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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
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Pressure Distributions in Glottal Geometries With Multichannel Airflows.

Ingo R Titze1, Lynn Maxfield1, Brian Manternach1

  • 1Utah Center for Vocology, The University of Utah, Salt Lake City, Utah.

Journal of Voice : Official Journal of the Voice Foundation
|September 17, 2024
PubMed
Summary

Refined driving pressures are essential for accurate voice simulation, especially with complex vocal fold vibrations and partial contact. New methods reveal intricate pressure gradients beyond simplified models.

Keywords:
Glottis—Glottal pressures—Voice simulation—Physical models—Bernoulli

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Area of Science:

  • Acoustics
  • Bioengineering
  • Computational Fluid Dynamics

Background:

  • Accurate voice simulation relies on understanding vocal fold dynamics.
  • Previous models used simplified Bernoulli pressures, effective for basic oscillations.
  • Complex vocal fold vibrations, including partial contact, necessitate more sophisticated pressure modeling.

Purpose of the Study:

  • To refine driving pressure calculations for voice simulation.
  • To investigate pressure distributions during asymmetric vocal fold vibration with complex modes.
  • To compare computational and experimental methods for pressure mapping.

Main Methods:

  • Employed a high-fidelity immersed-boundary method for computation.
  • Utilized pressure tap measurements on scaled-up physical models.
  • Modeled glottal geometries based on normal surface modes of vibration.

Main Results:

  • Pressure distributions revealed complex, multi-directional gradients on vocal fold surfaces.
  • Qualitative agreement was found between computational and experimental data for various contact patterns.
  • Demonstrated significant variations in pressure gradients with multiple airflow channels.

Conclusions:

  • Simplified Bernoulli pressure models are adequate only when a single airflow channel is maintained.
  • Complex glottal geometries with multiple confluent or diffluent airflow channels require advanced pressure modeling.
  • Quantitative discrepancies between methods were attributed to spatial sampling limitations.