Numerical simulation of pulsating flow in the aortic arch

Area of Science:

• Cardiovascular fluid dynamics
• Biomedical engineering
• Computational modeling

Background:

• Atherosclerosis is a significant cardiovascular disease.
• Understanding blood flow patterns in the aorta is crucial for predicting disease development.
• Current models may not fully capture the complex transient flow dynamics.

Purpose of the Study:

• To create and utilize a numerical three-dimensional model of the aortic arch.
• To investigate transient fluid flow profiles and their relationship to wall shear stress.
• To explore the potential of computational modeling in predicting sites of pathology.

Main Methods:

• Development of a 3D numerical model of the aortic arch.
• Simulation of velocity fields using physiological inlet velocity data.
• Analysis of flow distribution, velocity variations, and wall shear stress.

Main Results:

• Uniform velocity distribution during increasing inlet velocities.
• Development of low flow and recirculating flow regions in the descending aorta during decreasing velocities.
• Significantly higher velocity variation at the inner wall compared to the outer wall in low-flow regions.
• Low and oscillating wall shear stresses in areas of recirculating flow.

Conclusions:

• Transient fluid flow in the aortic arch can be effectively simulated using numerical models.
• Recirculating flow patterns and associated low wall shear stress may predispose to atherosclerosis.
• Further biological studies are required to validate the predictive capabilities of this model for pathology.
• This model offers a potential tool for understanding the biomechanics of aortic diseases.