Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle
The sound generated during the production of the sibilant [s] results from the impact of a turbulent jet on the incisors. Several geometric characteristics of the oral tract can affect the properties of the flow-induced noise so that the characterization of the influence of different geometric param...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
IOP Publishing
2013
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/32345 |
| _version_ | 1848753636892475392 |
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| author | Cisonni, Julien Nozaki, K. Van Hirtum, A. Grandchamp, X. Wada, S. |
| author_facet | Cisonni, Julien Nozaki, K. Van Hirtum, A. Grandchamp, X. Wada, S. |
| author_sort | Cisonni, Julien |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The sound generated during the production of the sibilant [s] results from the impact of a turbulent jet on the incisors. Several geometric characteristics of the oral tract can affect the properties of the flow-induced noise so that the characterization of the influence of different geometric parameters on the acoustic sources properties allows determining control factors of the noise production. In this study, a simplified vocal tract/teeth geometric model is used to numerically investigate the flow around a teeth-shaped obstacle placed in a channel and to analyze the influence of the aperture at the teeth on the spectral properties of the fluctuating pressure force exerted on the surface of the obstacle, which is at the origin of the dipole sound source. The results obtained for Re = 4000 suggest that the aperture of the constriction formed by the teeth modifies the characteristics of the turbulent jet downstream of the teeth. Thus, the variations of the flow due to the modification of the constriction aperture lead to variations of the spectral properties of the sound source even if the levels predicted are lower than during the production of real sibilant fricative. |
| first_indexed | 2025-11-14T08:27:40Z |
| format | Journal Article |
| id | curtin-20.500.11937-32345 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:27:40Z |
| publishDate | 2013 |
| publisher | IOP Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-323452019-02-19T05:35:39Z Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle Cisonni, Julien Nozaki, K. Van Hirtum, A. Grandchamp, X. Wada, S. Fluid dynamics The sound generated during the production of the sibilant [s] results from the impact of a turbulent jet on the incisors. Several geometric characteristics of the oral tract can affect the properties of the flow-induced noise so that the characterization of the influence of different geometric parameters on the acoustic sources properties allows determining control factors of the noise production. In this study, a simplified vocal tract/teeth geometric model is used to numerically investigate the flow around a teeth-shaped obstacle placed in a channel and to analyze the influence of the aperture at the teeth on the spectral properties of the fluctuating pressure force exerted on the surface of the obstacle, which is at the origin of the dipole sound source. The results obtained for Re = 4000 suggest that the aperture of the constriction formed by the teeth modifies the characteristics of the turbulent jet downstream of the teeth. Thus, the variations of the flow due to the modification of the constriction aperture lead to variations of the spectral properties of the sound source even if the levels predicted are lower than during the production of real sibilant fricative. 2013 Journal Article http://hdl.handle.net/20.500.11937/32345 10.1088/0169-5983/45/2/025505 IOP Publishing fulltext |
| spellingShingle | Fluid dynamics Cisonni, Julien Nozaki, K. Van Hirtum, A. Grandchamp, X. Wada, S. Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle |
| title | Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle |
| title_full | Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle |
| title_fullStr | Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle |
| title_full_unstemmed | Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle |
| title_short | Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle |
| title_sort | numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle |
| topic | Fluid dynamics |
| url | http://hdl.handle.net/20.500.11937/32345 |