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

S. Föller (), R. Kaess () and W. Polifke ()
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S. Föller: TU München, Lehrstuhl für Thermodynamik
R. Kaess: Astrium GmbH, Space Transportation
W. Polifke: TU München, Lehrstuhl für Thermodynamik

A chapter in High Performance Computing in Science and Engineering, Garching/Munich 2009, 2010, pp 243-254 from Springer

Abstract: 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.

Keywords: Mach Number; Acoustic Wave; Shear Layer; Free Shear Layer; Acoustic Scattering (search for similar items in EconPapers)
Date: 2010
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-642-13872-0_21

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DOI: 10.1007/978-3-642-13872-0_21

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