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Propagation of Acoustical Waves in an Axisymmetrical Duct With Swirling Mean Flow
Author(s) -
Boltalova N.,
Schemel C.,
Thiele F.,
Michel U.
Publication year - 2003
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200310482
Subject(s) - rotational symmetry , mean flow , duct (anatomy) , mechanics , azimuth , fourier series , physics , acoustics , mathematics , optics , mathematical analysis , turbulence , medicine , pathology
A 3D axisymmetric Computational Aero Acoustic (CAA) procedure is extended to predict the propagation and radiation of the unsteady disturbances from a duct with swirling mean flow into the far field. Based on axisymmetric mean flow and acoustical boundary conditions, the 3D task is decomposed into a series of 2D problems using Fourier series expansions in the azimuthal direction. The numerical procedure is validated by the analytical solution within a solid body rotational, subsonic mean flow in a straight circular duct and the numerical results show a very good agreement.