High-resolution CFD simulation of flow in glottis using LES

0518415 - ÚT 2020 RIV CA eng A - Abstract
Šidlof, Petr - Lasota, M.
High-resolution CFD simulation of flow in glottis using LES.
The 13th International Conference on Advances in Quantitative Laryngology, Voice and Speech Research. Quebec: McGill University Montreal, 2019 - (Mongeau, L.; Li-Jessen, N.). s. 29-29
[International Conference on Advances in Quantitative Laryngology, Voice and Speech Research /13./. 02.06.2019-04.06.2019, McGill University, Montreal, Quebec]
R&D Projects: GA ČR(CZ) GA19-04477S
Institutional support: RVO:61388998
Keywords : voice modelling * numerical simulation * large eddy simulation
OECD category: Acoustics
http://www.aql2019.conference.mcgill.ca/

A high-resolution CFD simulation of airflow through the larynx in human phonation was performed using the Large Eddy Simulation approach. The model uses a simplified 3D geometry with forced symmetric oscillation of the vocal folds and static ventricular folds. The domain was meshed in such a way, that the boundary layer in the convergent glottal channel and intraglottal space is well captured, thus avoiding use of special wall-treatment models. Computational grids used in the simulation range from two to five million elements. The velocity fields, pressure distribution and flow waveforms are compared for different computational meshes. Particular attention is paid to regions, where the major aeroacoustic sources are located, as known from previous studies using a laminar flow model. The results show that the flowrate waveform simulated by LES significantly differs from the results of the laminar model due to SGS viscosity, which exceeds molecular viscosity by almost one order of magnitude in the intraglottal space, thus reducing the flow rate.


Permanent Link: http://hdl.handle.net/11104/0304298