Abstract
When an acoustical object is tested in a duct, very often it is located downstream of a long rigid duct which creates a developed turbulent flow. This paper presents a strategy to reproduce the same situation numerically, in the subsonic case. The direct numerical simulation of a periodic precursor simulation is done, a plane of which is used to feed the spatial simulation where a developed flow is desired. The turbulence in the spatial channel is developed only if the correct source term is used in the precursor simulation, which has been discussed by Brun et al. (2008). The inflow/outflow section of the spatial channel are managed with the methods of characteristics including plane wave masking and relaxation terms. As a result plane acoustic waves are introduced with no distortion of the injected flow, and their propagation in the developed flow is computed and compared to predictions made by modal analysis. Some low frequencies are included, for which the damping rate is affected by turbulence.
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