Acoustic Relaxation Term for Damping and Forcing of Waves

An acoustic relaxation term for the momentum equation is introduced that can act as a damping or forcing term for pressure waves while leaving other modes untouched. This acoustic relaxation term can be seen as the acoustic variant of the eddy relaxation term previously introduced in other work, and therefore shares several important characteristics. Its damping behavior is shown to be favorably frequency selective; that is, application to a...