Computational Models of Laryngeal Aerodynamics: Potentials and Numerical Costs

Sadeghi, Hossein; Kniesburges, Stefan; Schützenberger, Anne; Döllinger, Michael

doi:10.1016/j.jvoice.2018.01.001

Cited by 26 publications

(51 citation statements)

References 91 publications

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“…Finally, the translational motion was varied along the longitudinal axis of the vocal folds with a sinusoidal function to create the elliptical shape of the glottis constriction as shown in Figure 2c. More details of the modeled motion of the vocal folds can be found in Sadeghi et al [50].…”

Section: Geometry Of Computational Model and Vocal Fold Motionmentioning

confidence: 99%

Section: Mesh Generation and Mesh Motionmentioning

confidence: 99%

“…The starting mesh was the fine mesh proposed by Sadeghi et al [50], which was subjected to a mesh independence study. Since the subglottal pressure in Sadeghi et al [50] was lower than the current study, the mesh independence study was reprocessed and extended. The maximum axial velocity at the glottis and 10 mm downstream of the glottal duct exit, the mean static pressure along the center axis and the flow rate were deviated by only 0.4%, 0.01%, 1.2% and 0.07%, respectively, from the finest mesh in the mesh independence study containing approximately 40 million cells.…”

Section: Mesh Generation and Mesh Motionmentioning

confidence: 99%

“…The corresponding time step size was 1 × 10 −6 s. This led to a mean CFL number of 5 which is appropriate for implicit solvers [63,64]. More details of the mesh motion strategies and the mesh independence study can be found in Sadeghi et al [50].…”

Section: Mesh Generation and Mesh Motionmentioning

confidence: 99%

“…In a previous study [50], we showed that pure flow simulation in the numerical larynx model is able to capture all the characteristic features of laryngeal aerodynamics if realistic oscillation patterns of vocal folds are applied as the moving boundaries on the model. Furthermore, such models with forced motion of vocal fold oscillation have been reported in the literature as powerful tools for the analysis of sound generation within the larynx [29][30][31]51] with the advantage of saving the computational time consumed by a fully coupled flow-structure interaction.…”

Section: Introductionmentioning

confidence: 99%

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Towards a Clinically Applicable Computational Larynx Model

et al. 2019

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The enormous computational power and time required for simulating the complex phonation process preclude the effective clinical use of computational larynx models. The aim of this study was to evaluate the potential of a numerical larynx model, considering the computational time and resources required. Using Large Eddy Simulations (LES) in a 3D numerical larynx model with prescribed motion of vocal folds, the complicated fluid-structure interaction problem in phonation was reduced to a pure flow simulation with moving boundaries. The simulated laryngeal flow field is in good agreement with the experimental results obtained from authors’ synthetic larynx model. By systematically decreasing the spatial and temporal resolutions of the numerical model and optimizing the computational resources of the simulations, the elapsed simulation time was reduced by 90% to less than 70 h for 10 oscillation cycles of the vocal folds. The proposed computational larynx model with reduced mesh resolution is still able to capture the essential laryngeal flow characteristics and produce results with sufficiently good accuracy in a significant shorter time-to-solution. The reduction in computational time achieved is a promising step towards the clinical application of these computational larynx models in the near future.

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Section: Geometry Of Computational Model and Vocal Fold Motionmentioning

confidence: 99%

Section: Mesh Generation and Mesh Motionmentioning

confidence: 99%

Section: Mesh Generation and Mesh Motionmentioning

confidence: 99%

Section: Mesh Generation and Mesh Motionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Towards a Clinically Applicable Computational Larynx Model

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Computational Fluid Dynamics Analysis of Surgical Approaches to Bilateral Vocal Fold Immobility

et al. 2019

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Objectives Bilateral vocal fold immobility (BVFI) is a rare and life‐threatening condition in which both vocal folds are fixed, resulting in airway obstruction associated with life‐threatening respiratory compromise. Treatment of BVFI is largely surgical and remains an unsatisfactory compromise between voice, breathing, and swallowing. No comparisons between currently employed techniques currently exist. We sought to employ computational fluid dynamics (CFD) modeling to delineate the optimal surgical approach for BVFI. Methods Utilizing clinical computed tomography of BVFI subjects, coupled with image analytics employing CFD models and subject pulmonary function data, we compared the airflow features in the baseline pathologic states and changes seen between endoscopic cordotomy, endoscopic suture lateralization, and posterior cricoid expansion. Results CFD modeling demonstrated that the greatest airflow velocity occurs through the posterior glottis on inspiration and anterior glottis on expiration in both the normal condition and in BVFI. Glottic airflow velocity and resistance were significantly higher in the BVFI condition compared to normal. Geometric indices (cross‐sectional area of airway) were lower in posterior cricoid expansion surgery when compared to alternate surgical approaches. CFD measures (airflow velocity and resistance) improved with all surgical approaches but were superior with posterior cricoid expansion. Conclusion CFD modeling can provide discrete, quantitative assessment of the airflow through the laryngeal inlet, and offers insights into the pathophysiology and changes that occur after surgery for BVFI. Level of Evidence NA. Laryngoscope, 130:E57–E64, 2020

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Numerical Simulation of Fluid-Structure-Acoustic Interactions Models of Human Phonation Process

Sváček

Valášek

2023

Advances in Mathematical Fluid Mechanics

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Computational Models of Laryngeal Aerodynamics: Potentials and Numerical Costs

Cited by 26 publications

References 91 publications

Towards a Clinically Applicable Computational Larynx Model

Towards a Clinically Applicable Computational Larynx Model

Computational Fluid Dynamics Analysis of Surgical Approaches to Bilateral Vocal Fold Immobility

Numerical Simulation of Fluid-Structure-Acoustic Interactions Models of Human Phonation Process

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