Computation of phonation aeroacoustics by an INS/PCE splitting method

Youngmin Bae, Young June Moon

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In this study, an INS/PCE splitting method is exploited to compute vocal sound generated within the glottis by a pulsating air jet at maximum speed less than Mach number of 0.1. The acoustic field is computed by solving the perturbed compressible equations (PCE), with acoustic sources acquired from the transient hydrodynamic solutions obtained by the incompressible Navier-Stokes equations (INS). The governing equations are spatially discretized with a sixth-order compact scheme and time-integrated by a four-stage Runge-Kutta method. The computed results show that a voice quality is closely related to the vortical structure in the shear layer of the pulsating jet and the jet characteristics are determined by its local Reynolds number, pulsating frequency (or fundamental frequency), and glottis closure. It is also found that the rotational motion of the glottis controls the glottal impedance by changing the flow separation points between the leading- and trailing-edge of the vocal folds and this increases the mechanical efficiency of the glottis as a sound generator in the phonation process.

Original languageEnglish
Pages (from-to)1332-1343
Number of pages12
JournalComputers and Fluids
Volume37
Issue number10
DOIs
Publication statusPublished - 2008 Dec 1

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Aeroacoustics
Navier Stokes equations
Acoustic generators
Runge Kutta methods
Flow separation
Acoustic fields
Mach number
Reynolds number
Hydrodynamics
Acoustics
Acoustic waves
Air

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanical Engineering

Cite this

Computation of phonation aeroacoustics by an INS/PCE splitting method. / Bae, Youngmin; Moon, Young June.

In: Computers and Fluids, Vol. 37, No. 10, 01.12.2008, p. 1332-1343.

Research output: Contribution to journalArticle

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