Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Large Eddy Simulation of Airflow in Human Vocal Folds
Šidlof P.
Abstract:
Human phonation is a complex physiological process involving ow-induced oscillations of the vocal folds and aeroacoustic sound generation. The ow fields encountered in phonation are highly unsteady, feature massive ow separation and recirculation in the supraglottal spaces and generation of coherent vortex structures from the shear layer of the jet. For the sake of computational aeroacoustic modeling of human voice generation, an accurate resolution of the airow through the vocal folds is essential. The Reynolds-averaged Navier-Stokes turbulence modeling is inappropriate, since it provides only the averaged ow field. The paper presents the first results obtained with a large-eddy simulation of ow through a model of human vocal folds using a second-order finite volume discretization of incompressible Navier-Stokes equations. In the first step, the ow field was resolved on a fine 2D mesh covering a short subglottal region, the glottis and a part of the supraglottal channel. The simulation was parallelized using domain decomposition method and run in parallel on a shared-memory supercomputer. The results compare two large eddy simulations using the algebraic Smagorinsky and one-equation sub-grid scale models against a simulation without turbulence model.
Keywords:
human phonation, numerical simulation, large eddy simulations

Fulltext: PDF DOI: No Doi

In Proceedings Topical Problems of Fluid Mechanics 2015, Prague, 2015 Edited by David Šimurda and Tomáš Bodnár, pp. 183-192 ISBN 978-80-87012-55-0 (Print) ISSN 2336-5781 (Print)