A three-dimensional computational analysis of fluid-structure interaction in the aortic valve
A three-dimensional computational analysis of fluid-structure interaction in the aortic valve
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DOI：
10.1016/s0021-9290(02)00244-0
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发表时间：
2003-01-01
影响因子：
2.4
通讯作者：
Baaijens, FPT
中科院分区：
文献类型：
--
作者：
De Hart, J;Peters, GWM;Baaijens, FPT
对主动脉瓣的数值分析主要集中在舒张期的关闭行为，而不是心脏周期收缩阶段的运动开启和关闭行为。此外，在数值模拟中往往忽略了主动脉瓣系统中的流固耦合作用。研究了这种相互作用在收缩功能期间对瓣膜行为的影响。流体和结构的材料特性的巨大差异以及叶的有限运动使血液-瓣膜相互作用模型复杂化。这阻碍了对在生理条件下运行的瓣膜的数值分析。采用一种基于拉格朗日乘子的虚拟域法来描述计算流体域内的大叶面运动。将该方法应用于带支架主动脉瓣的三维有限元模型。该模型既提供了瓣膜的机械性能，也提供了通过它的血液流动。结果表明，在收缩过程中，带支架瓣膜的瓣叶似乎是在流体运动控制的基本运动学过程中与流体一起运动。(C)2002爱思唯尔科学有限公司。保留所有权利。
Numerical analysis of the aortic valve has mainly been focused on the closing behaviour during the diastolic phase rather than the kinematic opening and closing behaviour during the systolic phase of the cardiac cycle. Moreover, the fluid-structure interaction in the aortic valve system is most frequently ignored in numerical modelling. The effect of this interaction on the valve's behaviour during systolic functioning is investigated. The large differences in material properties of fluid and structure and the finite motion of the leaflets complicate blood-valve interaction modelling. This has impeded numerical analyses of valves operating under physiological conditions. A numerical method, known as the Lagrange multiplier based fictitious domain method, is used to describe the large leaflet motion within the computational fluid domain. This method is applied to a three-dimensional finite element model of a stented aortic valve. The model provides both the mechanical behaviour of the valve and the blood flow through it. Results show that during systole the leaflets of the stented valve appear to be moving with the fluid in an essentially kinematical process governed by the fluid motion. (C) 2002 Elsevier Science Ltd. All rights reserved.