In this example Elmer-software is used to determine the scattering, reflection and abrorption of sound. The computations are based on the Helmholtz equation (i.e. the Fourier transform of the standard wave equation) and appropriate radiation boundary conditions for the acoustic sound pressure.

The pressure waves may be produced by a vibrating object, e.g. a loudspeaker inside the computational domain. The purpose of the numerical computations is then to estimate the pressure and intensity levels around and far from the object. The sound may also be produced by an external source. In this case one usually wants to estimate the scattering and reflection of an incoming plane wave, e.g., the response of an object on the sea bottom to echo sounding from the surface.

Here you can download an animation of the results mpeg: [~500kB]

Here you can download another animation of the results mpeg: [~500kB]

Yet another animation of the results mpeg: [~500kB]

Again, an animation of the results mpeg: [~500kB]