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Three-dimensional steady flow through a bifurcation.
C N Yung1, K J De Witt, T G Keith
1Department of Chemical Engineering, University of Toledo, Ohio 43606.
Journal of Biomechanical Engineering
|May 1, 1990
Summary
This study numerically analyzed fluid flow in bifurcated channels, revealing secondary flow patterns and high shear stress near the branch apex. These findings are crucial for understanding vessel wall damage risks.
Area of Science:
- Fluid Dynamics
- Computational Mechanics
- Biomedical Engineering
Background:
- Understanding fluid dynamics in bifurcating vessels is critical for diagnosing and treating cardiovascular diseases.
- Previous 2D simulations could not capture complex secondary flow phenomena.
Purpose of the Study:
- To numerically analyze steady, incompressible, Newtonian fluid flow through a symmetric bifurcated rigid channel.
- To investigate the effects of secondary flow and wall shear stress in a 3D model.
Main Methods:
- Solving three-dimensional Navier-Stokes equations using a control volume approach and SIMPLE algorithm.
- Utilizing coordinate transformation for numerical discretization.
- Analyzing particle trajectories and wall shear stress.
Main Results:
- Predicted velocity patterns qualitatively matched experimental data.
- Identified significant secondary flow effects not seen in 2D simulations.
- Observed reversed flow near the outer branch wall (except at low Reynolds numbers).
- Calculated high wall shear stress at the branch apex, potentially causing vessel damage.
Conclusions:
- 3D simulations provide a more accurate representation of fluid flow in bifurcations.
- Secondary flows play a significant role in the hemodynamics of bifurcated channels.
- High shear stress at the apex poses a risk to vessel wall integrity.