föller

    (TU München, Lehrstuhl für Thermodynamik)

  • R. Kaess

    (Astrium GmbH, Space Transportation)

  • W. Polifke

    (TU München, Lehrstuhl für Thermodynamik)

Abstract

The scattering of acoustic waves at a sudden change in cross section in a duct system is investigated. In particular, a method is presented which allows to determine the coefficients of transmission and reflection of plane acoustic waves by combining large eddy simulation (LES) of turbulent compressible flow with system identification. The complex aero-acoustic interactions between acoustic waves and free shear layers are captured in detail, such that the scattering coefficients can be determined accurately from first principles. The method works as follows: First, a LES with external, broadband excitation of acoustic waves is carried out. Time series of acoustic data are extracted from the computed flow field and analyzed with system identification techniques to determine the acoustic scattering coefficients for a range of frequencies. The combination of broadband excitation with highly parallelized LES make the overall approach quite efficient, despite the difficulties associated with simulation of low-Mach number compressible flows.

Suggested Citation

  • S. Föller & R. Kaess & W. Polifke, 2010. "Determination of Acoustic Scattering Coefficients via Large Eddy Simulation and System Identification," Springer Books, in: Siegfried Wagner & Matthias Steinmetz & Arndt Bode & Markus Michael Müller (ed.), High Performance Computing in Science and Engineering, Garching/Munich 2009, pages 243-254, Springer.
    • Handle: RePEc:spr:sprchp:978-3-642-13872-0_21
    DOI: 10.1007/978-3-642-13872-0_21
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