Publication detail

Effects of Turbulence in FE Model of Human Vocal Folds Self-oscillation

HÁJEK, P. ŠVANCARA, P. HORÁČEK, J. ŠVEC, J.

Original Title

Effects of Turbulence in FE Model of Human Vocal Folds Self-oscillation

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

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

Book

Engineering Mechanics 2017

Pages from

366

Pages to

369

Pages count

4

URL

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",
  annote="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.",
  address="Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v. v. i., Prague",
  booktitle="Engineering Mechanics 2017",
  chapter="136512",
  howpublished="print",
  institution="Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v. v. i., Prague",
  number="1",
  year="2017",
  month="may",
  pages="366--369",
  publisher="Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v. v. i., Prague",
  type="conference paper"
}