Abstract
A hybrid aeroacoustic approach was developed for the efficient numerical computation of human phonation. In the first step, an incompressible flow simulation on a three-dimensional (3 D) computational grid, which is capable of resolving all relevant turbulent scales, is performed using STARCCM+ and finite volume method. In the second step, the acoustic source terms on the flow grid are computed and a conservative interpolation to the acoustic grid is performed. Finally, the perturbed convective wave equation is solved to obtain the acoustic field in 3 D with the finite element solver CFS++. Thereby, the conservative transformation of the acoustic sources from the flow grid to the acoustic grid is a key step to allow coarse acoustic grids without reducing accuracy. For this transformation, two different interpolation strategies are compared and grid convergence is assessed. Overall, 16 simulation setups are compared. The initial (267 000 degrees of freedom) and the optimized (21 265 degrees of freedom) simulation setup were validated by measurements of a synthetic larynx model. To conclude, the total computational time of the acoustic simulation is reduced by 95% compared to the initial simulation setup without a significant reduction of accuracy, being 7%, in the frequency range of interest.
Highlights
The detailed human phonation process and its influencing factors have still not been completely investigated
The demand for computational efficiency and fast computation is taken into account by the hybrid aeroacoustic approach in combination with the perturbed convective wave equation (PCWE)
Instead of the APE-2 formulation, the PCWE describes the acoustic field by the acoustic velocity potential, a scalar quantity
Summary
Seo and Moon (2005) derived a set of perturbation equations (PCE) based on a viscous/acoustic splitting Their model was applied to compute sound propagation of the human phonation process including coupling effects in the acoustic near-field (Bae and Moon, 2008; Jo et al, 2016). Acoustic perturbation equations (Ewert and Schr€oder, 2003) (APEs) have been used to accurately calculate the aerodynamic sound of the phonation process (H€uppe and Kaltenbacher, 2012; Sidlof et al, 2015; Z€orner et al, 2016). The numerical effort of the APE-2 variant has been reduced by the reformulation into the perturbed convective wave equation (PCWE) (Kaltenbacher et al, 2017) This efficient wave propagation model in conjunction with an incompressible flow simulation was applied to human phonation with good agreement (Valasek et al, 2019). We conclude the recent advances and provide an outlook
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
