On the use of different fundamental solutions for the interior acoustic problem

An alternative form of fundamental solution to the Helmholtz equation is presented, which proves to be very effective when employed in the integral formulation for interior acoustic problems. A BEM code was developed based on this solution and gave satisfactory results in dealing with structural-acoustic coupling in a cavity, either with or without absorption walls. Theoretical arguments supporting the use of the alternative fundamental solution are provided; then the discussion of some numerical results highlights the main differences between the present method and the one using the well known free-space Green's function as fundamental solution.