MAPPED INFINITE WAVE ENVELOPE ELEMENTS FOR ACOUSTIC RADIATION IN A UNIFORMLY MOVING MEDIUM
✍ Scribed by WALTER EVERSMAN
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 309 KB
- Volume
- 224
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
Variable order mapped in"nite wave envelope elements are developed for "nite-element modelling (FEM) of acoustic radiation in a uniformly moving medium. These elements can be used as a non-re#ecting boundary condition for computations on an in"nite domain in which a radiating body is immersed in a moving medium which is essentially undisturbed outside of the near "eld. An additional result of this study shows that the mapped wave envelope elements provide a boundary condition equivalent to sti!ness, mass, and damping matrices appended to the inner mesh. By choosing the transition between the standard FEM mesh and the mapped in"nite wave envelope as a surface of constant phase the mass matrix is caused to vanish identically. This has implications for transient FEM modelling of acoustic radiation. A demonstration of the characteristics of mapped in"nite wave envelope elements is given in the context of acoustic radiation from a turbofan inlet for which benchmark results are known.