Fluid-structure interaction analysis of turbulent pulsatile flow within a layered aortic wall as related to aortic dissection
Fluid-structure interaction analysis of turbulent pulsatile flow within a layered aortic wall as related to aortic dissection
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DOI：
10.1016/j.jbiomech.2009.08.010
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发表时间：
2009-12-11
影响因子：
2.4
通讯作者：
Berguer, Ramon
中科院分区：
文献类型：
--
作者：
Khanafer, Khalil;Berguer, Ramon
在轴对称的降主动脉三层壁面模型中，对湍流脉动流动和壁面力学进行了数值研究。输运方程的求解采用基于加权残值法的有限元方法。本文采用全耦合流固耦合(FSI)分析方法。我们计算了冯·米塞斯的壁应力、流线和流体压力等值线。研究结果表明，在介质层中，最大壁应力和最大剪应力最大。主动脉壁相邻各层弹性性质的差异可能决定了中层夹层的发生。此外，主动脉壁内血肿的存在对作用于内层的最大壁应力有显著影响。(C)2009爱思唯尔有限公司。保留所有权利
Turbulent pulsatile flow and wall mechanics were studied numerically in an axisymmetric three-layered wall model of a descending aorta. The transport equations were solved using the finite element formulation based on the Galerkin method of weighted residuals. A fully-coupled fluid-structure interaction (FSI) analysis was utilized in this investigation. We calculated Von Mises wall stress, streamlines and fluid pressure contours. The findings of this study show that peak wall stress and maximum shear stress are highest in the media layer. The difference in the elastic properties of contiguous layers of the wall of the aorta probably determines the occurrence of dissection in the media layer. Moreover, the presence of aortic intramural hematoma is found to have a significant effect on the peak wall stress acting on the inner layer. (C) 2009 Elsevier Ltd. All rights reserved