A Conjugate Fluid-Porous Approach for Simulating Airflow in Realistic Geometric Representations of the Human...

Area of Science:

• Biomedical Engineering
• Computational Fluid Dynamics
• Respiratory Physiology

Background:

• Accurate simulation of human lung airflow is crucial for physiological studies.
• Existing computational models face challenges due to the wide range of length scales in the lung.
• Previous studies often used simplified, truncated airway models, limiting their connection to respiratory models.

Purpose of the Study:

• To present a novel modeling paradigm for simulating airflow in the complete human lung.
• To address the complexity arising from the vast separation of length scales between upper airways and alveoli.
• To develop a more efficient and practical simulation method for lung physiology.

Main Methods:

• A conjugate fluid-porous formulation was developed for full lung simulation.
• The upper airway was modeled as a fluid region.
• The remainder of the lung was modeled as a coupled porous region.
• Realistic lung geometry derived from computed tomography (CT) images was used.

Main Results:

• The proposed fluid-porous model demonstrated potential for efficient lung simulation.
• The method effectively integrated upper airway fluid dynamics with porous media flow.
• Simulations were performed on realistic lung geometries.

Conclusions:

• The conjugate fluid-porous modeling paradigm offers a practical solution for full lung airflow simulation.
• This approach overcomes the limitations of simulating the entire lung directly.
• The method shows promise for advancing physiological studies of lung function.