High-resolution CFD simulation of flow in glottis using LES

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F19%3A00518415" target="_blank" >RIV/61388998:_____/19:00518415 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.aql2019.conference.mcgill.ca/" target="_blank" >http://www.aql2019.conference.mcgill.ca/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

High-resolution CFD simulation of flow in glottis using LES

Popis výsledku v původním jazyce

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. nn

Název v anglickém jazyce

High-resolution CFD simulation of flow in glottis using LES

Popis výsledku anglicky

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. nn

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10307 - Acoustics

Projekt

<a href="/cs/project/GA19-04477S" target="_blank" >GA19-04477S: Modelování a měření strukturálně-akustických interakcí s prouděním v biomechanice tvorby hlasu člověka</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů