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Farhoodi, Saeed, Heidarinejad, Ghassem, Roozbahani, Mohammad Hossein. (1401). Evaluation of Airflow Sensitivity to the Truncation Level of a Realistic Human Airway Model in an Accurate Numerical Simulation. سامانه مدیریت نشریات علمی, 12(4), 403-416. doi: 10.31661/jbpe.v0i0.2201-1452
Saeed Farhoodi; Ghassem Heidarinejad; Mohammad Hossein Roozbahani. "Evaluation of Airflow Sensitivity to the Truncation Level of a Realistic Human Airway Model in an Accurate Numerical Simulation". سامانه مدیریت نشریات علمی, 12, 4, 1401, 403-416. doi: 10.31661/jbpe.v0i0.2201-1452
Farhoodi, Saeed, Heidarinejad, Ghassem, Roozbahani, Mohammad Hossein. (1401). 'Evaluation of Airflow Sensitivity to the Truncation Level of a Realistic Human Airway Model in an Accurate Numerical Simulation', سامانه مدیریت نشریات علمی, 12(4), pp. 403-416. doi: 10.31661/jbpe.v0i0.2201-1452
Farhoodi, Saeed, Heidarinejad, Ghassem, Roozbahani, Mohammad Hossein. Evaluation of Airflow Sensitivity to the Truncation Level of a Realistic Human Airway Model in an Accurate Numerical Simulation. سامانه مدیریت نشریات علمی, 1401; 12(4): 403-416. doi: 10.31661/jbpe.v0i0.2201-1452

Evaluation of Airflow Sensitivity to the Truncation Level of a Realistic Human Airway Model in an Accurate Numerical Simulation

Journal of Biomedical Physics and Engineering
مقاله 10، دوره 12، شماره 4، مهر و آبان 2022، صفحه 403-416    اصل مقاله (2.21 M)
نوع مقاله: Original Research
شناسه دیجیتال (DOI): 10.31661/jbpe.v0i0.2201-1452
نویسندگان
Saeed Farhoodi1؛ Ghassem Heidarinejad2؛ Mohammad Hossein Roozbahani* 3
1MSc, Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
2PhD, Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
3PhD, School of Advanced Technologies, Iran University of Science and Technology, Tehran, Iran
چکیده
Background: The truncation level of human airways is an influential factor in the analysis of respiratory flow in numerical simulations. Due to computational limitations and limited resolution of diagnostic medical imaging equipment, a truncated geometry of airways is always investigated. 
Objective: This study aimed to employ image-based geometries with zero generation and 5th-generation truncation levels and assess bronchial airways truncation’s effect on tracheal airflow characteristics.
Material and Methods: In this numerical study, computational fluid dynamics was employed to solve the respiratory flow in a realistic human airway model using the large eddy simulation technique coupling with the wall-adapting local eddy-viscosity (WALE) sub-grid scale model. The accuracy of numerical simulations was ensured by examining the large eddy simulation index of quality and Kolmogorov’s K-5/3 law. 
Results: The turbulent kinetic energy along the trachea has increased abnormally in the geometry with the zero-generation truncation level, and more severe fluctuations occurred in the velocity field of this geometry, which increased the tendency of each point to rotate. Compared to the extended model, the airflow’s more chaotic behavior prevented larger-scale vortices from forming in the geometry with the zero-generation truncation level. Larger-scale vortices in the extended model caused the primary flow passing next to the vortices to accelerate more intensely, increasing the wall shear stress peaks in this geometry.  
Conclusion: Eliminating the bronchial airways caused changes in tracheal airflow characteristics.
کلیدواژه‌ها
Computer Simulation؛ Respiratory System؛ Bronchial Airways Truncation؛ Flow Structure Study؛ Inhalation؛ Nasal Cavity
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