ABSTRACT
In the previous chapters many simulations in ANSYS were described where the acoustic domain was finite and bounded either by a rigid wall or there was a vibrating structure such as a plate. In Section 3.3.6 an example was shown of an anechoic termination on a duct that required a wave-absorbing condition. In this chapter, the application of wave-absorbing conditions is further illustrated by the creation of infinite or semi-infinite acoustic domains to investigate the radiation of sound from acoustic sources, an oscillating piston, and to investigate the scattering of an incident acoustic plane wave by an object. There are three recommended ways that a wave-absorbing boundary can be simulated using ANSYS for 3D analyses: Perfectly Matched Layers (PMLs), radiation boundary conditions, and infinite fluid elements. These wave-absorbing boundary conditions can only be used for certain types of analyses as listed in Table 8.1.
