Summary
The effect of the intraglottal vortices on the glottal flow waveform was explored
using flow-structure-interaction (FSI) modeling. These vortices form near the superior
aspect of the vocal folds during the closing phase of the folds’ vibration. The geometry
of the vocal fold was based on the well-known M5 model. The model did not include
a vocal tract to remove its inertance effect on the glottal flow. Material properties
for the cover and body layers of the folds were set using curve fit to experimental
data of tissue elasticity. A commercially available FSI solver was used to perform
simulations at low and high values of subglottal input pressure. Validation of the
FSI results showed a good agreement for the glottal flow and the vocal fold displacement
data with measurements taken in the excised canine larynx model. The simulations result
further support the hypothesis that intraglottal vortices can affect the glottal flow
waveform, specifically its maximum flow declination rate (MFDR). It showed that MFDR
occurs at the same phase when the highest intraglottal vortical strength and the negative
pressure occur. It also showed that when MFDR occurs, the magnitude of the aerodynamic
force acting on the glottal wall is greater than the elastic recoil force predicted
in the tissue. These findings are significant because nearly all theoretical and computational
models that study the vocal fold vibrations mechanism do not consider the intraglottal
negative pressure caused by the vortices as an additional closing force acting on
the folds.
Key words
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Article info
Publication history
Published online: September 27, 2022
Accepted:
August 29,
2022
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2022 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
