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A fully numerical procedure has been developed to determine the acoustic modes in ducts of arbitrary cross-section and mean flow profile.
Several model equations are used, one of them taking into account turbulent eddy viscosity, and a realistic turbulent mean flow profile is used that vanishes at the wall.
A study with several different artificial jet expansions concluded that the acoustic scattering is not significantly dependent on the mean flow profile below the area expansion.
The propagation constants and the corresponding modal matrix that determines the degree of the coupling are analyzed with reference to applications to some standard mean flow profile shapes and compared with previous results.
Similar(56)
To provide mean flow profiles at all axial locations, a numerical scheme is used to calculate the mean flow properties.
The resulting mean flow profiles and turbulence statistics were found to be in excellent agreement with the published data based on the Chebychev-spectral method.
Both two-dimensional (2D) rectangular and 2D cylindrical geometry and uniform mean flow as well as non-uniform mean flow profiles are considered.
The prediction of the end correction for the constructed mean flow profiles deviates significantly from that for the realistic profile in a Strouhal number regime representing strong coupling between acoustic and hydrodynamic waves.
The comparisons cover the mean-flow profile, the r.m.s.
A significant difference between these studies appertains to the form of the axial mean flow velocity profile assumed in the analysis.
Both the parallel and co-axial perforated multiple pipe elements are considered and the effect of mean flow velocity profile and slip velocity is shown by application to a straight-through resonator.
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