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Compressible flow simulations of voiced speech using rigid vocal tract geometries acquired by MRI
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics. KTH, School of Engineering Sciences (SCI), Mechanics, Biomechanics. (Linné FLOW Centre)
Aalto University.
KTH, School of Engineering Sciences (SCI), Mechanics. (Competence Center for Gas Exchange (CCGEx), FLOW)ORCID iD: 0000-0001-7330-6965
2019 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 145, no 4, p. 2049-2061, article id 0001-4966/2019/145(4)/2049/13Article in journal (Refereed) Published
Abstract [en]

Voiced speech consists mainly of the source signal that is frequency weighted by the acoustic filtering of the upper airways and vortex-induced sound through perturbation in the flow field. This study investigates the flow instabilities leading to vortex shedding and the importance of coherent structures in the supraglottal region downstream of the vocal folds for the far-field sound signal. Large eddy simulations of the compressible airflow through the glottal constriction are performed in realistic geometries obtained from three-dimensional magnetic resonance imaging data. Intermittent flow separation through the glottis is shown to introduce unsteady surface pressure through impingement of vortices. Additionally, dominant flow instabilities develop in the shear layer associated with the glottal jet. The aerodynamic perturbations in the near field and the acoustic signal in the far field are examined by means of spatial and temporal Fourier analysis. Furthermore, the acoustic sources due to the unsteady supraglottal flow are identified with the aid of surface spectra, and critical regions of amplification of the dominant frequencies of the investigated vowel geometries are identified.

Place, publisher, year, edition, pages
2019. Vol. 145, no 4, p. 2049-2061, article id 0001-4966/2019/145(4)/2049/13
Keywords [en]
Compressible flow simulations, voiced speech, LES, vocal tract geometries, MRI
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-249936DOI: 10.1121/1.5095250ISI: 000466779100018Scopus ID: 2-s2.0-85065566595OAI: oai:DiVA.org:kth-249936DiVA, id: diva2:1306316
Projects
VR 621-2012-4256
Funder
Swedish Research Council, VR 621-2012-4256
Note

QC 20190424

Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-05-29Bibliographically approved

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fulltext(6946 kB)45 downloads
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18141646e9704a1565352f73f37076f5db463192c47da82b3934f6fdbb2c545d4ec2877f734ea4c751437fe09d24f1c2cc5ecbe67d4774201875c3b6518d1e8c
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Publisher's full textScopushttps://asa.scitation.org/doi/10.1121/1.5095250

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Schickhofer, Lukas

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