Silent boundary for time domain wave motion analyses based on direct energy deletion

✍ Scribed by M.O. Al-Hunaidi

• Book ID: 104322599
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 908 KB
• Volume: 9
• Category: Article
• ISSN: 0267-7261
• DOI: 10.1016/s0267-7261(05)80022-3

✦ Synopsis

A new specialized method to simulate the radiation condition of unbounded domains is developed. This method is of the so called 'local type' and it is designed for semi-discretized finite models analysed in the time domain, considering linear elastic behaviour of the exterior unbounded domain and arbitrary nonlinear behaviour of the interior. The principle of the proposed method is based on erasing the wave energy in an extended boundary region so that the front of reflected waves is continually held back from the interior of the finite model. This is achieved via a simple numerical scheme which maintains a wave field continuity that can be handled by the discretized system without creating numerical wave shocks. It has turned out that the accuracy of the method is a function of the size of the extended boundary region; the larger the boundary region, the better the accuracy.