Aeroacoustic Characterization of T-Junctions Based on Large Eddy Simulation and System Identification

Impact of turbulence on the prediction of linear aeroacoustic interactions: Acoustic response of a turbulent shear layer

“…The configurations differ in the duct diameter d od exp ¼ 0:057 m. While Strouhal number and Mach number show similarity, the Reynolds number of the simulation is 60 percent smaller than in the experiment. Föller et al [40] argue that this discrepancy has little influence on the momentum thickness of the shear layer and that the data collapses well with Strouhal number.…”

“…The domain Ω is discretized using the same mesh configuration which is described in detail in Föller et al [40]. Overall, 5 million hexahedral cells are used to account for the influence of numerical resolution [43].…”

“…Even Reynolds-averaged Navier-Stokes turbulence closures can be used under some limitations [42]. However, as the different time steps of a compressible LES were already available at the beginning of the study (see [40]), these are simply time-averaged.…”

Aeroacoustics of rectangular T-junctions subject to combined grazing and bias flows – An experimental investigation

“…Recently, Karlsson and Åbom [13] presented an experimental study in which they treated a T-junction as an active three-port, and performed measurements over a wide frequency range for three different combinations of grazing and bias flows. The three-port formulation was also used by Föller et al [14] who used LES to calculate the threeport for a case without bias flow, which compared well to the experimental data of Karlsson and Åbom [13].…”

Parametric LES/SI Based Aeroacoustic Characterization of Tandem Orifices in Low Mach Number Flows

“…The assessment of the acoustic scattering at an element in an unsteady flowfi eld can be performed by means of the so-called LES/SI method developed by Polifkea nd co-workers, e.g. [8,9], which combines Large Eddy Simulation (LES)a nd System Identification (SI) techniques. Hereby,anLES excited with abroadband acoustic signal is performed.…”