压力驱动圆通道中流体流动特性的数值模拟

Numerical simulation of pressure-driven fluid flow characteristics in round channels

为了研究人造血管中血液的流动特性规律,采用计算流体力学(CFD)方法对压力驱动圆通道中牛顿流体和非牛顿流体的流动特性进行数值模拟研究,获得流体流动的流型、速度场、压力分布规律,并研究压力、通道直径等因素对圆通道中流体流动特性的影响。结果表明:流体流动为定常流动时,牛顿流体和非牛顿流体的速度场在不同直径和压差下分布呈现对称的抛物线型和柱塞型;脉动压力驱动下流体的速度最大值与通道直径无关。这些结果说明通道直径和压差影响流体的流动特性,从而为研究人造血管中的血液流动特性提供了理论依据。

In order to study the blood flow characteristics in artificial blood vessels,using CFD method for nu- merical simulation of pressure-driven Newton fluid and non-Newton fluid flow characteristics in round channels, find out the fluid flow pattern in the round channels, the distribution of velocity field, pressure field distribution, and ex- plore the influence of pressure, channel diameter and other factors on the characteristics of fluid flow in round chan- nels. Simulation results showed that when the fluid flow was stationary flow form, Newtonian fluid and non-Newtoni- an fluid was symmetrical distribution of parabolic type and plunger type. The most value of velocity of fluctuating pressure driven fluid has nothing to do with the channel diameter. These results demonstrated that the channel diam- eter, pressure difference influence the fluid flow characteristics, and provide a theoretical basis for development of small diameter artificial blood vessel and analysis of thrombus formation mechanism.