Title

A computational study of asymmetric glottal jet deflection during phonation

Document Type

Journal Article

Publication Date

4-1-2011

Journal

Journal of the Acoustical Society of America

Volume

129

Issue

4

DOI

10.1121/1.3544490

Abstract

Two-dimensional numerical simulations are used to explore the mechanism for asymmetric deflection of the glottal jet during phonation. The model employs the full Navier-Stokes equations for the flow but a simple laryngeal geometry and vocal-fold motion. The study focuses on the effect of Reynolds number and glottal opening angle with a particular emphasis on examining the importance of the so-called Coanda effect in jet deflection. The study indicates that the glottal opening angle has no substantial effect on glottal jet deflection. Deflection in the glottal jet is always preceded by large-scale asymmetry in the downstream portion of the glottal jet. A detailed analysis of the velocity and vorticity fields shows that these downstream asymmetric vortex structures induce a flow at the glottal exit which is the primary driver for glottal jet deflection. © 2011 Acoustical Society of America.

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