Aerodynamic transfer of energy to vibrating vocal folds for different driving mechanisms

0502494 - ÚT 2019 RIV CZ eng C - Conference Paper (international conference)
Valášek, J. - Sváček, P. - Horáček, Jaromír
Aerodynamic transfer of energy to vibrating vocal folds for different driving mechanisms.
Topical Problems of Fluid Mechanics 2018. Praha: Institue of Thermomechanics AS CR, 2018 - (Šimurda, D.; Bodnár, T.), s. 197-204. ISBN 978-80-87012-65-9. ISSN 2336-5781.
[Conference TOPICAL PROBLEMS OF FLUID MECHANICS 2018. Praha (CZ), 21.02.2018-23.02.2018]
Institutional support: RVO:61388998
Keywords : inlet boundary conditions * weakly imposed Dirichlet boundary condition * energy transfer function * finite element method
OECD category: Acoustics

This paper studies the mutual energy transfer between the fluid flow, described by incompressible Navier-Stokes equations, and the elastic body represented by vocal folds. The aerodynamic energy transfer function describes the amount and more importantly the sign of the energy exchange. It determines if the vocal fold vibrations are self-excited or prescribed.The energy transfer function is studied for three different driving mechanisms introduced by different inlet boundary conditions (BC). The most frequently used inlet BCs for incompressible model of fluid flow approximated by the finite element method are either Dirichlet BC giving the inlet velocity or do-nothing type of BC prescribing the pressure difference between the inlet and the outlet. Since the numerical simulations with both aforementioned BCs do not provide results observed experimentally the newly introduced BC based on the penalization approach seems as remedy. The numerical model consists of strongly coupled partitioned scheme based on the stabilized finite element method.


Permanent Link: http://hdl.handle.net/11104/0295177