WIT Press


Variational Formulation By Integral Equation For Acoustic Field Propagating In Cavities Including Viscous And Thermal Effects

Price

Free (open access)

Paper DOI

10.2495/BE960031

Volume

14

Pages

10

Published

1996

Size

703 kb

Author(s)

C. Karra, M. Ben Tahar, G. Marquette & M.T. Chau

Abstract

A new variational formulation using integral equations of sound acoustic propagation problems including viscous and thermal effects of the fluid is considered. This formulation is implemented numerically for the problems with revolution geometry by using the boundary element method. The numerical results are in good agreement with analytic ones in the case of a cylindrical cavity filled with air and submitted to a pressure excitation. It is shown that in the case of micro cavities, the viscous and thermal effects of air becomes important : the acoustic pressure is different to those obtained when the effects of viscosity and thermal conductiv

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