Numerical Simulation of Fluid-Structure- and Fluid-Structure-Acoustic Interaction Based on a Partitioned Coupling Scheme

Schäfer, Frank; Kniesburges, Stefan; Uffinger, Thomas; Becker, Stefan; Grabinger, Jens; Link, G.

doi:10.1007/978-3-540-69182-2_27

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…Post-processing fluid flow This hybrid workflow was frequently applied to compute the human voice production [6,9,10,[22][23][24][25][26][27][28][29][30]. A full fluid-solid-acoustic coupling was presented by [24], who used Lighthill's acoustic analogy to calculate the acoustics.…”

Section: Fluid Dynamics -Cfd -Measurementsmentioning

confidence: 99%

Aeroacoustic Sound Source Characterization of the Human Voice Production-Perturbed Convective Wave Equation

et al. 2021

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The flow-induced sound sources of human voice production are investigated based on a validated voice model. This analysis is performed using a hybrid aeroacoustic workflow based on the perturbed convective wave equation. In the first step, the validated 3D incompressible turbulent flow simulation is computed by the finite volume method using STARCCM+. In a second step, the aeroacoustic sources are evaluated and studied in detail. The formulation of the sound sources is compared to the simplification (neglecting the convective sources) systematically using time-domain and Fourier-space analysis. Additionally, the wave equation is solved with the finite element solver openCFS to obtain the 3D sound field in the acoustic far-field. During the detailed effect analysis, the far-field sound spectra are compared quantitatively, and the flow-induced sound sources are visualized within the larynx. In this contribution, it is shown that the convective part of the sources dominates locally near the vocal folds (VFs) while the local time derivative of the incompressible pressure is distributed in the whole supra-glottal area. Although the maximum amplitude of the time derivative is lower, the integral contribution dominates the sound spectrum. As a by-product of the detailed perturbed convective wave equation source study, we show that the convective source term can be neglected since it only reduces the validation error by 0.6%. Neglecting the convective part reduces the algorithmic complexity of the aeroacoustic source computation of the perturbed convective wave equation and the stored flow data. From the source visualization, we learned how the VF motion transforms into specific characteristics of the aeroacoustic sources. We found that if the VFs are fully closing, the aeroacoustic source terms yield the highest dynamical range. If the VFs are not fully closing, VFs motion does not provide as much source energy to the flow-induced sound sources as in the case of a healthy voice. As a consequence of not fully closing VFs, the cyclic pulsating velocity jet is not cut off entirely and therefore turbulent structures are permanently present inside the supraglottal region. These turbulent structures increase the broadband component of the voice signal, which supports research results of previous studies regarding glottis closure and insufficient voice production.

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Section: Fluid Dynamics -Cfd -Measurementsmentioning

confidence: 99%

Aeroacoustic Sound Source Characterization of the Human Voice Production-Perturbed Convective Wave Equation

et al. 2021

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“…93 Additionally, Lighthill's analogy has been utilized to realize fluid-structure-acoustic coupling for human phonation and industrial structures. 11,94 Starting from investigations on the role of isotropic turbulence inside Lighthill's source, 95 many statistical models have been developed to quantify broadband noise. Ribner 15 and Powell 16 based their theory on comparing a slightly compressible flow with an incompressible flow, where the vorticity ω plays a major role in the derivation of the acoustic propagation.…”

Section: Lighthill's Analogymentioning

confidence: 99%

Hybrid Aeroacoustic Computations: State of Art and New Achievements

Schoder

2019

J. Theor. Comp. Acout.

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This paper collects the state of the art and the tremendous progress that has been made in hybrid modeling of aeroacoustic sound. Hybrid modeling is defined such that flow and acoustics are modeled separate and connected by an aeroacoustic model. The contributions will be classified with respect to the aeroacoustic models being developed, covering Lighthill’s analogy, Ffowcs Williams and Hawkings, vortex sound, linearized Euler equations (LEE), and different perturbation equations modeling flow induced sound. Within each topic, specific applications, such as jet noise, aircraft noise, ground mobility, noise, fan noise and human phonation, are covered. We focus on the accomplishments and provide the authors’ contribution to aeroacoustic research. Eventually, a concise summary of the different methods and their capabilities is included.

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A numerical investigation on effects of structural flexibility on aerodynamic far field sound

2014

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Numerical Simulation of Fluid-Structure- and Fluid-Structure-Acoustic Interaction Based on a Partitioned Coupling Scheme

Cited by 6 publications

References 4 publications

Aeroacoustic Sound Source Characterization of the Human Voice Production-Perturbed Convective Wave Equation

Aeroacoustic Sound Source Characterization of the Human Voice Production-Perturbed Convective Wave Equation

Hybrid Aeroacoustic Computations: State of Art and New Achievements

A numerical investigation on effects of structural flexibility on aerodynamic far field sound

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