Related Experiment Video
Updated: Jan 16, 2026
09:39
A Microfluidic Model of Biomimetically Breathing Pulmonary Acinar Airways
Published on: May 9, 2016
8.3K
Multiscale simulation of respiratory airflow using physiologically consistent geometry and boundary conditions in
Quoc Hung Nguyen1, Sungchul Huh2, Kum Ju Chae3
1School of Mechanical Engineering & IEDT, Kyungpook National University, Daegu, South Korea.
Computers in Biology and Medicine
|September 27, 2025
Summary
This study introduces a new computational fluid dynamics (CFD) model for human airway simulations, improving accuracy in airflow and particle deposition analysis for respiratory system research.
Area of Science:
- Biomedical Engineering
- Respiratory Physiology
- Computational Science
Background:
- Current computational fluid dynamics (CFD) models often lack realistic upper and lower airways, limiting accuracy in respiratory system simulations.
- Integrating CT-unresolved higher-generation airways remains a challenge in existing models.
Purpose of the Study:
- To develop a physiologically consistent CFD model of the human airway using CT data and artificial extensions.
- To investigate the impact of a hybrid Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES) turbulence model and an airway mesh smooth learning (AMSL) technique on airflow and particle deposition.
Main Methods:
- A CT-based CFD model was created in OpenFOAM, incorporating artificial airway extensions to transitional bronchioles.
- A hybrid RANS-LES turbulence model and AMSL technique were employed for geometry construction and simulation.
- Physiologically consistent boundary conditions were derived from 1D network simulations.
Main Results:
- Pressure distribution showed a non-monotonic decrease in the upper respiratory tract and a continual decrease in the lower tract.
- The hybrid RANS-LES model yielded results comparable to LES and superior to traditional RANS models regarding flow patterns and particle deposition.
- The AMSL technique significantly impacted airflow behavior and particle deposition, underscoring the importance of accurate geometry processing.
Conclusions:
- The developed physiologically consistent CFD model offers enhanced accuracy and reliability for clinical and research applications.
- The integrated airway model, from upper to distal airways, improves understanding of multiscale airflow dynamics in the lungs.
Keywords:
Airway surface smoothingComputational fluid dynamicsComputed tomographyHybrid RANS-LESParticle depositionMore Related Videos
Related Concept Videos
01:30Application of Integration: Problem Solving
37
The process of breathing involves the periodic intake and expulsion of air, known as the respiratory cycle, which typically lasts about five seconds. Modeling the volume of air inhaled into the lungs as a function of time provides insight into both the dynamics and efficiency of pulmonary ventilation. This volume is determined by integrating the airflow rate over time, which captures the cumulative effect of air entering the lungs.Sinusoidal Model of AirflowAirflow during respiration is not...
37
01:30Typical Model Studies
619
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
619
01:07Laminar and Turbulent Flow
10.6K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
10.6K
01:09Turbulent Flow: Problem Solving
385
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
385
01:24Laminar Flow: Problem Solving
507
Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
507
01:16Physical Principles Governing Gas Exchange
3.3K
Gas behavior plays a vital role in understanding bodily processes such as external and internal respiration. External respiration involves the diffusion of oxygen into the blood and carbon dioxide out of it in the lungs. In contrast, internal respiration happens in body tissues, where these gases move in opposite directions.
Gas Laws Governing Respiration
The behavior of gases is guided by Dalton's Law of partial pressures and Henry's Law.
Dalton's Law asserts that the total...
Gas Laws Governing Respiration
The behavior of gases is guided by Dalton's Law of partial pressures and Henry's Law.
Dalton's Law asserts that the total...
3.3K