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Aeroacoustics

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Direct simulation of a compressible turbulent jet by the UK Turbulence Consortium

 

 

These simulation results (of dilatation rate in the outer, and vorticity in the inner region) show that most sound emanates from a small region of the jet, near the end of the potential core. This finding has now been explained as being due to a transition in the phase speed of vortical structures as the potential core develops into a jet.

 

Aeroacoustics of a perturbed parallel jet flow,
N D Sandham, C L Morfey and Z W Hu,
2004, submitted to J. Fluid Mech

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