摘要
流固耦合作用对血液的流动速度、回流速度和壁面剪应力有较大的影响。但迄今已有的研究工作较少考虑血液-血管相互作用和生理脉动作用的影响,可能难以真实地反映血液在主动脉弓中的流动情况。将升主动脉、主动脉弓和降主动脉联系起来,根据生理脉动流条件,利用有限元软件,分析流固耦合作用下主动脉弓中的血液流动问题。研究表明,流固耦合作用对血液流动速度、回流速度和壁面剪应力的变化趋势影响较小,对血液回流速度幅值、壁面剪应力幅值影响较大。结果表明:在心脏收缩与舒张转换期,主动脉内的血液向心室方向反流;考虑流固耦合作用总体上降低血液回流速度的幅值;在流固耦合作用下,壁面最大剪应力幅值比非流固耦合偏低约25%。
The fluid-structure interaction （FSI） greatly affects blood blow, reserved flow and wall shear stress in aortic arch. But so far, few investigations have considered the interaction between blood and vessels and the influence from psychological pulse. In this paper, the ascending aorta, the aortic arch and the descending aorta were considered in the geometric model. The FSI was used to study the blood flow in the aortic arch according to the physiologically pulsatile conditions. It was demonstrated that the velocity of blood and wall shear stress in aortic arch were rarely affected by FSI, but the FSI had great affects on the magnitude of blood flow and wall shear stress in the aortic arch. At the moment when systole switching into diastole, the blood flow produced countereurrent; The reversed flow was lower considering FSI; The wall shear stress was reduced by 25% in FSI compared with rigid wall.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
2008年第3期405-409,共5页
Chinese Journal of Biomedical Engineering
基金
西北工业大学基础研究基金(w018102)
关键词
主动脉弓
流固耦合
剪应力
回流
aortic arch
fluid-structure interaction
wall shear stress
reserved flow
