Anisotropic minimum dissipation subgrid-scale model in hybrid aeroacoustic simulations of human phonation

Author:

Lasota Martin1ORCID,Šidlof Petr2ORCID,Maurerlehner Paul3ORCID,Kaltenbacher Manfred3ORCID,Schoder Stefan3ORCID

Affiliation:

1. Institute of New Technologies and Applied Informatics, Technical University of Liberec 1 , Studentská 2, 460 01 Liberec, Czechia

2. Institute of Thermomechanics, Czech Academy of Sciences 2 , Dolejškova 5, 182 00 Prague, Czechia

3. Institute of Fundamentals and Theory in Electrical Engineering, Graz University of Technology 3 , Inffeldgasse 18, 8010 Graz, Austria

Abstract

This article deals with large-eddy simulations of three-dimensional incompressible laryngeal flow followed by acoustic simulations of human phonation of five cardinal English vowels, /ɑ, æ, i, o, u/. The flow and aeroacoustic simulations were performed in OpenFOAM and in-house code openCFS, respectively. Given the large variety of scales in the flow and acoustics, the simulation is separated into two steps: (1) computing the flow in the larynx using the finite volume method on a fine moving grid with 2.2 million elements, followed by (2) computing the sound sources separately and wave propagation to the radiation zone around the mouth using the finite element method on a coarse static grid with 33 000 elements. The numerical results showed that the anisotropic minimum dissipation model, which is not well known since it is not available in common CFD software, predicted stronger sound pressure levels at higher harmonics, and especially at first two formants, than the wall-adapting local eddy-viscosity model. The model on turbulent flow in the larynx was employed and a positive impact on the quality of simulated vowels was found.

Funder

Student Grant Scheme

Dr. Anton Oelzelt-Newin'sche Stiftung

Publisher

Acoustical Society of America (ASA)

Subject

Acoustics and Ultrasonics,Arts and Humanities (miscellaneous)

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