Impact of the Sub-Grid Scale Turbulence Model in Aeroacoustic Simulation of Human Voice
Source abstract
Abstract
In an aeroacoustic simulation of human voice production, the effect of the sub-grid scale (SGS) model on the acoustic spectrum was investigated. In the first step, incompressible airflow in a 3D model of larynx with vocal folds undergoing prescribed two-degree-of-freedom oscillation was simulated by laminar and Large-Eddy Simulations (LES), using the One-Equation and Wall-Adaptive Local-Eddy (WALE) SGS models. Second, the aeroacoustic sources and the sound propagation in a domain composed of the larynx and vocal tract were computed by the Perturbed Convective Wave Equation (PCWE) for vowels [u:] and [i:]. The results show that the SGS model has a significant impact not only on the flow field, but also on the spectrum of the sound sampled 1 cm downstream of the lips. With the WALE model, which is known to handle the near-wall and high-shear regions more precisely, the simulations predict significantly higher peak volumetric flow rates of air than those of the One-Equation model, only slightly lower than the laminar simulation. The usage of the WALE SGS model also results in higher sound pressure levels of the higher harmonic frequencies.
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Research context
OpenAlex topics: Aerodynamics and Acoustics in Jet Flows · Acoustic Wave Phenomena Research · Fluid Dynamics and Vibration Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of New Technologies and Applied Informatics, Technical University of Liberec, Studentská 2, 46117 Liberec, Czech Republic
Department of Technical Mathematics, Czech Technical University in Prague, Karlovo Náměstí 13, 12000 Prague, Czech Republic
Institute of Thermodynamics, Academy of Sciences of the Czech Republic, Dolejskova 5, 18200 Prague, Czech Republic
Institute for Mechanics and Mechatronics, Vienna University of Technology, Getreidemarkt 9, 1060 Wien, Austria
Institute of Fundamentals and Theory in Electrical Engineering, Graz University of Technology, Inffeldgasse 18, 8010 Graz, Austria
Funding
Grantová Agentura České Republiky · Student Grant Scheme at the Technical University of Liberec
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