On the Mechanics of Phonation and Fluid-Structure Interactions in a Three Dimensional Vocal Fold Model

Volume 10: Mechanics of Solids and Structures, Parts A and B ◽

10.1115/imece2007-42185 ◽

2007 ◽

Author(s):

Somesh Khandelwal ◽

Thomas Siegmund ◽

Steve H. Frankel

Keyword(s):

Vibration Amplitude ◽

Vocal Fold ◽

Flow Model ◽

Three Dimensional ◽

The Self ◽

Elastic Response ◽

Fluid Structure Interactions ◽

Fluid Structure ◽

Structure Interaction ◽

Laminar Flow Model

It is hypothesized that the characteristics of vocal fold self oscillation is dependent on the nonlinearity of the solid structure i.e. the tissue. Studies of fluid structure interaction are conducted for three dimensional larynx models. Simulations were performed using the codes FLUENT and ABAQUS coupled by the code MpCCI. For the air an unsteady, laminar flow model was considered. Visco-hyperelasticity was used to characterize the solid domain representing the tissue structure. The computational model is used to conduct a parametric study on the self-oscillation response of the model with focus on the influence of the non-linearity in the hyperelastic response. Individual computations were compared by documenting the variation of the total energy of the structure. It is demonstrated that dissipation in the flow as well as the non-linearity in the elastic response all interact to stabilize or destabilize the vibration amplitude.

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Numerical Investigation of Hydroelastic Response of a Three-Dimensional Deformable Hydrofoil

Progress in Marine Science and Technology - HSMV 2020 ◽

10.3233/pmst200029 ◽

2020 ◽

Author(s):

Saeed Hosseinzadeh ◽

Kristjan Tabri

Keyword(s):

Pressure Coefficient ◽

Fluid Structure Interaction ◽

Three Dimensional ◽

Leading Edge ◽

Elastic Response ◽

Fluid Structure ◽

Strongly Coupled ◽

Structure Interaction ◽

Lift And Drag ◽

Hydroelastic Response

The present study is concerned with the numerical simulation of Fluid-Structure Interaction (FSI) on a deformable three-dimensional hydrofoil in a turbulent flow. The aim of this work is to develop a strongly coupled two-way fluid-structure interaction methodology with a sufficiently high spatial accuracy to examine the effect of turbulent and cavitating flow on the hydroelastic response of a flexible hydrofoil. A 3-D cantilevered hydrofoil with two degrees-of-freedom is considered to simulate the plunging and pitching motion at the foil tip due to bending and twisting deformation. The defined problem is numerically investigated by coupled Finite Volume Method (FVM) and Finite Element Method (FEM) under a two-way coupling method. In order to find a better understanding of the dynamic FSI response and stability of flexible lifting bodies, the fluid flow is modeled in the different turbulence models and cavitation conditions. The flow-induced deformation and elastic response of both rigid and flexible hydrofoils at various angles of attack are studied. The effect of three-dimension body, pressure coefficient at different locations of the hydrofoil, leading-edge and trailing-edge deformation are presented and the results show that because of elastic deformation, the angle of attack increases and it lead to higher lift and drag coefficients. In addition, the deformations are generally limited by stall condition and because of unsteady vortex shedding, the post-stall condition should be considered in FSI simulation of deformable hydrofoil. To evaluate the accuracy of the numerical model, the present results are compared and validated against published experimental data and showed good agreement.

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Effects of Sulcus Vocalis Depth on Phonation in Three-Dimensional Fluid-Structure Interaction Laryngeal Models

Applied Bionics and Biomechanics ◽

10.1155/2021/6662625 ◽

2021 ◽

Vol 2021 ◽

pp. 1-11

Author(s):

Changwei Zhou ◽

Lili Zhang ◽

Yuanbo Wu ◽

Xiaojun Zhang ◽

Di Wu ◽

...

Keyword(s):

Vocal Fold ◽

Fluid Structure Interaction ◽

Three Dimensional ◽

Vocal Folds ◽

Threshold Pressure ◽

Fluid Structure ◽

Structure Interaction ◽

Phonation Threshold Pressure ◽

Different Types ◽

Sulcus Vocalis

Sulcus vocalis is an indentation parallel to the edge of vocal fold, which may extend into the cover and ligament layer of the vocal fold or deeper. The effects of sulcus vocalis depth d on phonation and the vocal cord vibrations are investigated in this study. The three-dimensional laryngeal models were established for healthy vocal folds (0 mm) and different types of sulcus vocalis with the typical depth of 1 mm, 2 mm, and 3 mm. These models with fluid-structure interaction (FSI) are computed numerically by sequential coupling method, which includes an immersed boundary method (IBM) for modelling the glottal airflow, a finite-element method (FEM) for modelling vocal fold tissue. The results show that a deeper sulcus vocalis in the cover layer decreases the vibrating frequency of vocal folds and expands the prephonatory glottal half-width which increases the phonation threshold pressure. The larger sulcus vocalis depth makes vocal folds difficult to vibrate and phonate. The effects of sulcus vocalis depth suggest that the feature such as phonation threshold pressure could assist in the detection of healthy vocal folds and different types of sulcus vocalis.

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Effect of Longitudinal Variation of Vocal Fold Inner Layer Thickness on Fluid-Structure Interaction During Voice Production

Journal of Biomechanical Engineering ◽

10.1115/1.4041045 ◽

2018 ◽

Vol 140 (12) ◽

Cited By ~ 4

Author(s):

Weili Jiang ◽

Qian Xue ◽

Xudong Zheng

Keyword(s):

Computational Model ◽

Layer Thickness ◽

Vibration Amplitude ◽

Vocal Fold ◽

Fluid Structure Interaction ◽

Thickness Variation ◽

Longitudinal Variation ◽

Fluid Structure ◽

Voice Production ◽

Structure Interaction

A three-dimensional fluid-structure interaction computational model was used to investigate the effect of the longitudinal variation of vocal fold inner layer thickness on voice production. The computational model coupled a finite element method based continuum vocal fold model and a Navier–Stokes equation based incompressible flow model. Four vocal fold models, one with constant layer thickness and the others with different degrees of layer thickness variation in the longitudinal direction, were studied. It was found that the varied thickness resulted in up to 24% stiffness reduction at the middle and up to 47% stiffness increase near the anterior and posterior ends of the vocal fold; however, the average stiffness was not affected. The fluid-structure interaction simulations on the four models showed that the thickness variation did not affect vibration amplitude, glottal flow rate, and the waveform related parameters. However, it increased glottal angles at the middle of the vocal fold, suggesting that vocal fold vibration amplitude was determined by the average stiffness of the vocal fold, while the glottal angle was determined by the local stiffness. The models with longitudinal variation of layer thickness consumed less energy during the vibrations compared with the constant layer thickness one.

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A Reduced-Order Flow Model for Fluid–Structure Interaction Simulation of Vocal Fold Vibration

Journal of Biomechanical Engineering ◽

10.1115/1.4044033 ◽

2019 ◽

Vol 142 (2) ◽

Cited By ~ 3

Author(s):

Zheng Li ◽

Ye Chen ◽

Siyuan Chang ◽

Haoxiang Luo

Keyword(s):

Vocal Fold ◽

Solid Mechanics ◽

Flow Model ◽

Fluid Structure Interaction ◽

Fluid Structure ◽

Reduced Order ◽

New Model ◽

Structure Interaction ◽

Vocal Fold Vibration ◽

Comparison Results

Abstract We present a novel reduced-order glottal airflow model that can be coupled with the three-dimensional (3D) solid mechanics model of the vocal fold tissue to simulate the fluid–structure interaction (FSI) during voice production. This type of hybrid FSI models have potential applications in the estimation of the tissue properties that are unknown due to patient variations and/or neuromuscular activities. In this work, the flow is simplified to a one-dimensional (1D) momentum equation-based model incorporating the entrance effect and energy loss in the glottis. The performance of the flow model is assessed using a simplified yet 3D vocal fold configuration. We use the immersed-boundary method-based 3D FSI simulation as a benchmark to evaluate the momentum-based model as well as the Bernoulli-based 1D flow models. The results show that the new model has significantly better performance than the Bernoulli models in terms of prediction about the vocal fold vibration frequency, amplitude, and phase delay. Furthermore, the comparison results are consistent for different medial thicknesses of the vocal fold, subglottal pressures, and tissue material behaviors, indicating that the new model has better robustness than previous reduced-order models.

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Modeling of aortic valve stenosis using fluid-structure interaction method

Perfusion ◽

10.1177/0267659121998549 ◽

2021 ◽

pp. 026765912199854

Author(s):

Mohammad Javad Ghasemi Pour ◽

Kamran Hassani ◽

Morteza Khayat ◽

Shahram Etemadi Haghighi

Keyword(s):

Blood Flow ◽

Aortic Valve ◽

Fluid Structure Interaction ◽

Three Dimensional ◽

Fluid Structure ◽

Structure Interaction ◽

Relaxation Phase ◽

Exercise Condition ◽

Time Dependent Domain ◽

Comparison Of The Results

Background and objectives: Fluid structure interaction (FSI) is defined as interaction of the structures with contacting fluids. The aortic valve experiences the interaction with blood flow in systolic phase. In this study, we have tried to predict the hemodynamics of blood flow through a normal and stenotic aortic valve in two relaxation and exercise conditions using a three-dimensional FSI method. Methods: The aorta valve was modeled as a three-dimensional geometry including a normal model and two others with 25% and 50% stenosis. The geometry of the aortic valve was extracted from CT images and the models were generated by MMIMCS software and then they were implemented in ANSYS software. The pulsatile flow rate was used for all cases and the numerical simulations were conducted based on a time-dependent domain. Results: The obtained results including the velocity, pressure, and shear stress contours in different systolic time sequences were explained and discussed. The maximum blood flow velocity in relaxation phase was obtained 1.62 m/s (normal valve), 3.78 m/s (25% stenosed valve), and 4.73 m/s (50% stenosed valve). In exercise condition, the maximum velocities are 2.86, 4.32, and 5.42 m/s respectively. The maximum blood pressure in relaxation phase was calculated 111.45 mmHg (normal), 148.66 mmHg (25% stenosed), and 164.21 mmHg (50% stenosed). However, the calculated values in exercise situation were 129.57, 163.58, and 191.26 mmHg. The validation of the predicted results was also conducted using existing literature. Conclusions: We believe that such model are useful tools for biomechanical experts. The further studies should be done using experimental data and the data are implemented on the boundary conditions for better comparison of the results.

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