Abstract
This paper deals with the unstable behaviour of an acoustic boundary element model. The model, based on a marching on time (MOT) algorithm, uses a hypersingular derivative Green method. It is able to cope with open or closed diffracting objects. These objects are rigid or can be deformed. When a long enough computation is carried out, the pressure magnitude shows an exponential growth, which is an unrealistic behaviour. In the paper we show that we are faced with a numerical instability of the static pressure in closed cavities. A simple processing method using the eigenelement decomposition of an ‘ad hoc’ matrix suffices to correct the problem without damage to other components of the result. The method is related to a more general method dedicated to instability problems.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
