A DRBEM model for sound waves propagation in an inhomogeneous medium

摘要

The Dual Reciprocity Blundary Element Method (DRBEM( is applied to sound wave propagation problems in non homogeneous medium either in a closed or an an infinite domain, for which it is particularly well fitted. The equation to be solved is a Poisson equation and the inhomoge-neities are treated as a source term, which is represented as a serie with unknown coefficient and known interpolation functions. Making use of the Green's third formula, the volume integrals can be converted into surface ones. Application to finite or infinite domains with tempaerature or velocity gradients shows the ability of the method.