A numerical simulation of laryngeal flow in a forced-oscillation glottal model

✍ Scribed by Fariborz Alipour; Chenwu Fan; Ronald C. Scherer

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 261 KB
• Volume: 10
• Category: Article
• ISSN: 0885-2308
• DOI: 10.1006/csla.1996.0005

✦ Synopsis

A numerical simulation of laryngeal flow was developed to study flow patterns and pressure and velocity waveforms in a model of the oscillating glottis. The unsteady Navier-Stokes equations were solved with a finite volume method using a nonuniform staggered grid. The numerical method was tested against published experimental data. In this study of glottal aerodynamics, the vocal folds independently and sinusoidally were moved from a converging to a diverging and back to a converging shape, and the input airflow sinusoidally varied from zero to a maximum and back to zero. The typical results were obtained for a Reynolds number of 2000 and for an oscillation frequency of 100 Hz. Results indicate that with this simulation of the entire flow field, periodic velocity and pressure fields exist throughout the laryngeal duct. The airflow separates within the glottis, creating intraglottal (and downstream) asymmetric flow throughout the glottal cycle, with formation of eddies downstream of the glottis. The observed maximum velocity delays due to the glottal wall movement would contribute to the well-known glottal volume velocity skewing during phonation.