Experimental validation of quasi-one-dimensional and two-dimensional steady glottal flow models

Cisonni, Julien; Hirtum, Annemie van; Luo, Xiaoyu; Pelorson, Xavier

doi:10.1007/s11517-010-0645-7

Cited by 8 publications

(10 citation statements)

References 23 publications

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“…formation z s along the diverging side of the constriction (z ≥ z c ) as the area corresponding to A s = c s • A c with separation constant c s ≥ 1 and minimum channel area A c . Concretely, the constant is set to c s = 1.13 given the constriction geometry which is within the range commonly reported in the literature [8][9][10]35 for glottal-like geometries (1.05 ≤ c s ≤ 1.4).…”

Section: A Pressure Drop With Single-phase Viscous Contributionmentioning

confidence: 99%

Pressure drop for adiabatic air-water flow through a time-varying constriction

2018

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The pressure drop for air-water flow within a vertical rigid channel containing a severe time-varying constriction is studied for different forcing frequencies f c ∈ {1, 6, 10} Hz after water (0 up to 5 ml) is injected upstream. The pressure drop at the minimum aperture is observed experimentally and can be modeled with a quasi-steady one-dimensional approach and viscous mixing during the closing and opening phase. It is found that the flow can be regarded as gas dominated during the closing phase. During the opening phase, mixing enhances as f c > 1 Hz, which emphasizes the contribution of water and water droplets to the viscous mixture. Eventually, for f c = 10 Hz and greater water volumes (≥3 ml), mixing is further increased so that the flow becomes homogeneous and turbulent during the opening phase. Assessed conditions are relevant to flow through the human glottis.

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Section: A Pressure Drop With Single-phase Viscous Contributionmentioning

confidence: 99%

Pressure drop for adiabatic air-water flow through a time-varying constriction

2018

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“…Validation of all fluid dynamics, structural mechanics and acoustics simultaneously was done by Ruty et al [79], showing a good qualitative agreement with low-order models. Cisonni [80] compared one-and two-dimensional models, especially regarding the pressure distribution and flow separation. The work of Scherer et al [81,82] provides measurement data for comparison.…”

Section: Model Verificationmentioning

confidence: 99%

Mathematical Models and Numerical Schemes for the Simulation of Human Phonation

Alipour¹,

Brücker²,

Cook³

et al. 2011

CBIO

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Acoustic data has long been harvested in fundamental voice investigations since it is easily obtained using a microphone. However, acoustic signals alone do not reveal much about the complex interplay between sound waves, structural surface waves, mechanical vibrations, and fluid flow involved in phonation. Available high speed imaging techniques have over the past ten years provided a wealth of information about the mechanical deformation of the superior surface of the larynx during phonation. Time-resolved images of the inner structure of the deformable soft tissues are not yet feasible because of low temporal resolution (MRI and ultrasound) and x-ray dose-related hazards (CT and standard xray). One possible approach to circumvent these challenges is to use mathematical models that reproduce observable behavior such as phonation frequency, closed quotient, onset pressure, jitter, shimmer, radiated sound pressure, and airflow. Mathematical models of phonation range in complexity from systems with relatively small degrees of freedom (multi-mass models) to models based on partial differential equations (PDEs) mostly solved by finite element (FE) methods resulting in millions of degrees-of-freedom. We will provide an overview about the current state of mathematical models for the human phonation process, since they have served as valuable tools for providing insight into the basic mechanisms of phonation and may eventually be of sufficient detail and accuracy to allow surgical planning, diagnostics, and rehabilitation evaluations on an individual basis. Furthermore, we will also critically discuss these models w.r.t. the used geometry, boundary conditions, material properties, their verification, and reproducibility.

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“…Such a problem commonly occurs in the stability analysis of complex systems, such as flows in a collapsible channel [Luo et al, 2008;Stewart et al, 2010b;Xu et al, 2013Xu et al, , 2014. Flows in collapsible tubes, or flows in collapsible channels when simplified in two dimensions, have grasped researchers' attention over the last 30 years [Shapiro, 1977;Elad et al, 1987;Kamm and Shapiro, 1979;Cancelli and Pedley, 1985;Jensen, 1990;Luo and Pedley, 1996;Stewart et al, 2010a], because it has provided insight for many physiological applications such as flow through vocal folds [Cisonni et al, 2010], collapsed intramyocardial coronary blood arteries during heart contraction in systole [Guiot et al, 1990], branchial arteries compressed by a sphygmomanometry cuff [Bertram and Ribreau, 1989], and flows in giraffe jugular veins [Brook and Pedley, 2002]. One characteristic of such systems is that they can be dynamically unstable due to fluid-structure interaction.…”

Section: Introductionmentioning

confidence: 99%

An Arnoldi-Frontal Approach for the Stability Analysis of Flows in a Collapsible Channel

Hao

Cai

Roper

et al. 2016

Int. J. Appl. Mechanics

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In this paper, we have developed a new approach based on a combination of the Arnoldi and frontal methods, which is suitable for solving large sparse asymmetric and generalized complex eigenvalue problems. The new eigensolver seeks the most unstable eigen-solution in the Krylov subspace and makes use of the efficiency of the frontal solver developed for the finite element methods. The approach is used for a stability analysis of flows in a collapsible channel and is found to significantly improve the computational efficiency compared to the traditionally used QZ solver or a standard Arnoldi method. With the new approach, we are able to validate the previous results obtained either on a much coarser mesh or estimated from unsteady simulations. New neutral stability solutions of the system are also obtained which are beyond the limit of previously used methods.

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Experimental validation of quasi-one-dimensional and two-dimensional steady glottal flow models

Cited by 8 publications

References 23 publications

Pressure drop for adiabatic air-water flow through a time-varying constriction

Pressure drop for adiabatic air-water flow through a time-varying constriction

Mathematical Models and Numerical Schemes for the Simulation of Human Phonation

An Arnoldi-Frontal Approach for the Stability Analysis of Flows in a Collapsible Channel

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