期刊
APPLIED SCIENCES-BASEL
卷 11, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/app11041970
关键词
human phonation; vocal folds; turbulent flow; aeroacoustics; LES; WALE SGS; PCWE
类别
资金
- Czech Science Foundation [19-04477S]
- Student Grant Scheme at the Technical University of Liberec [SGS-2020-3068]
- project e-Infrastruktura CZ within the program Projects of Large Research, Development and Innovations Infrastructures [e-INFRA LM2018140]
In an aeroacoustic simulation of human voice production, the SGS model was found to significantly impact the acoustic spectrum, affecting both the flow field and sound spectrum downstream. The use of the WALE model resulted in more accurate predictions of peak volumetric flow rates and higher sound pressure levels for higher harmonic frequencies compared to the One-Equation model.
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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