Publication detail
Effects of Turbulence in FE Model of Human Vocal Folds Self-oscillation
HÁJEK, P. ŠVANCARA, P. HORÁČEK, J. ŠVEC, J.
English title
Effects of Turbulence in FE Model of Human Vocal Folds Self-oscillation
Type
conference paper
Language
en
Original abstract
The purpose of the study is to determine whether a turbulence model in fluid flow calculation affects the vocal folds (VF) vibration and the acoustics of human vocal tract (VT). The objective is examined using a two-dimensional (2D) finite element (FE) model of the fluid-structure-acoustic interaction for self- sustained oscillations of the VF. The FE model consists of the models of the VF, the trachea and a simplified model of the human VT. The developed FE model includes large deformations of the VF tissue and VF contact interrupting the airflow during glottis closure. The airflow is modelled by the unsteady viscous compressible Navier-Stokes equations, without and with the Shear Stress Transport (SST) turbulence model. Fluid-structure interaction (FSI) and morphing of the fluid mesh are realized using Arbitrary Lagrangian- Eulerian (ALE) approach. The method is applied on the FE model of the VT shaped for the Czech vowel [a:]. Also effect of varying stiffness of the superficial lamina propria (SLP) is analyzed. The numerical simulations showed that considering of the turbulence affects mainly higher frequencies apparent in a frequency spectrum of the VT acoustics.
English abstract
The purpose of the study is to determine whether a turbulence model in fluid flow calculation affects the vocal folds (VF) vibration and the acoustics of human vocal tract (VT). The objective is examined using a two-dimensional (2D) finite element (FE) model of the fluid-structure-acoustic interaction for self- sustained oscillations of the VF. The FE model consists of the models of the VF, the trachea and a simplified model of the human VT. The developed FE model includes large deformations of the VF tissue and VF contact interrupting the airflow during glottis closure. The airflow is modelled by the unsteady viscous compressible Navier-Stokes equations, without and with the Shear Stress Transport (SST) turbulence model. Fluid-structure interaction (FSI) and morphing of the fluid mesh are realized using Arbitrary Lagrangian- Eulerian (ALE) approach. The method is applied on the FE model of the VT shaped for the Czech vowel [a:]. Also effect of varying stiffness of the superficial lamina propria (SLP) is analyzed. The numerical simulations showed that considering of the turbulence affects mainly higher frequencies apparent in a frequency spectrum of the VT acoustics.
Keywords in English
Simulation of phonation; SST turbulence model; Fluid-structure-acoustic interaction; Finite element method; Biomechanics of voice
Released
15.05.2017
Publisher
Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v. v. i., Prague
Location
Svratka
ISBN
978-80-214-5497-2
ISSN
1805-8248
Book
Engineering Mechanics 2017
Volume
23
Number
1
Pages from–to
366–369
Pages count
4
BIBTEX
@inproceedings{BUT136512,
author="Petr {Hájek} and Pavel {Švancara} and Jaromír {Horáček} and Jan G. {Švec},
title="Effects of Turbulence in FE Model of Human Vocal Folds Self-oscillation",
booktitle="Engineering Mechanics 2017",
year="2017",
volume="23",
number="1",
month="May",
pages="366--369",
publisher="Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v. v. i., Prague",
address="Svratka",
isbn="978-80-214-5497-2",
issn="1805-8248"
}