Abstract
The basic sound radiation from circular and ellipt ical jets generated from large-scale structures is calculated using a hybrid method in which the hydrodynamics is computed using an incompressible Large-Eddy Simulation (LES) procedure and the generated sound field is calculated by introducing the Lighthill’s analogy. The flow in this investigation has a Reynolds number (Re) of 6000 based on the jet diameter. The circular and elliptic configurations have the same effective diameter . The Quick and FCT (Flux Corrected Transport) schemes are used to calculate the convection terms. Thus the simulation is of a Monotonically Integrated LES (MILES) when the FCT algorithm is used. The sub-grid scale (SGS) stress is also modelled explicitly using the Mixed Time Scale (MTS) model. When compared with the circular jet the elliptic jets show enhanced mixing and axis-switching as expected. The sound radiation is calculated and analysed using the quadrupoles time history and the directivity plots.
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