Development and Application of the Dual Reciprocity Boundary Element Method for Acoustic Propagation in Inhomogeneous Axisymmetric Domains
Résumé
In this paper, a numerical model using the dual reciprocity boundary element method (DRBEM) is developed to model
acoustic propagation in an inhomogeneous axisymmetric domain. A detailed formulation is given for the particular case
of acoustic radiation from a source embedded in a region of significant temperature variation. The model is first applied
to calculate the acoustic propagation within a duct in the presence of a temperature gradient along the duct central line.
Results obtained show good agreement with experimental results. The model is then applied to calculate the acoustic
radiation from an unftanged exhaust in the presence of temperature gradient in the vicinity of the outlet. Measured and
computed transmissions losses are shown to be in close agreement. Although the formulation is presented in the context
of acoustic propagation in presence of a temperature field, it applies equally well to other wave propagation problems
which involve the solution of inhomogeneous, Helmholtz type equations.