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首页> 外文期刊>Computer Methods in Applied Mechanics and Engineering >Sequentially-Coupled Arterial Fluid-Structure Interaction (SCAFSI) technique
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Sequentially-Coupled Arterial Fluid-Structure Interaction (SCAFSI) technique

机译：顺序耦合动脉流固耦合技术（SCAFSI）

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The Sequentially-Coupled Arterial Fluid-Structure Interaction (SCAFSI) technique is one of the special techniques developed recently by the Team for Advanced Flow Simulation and Modeling (T☆AFSM) for FSI modeling of blood flow and arterial dynamics. The SCAFSI technique, which was introduced as an approximate FSI approach in arterial fluid mechanics, is based on the assumption that the arterial deformation during a cardiac cycle is driven mostly by the blood pressure. In the SCAFSI, first we compute a "reference" arterial deformation as a function of time, driven only by the blood pressure profile of the cardiac cycle. Then we compute a sequence of updates involving mesh motion, fluid dynamics calculations, and recomputing the arterial deformation. Although the SCAFSI technique was developed and tested in conjunction with the stabilized space-time FSI (SSTFSI) technique, it can also be used in conjunction with other FSI modeling techniques categorized as moving-mesh methods. The SSTFSI technique is based on the Deforming-Spatial-Domain/Stabilized Space-Time (DSD/SST) formulation and includes the enhancements introduced recently by the T☆AFSM. The arterial structures can be modeled with the membrane or continuum elements, both of which are geometrically nonlinear, and the continuum element can be made of linearly-elastic or hyperelastic material (Mooney-Rivlin or Fung). Here we provide an overview of the SCAFSI technique and present a number of test computations for abdominal aortic and cerebral aneurysms, where the arterial geometries used in the computations are close approximations to the patient-specific image-based data.
机译：顺序耦合动脉流体-结构相互作用（SCAFSI）技术是高级流动仿真和建模团队（T☆AFSM）最近开发的用于对血流和动脉动力学进行FSI建模的特殊技术之一。在动脉流体力学中作为近似FSI方法引入的SCAFSI技术是基于这样的假设，即心动周期中的动脉变形主要由血压驱动。在SCAFSI中，首先我们计算“参考”动脉变形随时间的变化，仅受心动周期的血压曲线驱动。然后，我们计算一系列更新，包括网格运动，流体动力学计算以及重新计算动脉变形。尽管SCAFSI技术是与稳定的时空FSI（SSTFSI）技术一起开发和测试的，但它也可以与归类为移动网格方法的其他FSI建模技术结合使用。 SSTFSI技术基于变形空间域/稳定时空（DSD / SST）公式，并包括T☆AFSM最近引入的增强功能。动脉结构可以用膜或连续体元素建模，它们都是几何非线性的，并且连续体元素可以由线弹性或超弹性材料（Mooney-Rivlin或Fung）制成。在这里，我们提供了SCAFSI技术的概述，并介绍了腹主动脉和脑动脉瘤的许多测试计算，其中计算中使用的动脉几何形状非常接近于基于患者特定图像的数据。

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