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Synthetic, Multi-Layer, Self-Oscillating Vocal Fold Model Fabrication
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Published on: December 2, 2011

Flow separation in a computational oscillating vocal fold model.

Fariborz Alipour1, Ronald C Scherer

  • 1Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa 52242, USA. alipour@blue.weeg.uiowa.edu

The Journal of the Acoustical Society of America
|October 14, 2004
PubMed
Summary
This summary is machine-generated.

This study used a computational model to investigate glottal flow separation. Findings reveal that airflow dynamics and vocal fold movement significantly influence where airflow separates within the glottis.

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Area of Science:

  • Fluid Dynamics
  • Bioacoustics
  • Computational Physiology

Background:

  • Understanding glottal airflow dynamics is crucial for voice production.
  • Flow separation within the glottis affects voice quality and pathologies.
  • Previous models have simplified the complex, time-dependent nature of glottal flow.

Purpose of the Study:

  • To computationally model and analyze glottal flow separation.
  • To investigate the influence of various parameters on flow separation location.
  • To understand the interaction between airflow, inertia, and vocal fold motion.

Main Methods:

  • Employed a finite-volume computational model for time-dependent glottal airflow.
  • Utilized a forced-oscillation model of the glottis.
  • Controlled tracheal input velocity with a sinusoidally varying parabolic profile.
  • Varied parameters: Reynolds number, oscillation frequency/amplitude, phase difference.

Main Results:

  • Velocity increases moved separation downstream; decreases moved it upstream.
  • Increased vocal fold amplitude moved separation downstream during closing.
  • Increased Reynolds number shifted separation upstream.
  • Flow separation ratio ranged from 1.1 to 1.9 (average 1.47) for divergent shapes.

Conclusions:

  • Strong interactions exist between airflow rate, inertia, and vocal fold wall movement.
  • Flow separation is delayed in the vibratory cycle, occurring later and persisting longer.
  • Separation point moves upstream only after significant divergence and persists into the convergent phase.