Numerical simulation of flow fields in a tube with two branches

Area of Science:

• Fluid Dynamics
• Biomedical Engineering
• Computational Mechanics

Background:

• Blood flow in branched vessels is complex and influences cardiovascular health.
• Understanding flow patterns in bifurcations is key to studying conditions like atherosclerosis.
• Previous studies often focused on single branches, leaving multi-branched systems less understood.

Purpose of the Study:

• To numerically simulate and analyze flow fields in double-branched tubes.
• To investigate the impact of branch arrangement (same side vs. opposite side) on flow dynamics.
• To identify regions of low or oscillating shear stress and their relation to vessel geometry.

Main Methods:

• Employed a numerical calculation procedure based on the finite volume method.
• Simulated flow fields in double-branched tube configurations with varying branch positions.
• Analyzed baseline flow fields and inter-branch flow interactions.

Main Results:

• When branches are on the same side, low shear regions occur on ventral walls and the dorsal main tube.
• With opposite branches, low shear regions shift laterally in the main tube as staggering distance increases.
• Flow patterns near branches differ significantly from single-branched tubes, especially with proximity.

Conclusions:

• Branch configuration critically alters flow fields and shear stress distribution in double-branched tubes.
• The findings highlight the need for careful consideration of flow patterns in multi-branched vessels for plaque localization.
• Numerical results align qualitatively with experimental observations, validating the simulation approach.