Impact of the Sub-Grid Scale Turbulence Model in Aeroacoustic Simulation of Human Voice

Martin Lasota*, Petr Šidlof*, Manfred Kaltenbacher, Stefan Schoder

*Corresponding author for this work

Research output: Contribution to journalArticle

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
Original languageEnglish
Article number1970
Pages (from-to)1-19
Number of pages19
JournalApplied Sciences
Volume11
Issue number4
DOIs
Publication statusPublished - 2 Feb 2021

Keywords

  • Aeroacoustics
  • Human phonation
  • LES
  • PCWE
  • Turbulent flow
  • Vocal folds
  • WALE SGS

ASJC Scopus subject areas

  • Engineering(all)
  • Instrumentation
  • Materials Science(all)
  • Fluid Flow and Transfer Processes
  • Process Chemistry and Technology
  • Computer Science Applications

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