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|Title:||On the prediction of self-noise due to supercavitating underwater vehicle moving at subsonic speed using boundary element approach|
M. Lim, K.
|Source:||Ramesh, S.S.,M. Lim, K.,Khoo, B.C. (2012). On the prediction of self-noise due to supercavitating underwater vehicle moving at subsonic speed using boundary element approach. Proceedings of Meetings on Acoustics 17 : -. ScholarBank@NUS Repository. https://doi.org/10.1121/1.4790328|
|Abstract:||Flow supercavitation begins when fluid is accelerated over a sharp edge, usually at the nose of an underwater vehicle, where a phase change occurs and causes a low density gaseous cavity to gradually envelop the whole object (supercavity) thereby allowing for higher speeds of underwater vehicles. The supercavity may be maintained through ventilated cavitation caused by injection of gases into the cavity which causes hydrodynamic noise due to fluctuating vapor-water interface. Research thus far have focused on the computation of acoustic pressure for stationary surfaces; or acoustic pressure radiated from moving surfaces mainly in the framework of time domain and 3D problems which require considerable computational resources as opposed to frequency domain and 2D based approaches. This paper presents the acoustic pressure distribution in a supercavitating vehicle moving at subsonic speed based on an axisymmetric boundary element formulation. In effect, this renders the sound sources (due to the impingement of ventilating gas jets on the supercavity wall) to be in motion and demands for a re-formulation of the conventional boundary integral to include the 'Mach' term. Further, the method incorporates Burton & Miller scheme to tackle spurious frequencies inherent in exterior problems. © 2013 Acoustical Society of America.|
|Source Title:||Proceedings of Meetings on Acoustics|
|Appears in Collections:||Staff Publications|
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