Morsi Yos S, Yang William W, Wong Cynthia S, Das Subrat
Biomechanics and Tissue Engineering Group, Industrial Research Institute IRIS, Swinburne University of Technology, PO Box 218, Hawthorn, VIC, 3122, Australia.
J Artif Organs. 2007;10(2):96-103. doi: 10.1007/s10047-006-0365-9. Epub 2007 Jun 20.
In this article, a three-dimensional transient numerical approach coupled with fluid-structure interaction for the modeling of an aortic trileaflet heart valve at the initial opening stage is presented. An arbitrary Lagrangian-Eulerian kinematical description together with an appropriate fluid grid was used for the coupling strategy with the structural domain. The fluid dynamics and the structure aspects of the problem were analyzed for various Reynolds numbers and times. The fluid flow predictions indicated that at the initial leaflet opening stage a circulation zone was formed immediately downstream of the leaflet tip and propagated outward as time increased. Moreover, the maximum wall shear stress in the vertical direction of the leaflet was found to be located near the bottom of the leaflet, and its value decreased sharply toward the tip. In the horizontal cross section of the leaflet, the maximum wall shear stresses were found to be located near the sides of the leaflet.
本文提出了一种三维瞬态数值方法，该方法结合流固耦合，用于模拟主动脉三叶心脏瓣膜的初始开启阶段。采用任意拉格朗日-欧拉运动学描述以及合适的流体网格来实现与结构域的耦合策略。针对不同的雷诺数和时间，分析了该问题的流体动力学和结构方面。流体流动预测表明，在小叶初始开启阶段，小叶尖端下游立即形成一个环流区，并随着时间增加向外扩展。此外，发现小叶垂直方向上的最大壁面剪应力位于小叶底部附近，其值朝着尖端急剧下降。在小叶的水平横截面上，最大壁面剪应力位于小叶两侧附近。
