Computer Science – Sound
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rspta.284..287j&link_type=abstract
Royal Society (London), Philosophical Transactions, Series A, vol. 284, no. 1323, Feb. 18, 1977, p. 287-328.
Computer Science
Sound
7
Acoustic Propagation, Acoustic Scattering, Aerodynamic Noise, Shear Layers, Sound Transmission, Flow Stability, Jet Flow, Ray Tracing, Reflected Waves, Strouhal Number
Scientific paper
A fixed line source, oscillating harmonically in time, produces sound waves which fall on a two dimensional shear layer in which the velocity increases linearly over a finite distance and then remains constant. The linearized theory of sound allows a multiplicity of solutions. The ambiguity is resolved by an application of the principle of causality. As a result it is found that, for Strouhal numbers below a certain critical level, Helmholtz instability is evident but not if the Strouhal number is above critical. The instability wave fans out from a negligibly small region as the Strouhal number drops from critical until it occupies a wedge of 45 deg when the layer simplifies to a vortex sheet. The limit is the same as that derived by direct analysis of the vortex sheet but no ultra-distributions are necessary if the layer is not infinitesimally thin. Various other aspects of thin and thick layers are also discussed.
No associations
LandOfFree
The scattering of sound by a simple shear layer does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The scattering of sound by a simple shear layer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The scattering of sound by a simple shear layer will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-800750