A three-dimensional study of the glottal jet

Krebs, Florian; Silva, Fabrice; Sciamarella, Denisse; Artana, Guillermo

doi:10.1007/s00348-011-1247-3

Cited by 17 publications

(16 citation statements)

References 35 publications

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“…The computed average volume flow rate is well within the 80 – 750 ml/s range measured in experiments using excised larynges and physical replicas of VFs (Alipour and Scherer 1995; van den Berg et al 1957; Cranen and Boves 1985; Erath and Plesniak 2006, 2010; Triep et al 2005) and computed using numerical models (Scherer et al 2001; Thomson et al 2005; Triep and Brücker 2010). The three-dimensional development of the computed glottal jet was also observed in experiments (Krebs et al 2012; Triep and Brücker 2010). The frequency of vibration as computed falls within the range of realistic phonation frequency (George et al 2008; Morris and Brown Jr. 1996; Titze 2006; Zhang et al 2006).…”

Section: Discussionsupporting

confidence: 63%

“…A related challenge is in solving the glottal airflow. Several studies (Drechsel and Thomson 2008; Krebs et al 2012; Sidlof et al 2011; Triep and Brücker 2010) focusing on the flow across three-dimensional (3D) VFs (either forced or self-oscillating) show that the glottal flow has a rich structure in time and space. Oversimplification of the glottal flow physics (2D geometry, low order flow models) may not yield reliable results in determining VF stresses during self-oscillation (Dejonckere and Kob 2009; Horáček et al 2005, 2009; Luo et al 2008, 2009; Zheng et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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A computational study of systemic hydration in vocal fold collision

Bhattacharya

Siegmund

2013

Computer Methods in Biomechanics and Biomedical Engineering

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Mechanical stresses develop within vocal fold (VF) soft tissues, due to phonation-associated vibration and collision. These stresses in turn affect the hydration of VF tissue and thus influence voice health. In this paper, high-fidelty numerical computations are described taking into account fully three-dimensional geometry, realistic tissue and air properties, and high-amplitude vibration and collision. A segregated solver approach is employed, using sophisticated commercial solvers for both the VF tissue and glottal airflow domains. The tissue viscoelastic properties were derived from a biphasic formulation. Two cases were considered, whereby the tissue viscoelastic properties corresponded to two different volume fractions of the fluid phase of the VF tissue. For each case, hydrostatic stresses occurring as a result of vibration and collision were investigated. Assuming the VF tissue to be poroelastic, interstitial fluid movement within VF tissue was estimated from the hydrostatic stress gradient. Computed measures of overall VF dynamics (peak air-flow velocity, magnitude of VF deformation, frequency of vibration and contact pressure) were well within the range of experimentally observed values. The VF motion leading to mechanical stresses within the VFs and their effect on the interstitial fluid flux is detailed. It is found that average deformation and vibration of VFs tends to increase the state of hydration of the VF tissue whereas VF collision works to reduce hydration.

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Section: Discussionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

A computational study of systemic hydration in vocal fold collision

Bhattacharya

Siegmund

2013

Computer Methods in Biomechanics and Biomedical Engineering

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“…Recently, a 3D reconstruction of an axis switching jet was performed in the context of phonation-related studies, for the 3D velocity field of a high aspect ratio jet. 10 The rates of growth of the jet in the two symmetry planes of the nozzle were shown to obey self-similarity principles, which make them inter-dependent. 11 All these experimental and numerical studies agree on one point: if there are no vortex structures, then axis switching should not be possible.…”

mentioning

confidence: 99%

Axis-switching of a micro-jet

Cabaleiro

Aider

2014

Physics of Fluids

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In this study, it is shown that free microjets can undergo complex transitions similar to large-scale free jets despite relatively low Reynolds numbers. Using an original experimental method allowing for the 3D reconstruction of the instantaneous spatial organization of the microjet, the axis-switching of a micro-jet is observed for the first time. This is the first experimental evidence of such complex phenomena for free micro-jets. Combining these experimental results with Direct Numerical Simulations it is shown that the mechanism responsible for the axis-switching is the deformation of a micro-vortex ring due to induction by the corner vortices, as it occurs in large scale non-circular jets.

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“…However, it is generally difficult to identify and track a streamline in a laryngeal flow that remains in place on which a meaningful Bernoulli analysis can be performed. The airflow in the supraglottal region (downstream of the glottis) is widely observed to form an orifice-modulated jet, (17) whose jet deflection angle changes stochastically over oscillation cycles, both in experiments (17–21) and numerical simulations. (22–24) Therefore, to provide the possibility of tracing a streamline, symmetry is enforced on the centerline where only half of the larynx is modeled, which is also a common practice seen in numerical simulations.…”

Section: Derivations Of Generalized Bernoulli Equation In a Movingmentioning

confidence: 99%

Evaluation of aerodynamic characteristics of a coupled fluid-structure system using generalized Bernoulli's principle: An application to vocal folds vibration

Zhang¹,

Yang²

2016

j coupled syst multiscale dyn

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In this work we explore the aerodynamics flow characteristics of a coupled fluid-structure interaction system using a generalized Bernoulli equation derived directly from the Cauchy momentum equations. Unlike the conventional Bernoulli equation where incompressible, inviscid, and steady flow conditions are assumed, this generalized Bernoulli equation includes the contributions from compressibility, viscous, and unsteadiness, which could be essential in defining aerodynamic characteristics. The application of the derived Bernoulli’s principle is on a fully-coupled fluid-structure interaction simulation of the vocal folds vibration. The coupled system is simulated using the immersed finite element method where compressible Navier-Stokes equations are used to describe the air and an elastic pliable structure to describe the vocal fold. The vibration of the vocal fold works to open and close the glottal flow. The aerodynamics flow characteristics are evaluated using the derived Bernoulli’s principles for a vibration cycle in a carefully partitioned control volume based on the moving structure. The results agree very well to experimental observations, which validate the strategy and its use in other types of flow characteristics that involve coupled fluid-structure interactions.

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A three-dimensional study of the glottal jet

Abstract: This work builds upon the efforts to characterize the three-dimensional

Cited by 17 publications

References 35 publications

A computational study of systemic hydration in vocal fold collision

A computational study of systemic hydration in vocal fold collision

Axis-switching of a micro-jet

Evaluation of aerodynamic characteristics of a coupled fluid-structure system using generalized Bernoulli's principle: An application to vocal folds vibration

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