Computer Science – Sound
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978rspsa.359...65c&link_type=abstract
Royal Society (London), Proceedings, Series A - Mathematical and Physical Sciences, vol. 359, no. 1696, Jan. 31, 1978, p. 65-91.
Computer Science
Sound
11
Acoustic Emission, Aeroacoustics, Gas Flow, Ionized Gases, Nonuniform Flow, Acoustic Propagation, Acoustic Scattering, Electromagnetic Fields, Hydrodynamics, Pulsed Radiation, Sound Generators, Wave Equations
Scientific paper
The generation, propagation, scattering, convection and radiation of sound by an ionized inhomogeneity in a nonuniform mean flow are studied in an extension of the hydrodynamic problem to include the case of a variable electromagnetic field. The acoustic source is modeled as two dipoles, associated with the Laplace-Lorentz (electromagnetic) force and the hydrodynamic force; an inhomogeneous wave equation which assumes a simple form at low Mach numbers describes the propagation and generation of sound in the flow. A problem involving biaxial symmetry is used to demonstrate the amplitude and shape of sound pulses for a number of hydrodynamic and electromagnetic conditions. Hydrodynamic sound generally prevails for aerodynamic and atmospheric conditions, while electromagnetic sound dominates in plasma and stellar situations.
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