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Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle

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Authors
Cisonni, Julien
Nozaki, K.
Van Hirtum, A.
Grandchamp, X.
Wada, S.
Date
2013
Type
Journal Article

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Cisonni, J. and Nozaki, K. and Van Hirtum, A. and Grandchamp, X. and Wada, S. 2013. Numerical simulation of the influence of the orifice aperture on the flow around a teeth-shaped obstacle. Fluid Dynamics Research. 45 (2): 025505.
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Fluid Dynamics Research
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Copyright © 2013 Japan Society of Fluid Dynamics (JSFM)

This is an author-created, un-copyedited version of an article accepted for publication in Fluid Dynamics Research. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://doi.org/10.1088/0169-5983/45/2/025505

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Abstract

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.