Gareth J. Bennett, Ciarán O'Reilly, Ulf Tapken, Hao Liu, Modelling multi-modal sound transmission from point sources in ducts with flow using a wave-based method, 16th International Congress on Sound and Vibration (ICSV16), Kraków, Poland, 5-9 July 2009, 2009
An understanding of the multi-modal propagation of acoustic waves in ducts is of practical
interest for use in the control of noise in, for example, aero-engines, automotive exhaust and
ventilation systems. In this paper, the propagation of sound from point sources in hard-walled
ducts is modelled using a numerical wave-based approach, referred to as the wave expansion
method. This is a highly efficient full-domain discretisation method, which requires as few
as two-to-three mesh points per wavelength. An inhomogeneous potential flow may be easily
included in the method. The numerical solution for point sources embedded in the wall of a
circular duct with non-reflective end-conditions and a uniform axial flow is compared with an
analytical Green’s function solution. A modal decomposition technique is used to provide detailed
information about the modal content of the sound field. This study provides an insightful
comparison between an analytical and numerical solution to the acoustic field in a duct. The
accuracy and robustness of the wave expansion method is assessed for this benchmark problem
before its versatility is demonstrated with examples.
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