Hein, Stefan und Koch, Werner (2007) Acoustic resonances and trapped modes in pipes and tunnels. Journal of Fluid Mechanics, 605, Seiten 401-428. Cambridge University Press. ISSN 0022-1120.
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Offizielle URL: http://www.jfm.damtp.cam.ac.uk
Kurzfassung
Acoustic resonances of simple three-dimensional finite-length structures in an infinitely long cylindrical pipe are investigated numerically by solving an eigenvalue problem. To avoid unphysical reflections at the finite grid boundaries placed in the uniform cross-sections of the pipe perfectly matched layer absorbing boundary conditions are applied in the form of the complex scaling method of atomic and molecular physics. Examples of the structures investigated are sound-hard spheres, cylinders, cavities and closed side branches. Several truly trapped modes with zero radiation loss are identified for frequencies below the first cut-off frequency of the pipe. Such trapped modes can be excited aerodynamically by coherent vortices if the frequency of the shed vortices is close to a resonant frequency. Furthermore, numerical evidence is presented for the existence of isolated embedded trapped modes for annular cavities above the first cut-off frequency and for closed side branches below the first cut-off frequency. As applications of engineering interest the acoustic resonances are computed for a ball-type valve and around a simple model of a high-speed train in an infinitely long tunnel.
elib-URL des Eintrags: | https://elib.dlr.de/51396/ | ||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||
Titel: | Acoustic resonances and trapped modes in pipes and tunnels | ||||||||||||
Autoren: |
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Datum: | September 2007 | ||||||||||||
Erschienen in: | Journal of Fluid Mechanics | ||||||||||||
Referierte Publikation: | Ja | ||||||||||||
Open Access: | Nein | ||||||||||||
Gold Open Access: | Nein | ||||||||||||
In SCOPUS: | Nein | ||||||||||||
In ISI Web of Science: | Ja | ||||||||||||
Band: | 605 | ||||||||||||
Seitenbereich: | Seiten 401-428 | ||||||||||||
Verlag: | Cambridge University Press | ||||||||||||
ISSN: | 0022-1120 | ||||||||||||
Status: | veröffentlicht | ||||||||||||
Stichwörter: | acoustic resonances, trapped modes, perfectly matched layer (PML), pipe, sound-hard spheres and cylinders, cavity, side branches, ball-type valve, high-speed train | ||||||||||||
HGF - Forschungsbereich: | Verkehr und Weltraum (alt) | ||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||
HGF - Programmthema: | Starrflügler (alt) | ||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||
DLR - Forschungsgebiet: | L AR - Starrflüglerforschung | ||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Flugphysik (alt) | ||||||||||||
Standort: | Göttingen | ||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hubschrauber | ||||||||||||
Hinterlegt von: | Hein, Dr.-Ing. Stefan | ||||||||||||
Hinterlegt am: | 03 Jun 2008 | ||||||||||||
Letzte Änderung: | 15 Jan 2010 01:45 |
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