有锥度角的主动脉弓血液脉动流数值分析

Numerical Simulation of Pulsating Blood Flow in the Aortic Arch with Tapered Angle

目的 探求在正常生理脉动流条件下主动脉弓内血液流动速度和压力脉动分布 ,为动脉粥样硬化的成因和排除方法的研究提供理论依据。方法 运用计算流体力学方法和血流动力学的基本原理 ,对具有锥度角的主动脉弓内血液脉动流动进行数值模拟和可视化分析。结果 计算获得了具有锥度角的主动脉弓内血液流动在心动周期不同时刻的压力分布、速度分布、流线分布。结论 主动脉弓内的血液脉动流流态表现复杂的原因是多方面的 ,而其中最为重要的原因就是主动脉弓的锥度角和曲率。

Objective To study the distributions of velocity and pressure of blood within the aortic arch under normal physiological pulsatile flow conditions in order to provide fundamental theories for the genesis of an arteriosclerosis and its prevention. Method By virtue of the CFD and the fundamental of hemodynamics,the paper gives numerical simulations and flow visualizations of pulsating blood flow in the aortic arch with a tapered angle. Results The distributions of velocity,pressure and path line for the blood flow of the aortic arch with a tapered angle are obtained as a function of time in the cardiac circle. Conclusion There are a lot of causes which result in the complications of pulsating blood flow in the aortic arch.The most important two causes among them are the tapered angle and the curvature of the aortic arch.