三维锥形动脉中脉动流的数值模拟研究

Numerical Simulation of Pulsating Blood Flow in the Three-dimensional Aortic with a Tapered Angel

在正常生理脉动流下,运用计算流体力学方法和血流动力学的基本原理,对三维渐缩锥形弯曲动脉内血液脉动流进行数值模拟和可视化分析.计算获得了具有锥度角的弯曲动脉内血液流动在心动周期内不同时刻的压力分布、速度分布.通过对弯曲动脉及其形成局部狭窄后,管腔内的血液流速和压力分布的研究,为动脉粥样硬化的成因及排除方法的研究提供更可靠的理论依据.结果表明,锥度角和动脉管壁的曲率变化对非定常状态下的脉动流的压力、速度分布、血流的局部能量损失的影响很大,这与实际情况相符.

By using the CFD and the fundamental of hemodynamics, this paper gives numerical simulations and flow visualization of pulsating blood flow in the bended aortic with a tapered angel under normal physiological pulsatile flow condition. The distributions of velocity, pressure for the blood flow of the bending aortic with a tapered angel are obtained at different times in a whole cardiac period. Through the studying of the distributions of velocity, pressure for the blood flow of the bended aortic after appearance of local straitness, the paper provides more reliable academic gist for the reason of forming atheroma and how to obviate it. The results of numerical simulation indicate that, the influence of the tapered angel and the change of curvature of aortic arch on the distributions of velocity, and pressure for the pulsatile flow, and the local energy loss is very great.