A numerical model for the calculation of magneto-hydrodynamic fields induced from underwater acoustic sources

Author

Ramirez, J.A.

Author_Institution

Pontificia Univ. Catolica de Minas Gerais, Belo Horizonte, Brazil

Volume

34

Issue

5

fYear

1998

fDate

9/1/1998 12:00:00 AM

Firstpage

3090

Lastpage

3093

Abstract

This paper discusses a numerical model based on the finite element formulation for the calculation of magnetohydrodynamic fields induced from underwater acoustic sources in an ocean environment. The speed of sound is considered as depth dependent and the ocean as a conducting medium, i.e. eddy-currents are taken into account. An alternative formulation based on the modal method is also investigated. An axisymmetric problem consisting of a monopole source submerged in the ocean is considered. Acceptable results are obtained in both formulations for Bmag above the ocean surface

Keywords

acoustic field; acoustic radiators; eddy currents; finite element analysis; magnetohydrodynamics; underwater sound; axisymmetric problem; conducting medium; eddy-currents; finite element formulation; magnetohydrodynamic fields; modal method; monopole source; numerical model; ocean environment; speed of sound; underwater acoustic sources; Acoustic waves; Equations; Finite element methods; Magnetic field measurement; Magnetic fields; Magnetohydrodynamics; Numerical models; Oceans; Underwater acoustics; Water resources;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.717723

Filename

717723