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Model ID: 1844

Jet Pipe

This example models the radiation of fan noise from the annular duct of a turbofan aeroengine. When the jet stream exits the duct, a vortex sheet appears along the extension of the duct wall due to the surrounding air moving at a lower speed. The near field on both sides of the vortex sheet is calculated.

The Aeroacoustics modeling interface in the Acoustics Module describes acoustic waves in a moving fluid. However, the field equation is only valid when the velocity field is irrotational, a condition that is not satisfied across a vortex sheet. As a consequence, the velocity potential is discontinuous across this sheet and to model this discontinuity, you use assemblies that are connected through coupling pairs.

The pressure distribution, relative to the inlet, in the jet pipe and surrounding environment. The streamlines show the intensity.

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