A robust and efficient valve model based on resistive immersed surfaces
A robust and efficient valve model based on resistive immersed surfaces
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DOI：
10.1002/cnm.2474
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发表时间：
2012-09-01
影响因子：
2.1
通讯作者：
Gerbeau, Jean-Frederic
中科院分区：
文献类型：
--
作者：
Astorino, Matteo;Hamers, Jeroen;Gerbeau, Jean-Frederic
心脏瓣膜的建模过程。不是对完整的瓣叶运动进行建模，而是在开放和闭合配置中对瓣叶进行建模。每个配置的几何形状可以例如从体内图像数据定义。与完整的流体-结构相互作用和接触建模相比，该方法能够显著节省计算量，同时保持阀附近的真实三维速度和压力分布，这在集中参数建模中是不可能的。瓣叶被建模为浸没的固定表面，其上分配有流动阻力。基于局部流动条件，为每个配置分配的阻力值被改变以在打开和关闭状态之间切换阀门。该公式允许跨阀的压力是不连续的。为了说明该模型的多功能性，提出了现实和患者特定的模拟，以及与完整的流体结构相互作用模拟的比较。版权所有（c）2012约翰威利父子有限公司
A procedure for modeling the heart valves is presented. Instead of modeling complete leaflet motion, leaflets are modeled in open and closed configurations. The geometry of each configuration can be defined, for example, from in vivo image data. This method enables significant computational savings compared with complete fluidstructure interaction and contact modeling, while maintaining realistic three-dimensional velocity and pressure distributions near the valve, which is not possible from lumped parameter modeling. Leaflets are modeled as immersed, fixed surfaces over which a resistance to flow is assigned. On the basis of local flow conditions, the resistance values assigned for each configuration are changed to switch the valve between open and closed states. This formulation allows for the pressure to be discontinuous across the valve. To illustrate the versatility of the model, realistic and patient-specific simulations are presented, as well as comparison with complete fluidstructure interaction simulation. Copyright (c) 2012 John Wiley & Sons, Ltd.