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首页> 外文期刊>Simulation modelling practice and theory: International journal of the Federation of European Simulation Societies >Finite element analysis of blood flow characteristics in a Ventricular Assist Device (VAD)
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Finite element analysis of blood flow characteristics in a Ventricular Assist Device (VAD)

机译：心室辅助装置（VAD）中血流特征的有限元分析

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摘要

The replacement or augmentation of failing human organs with artificial devices and systems has been an important element in health care for several decades. There are a lot of geometrical and flow considerations in the artificial organs that are developed to perform in contact with the blood particles. For example, preventing the stagnation, high pressure and shear regions is an important consideration in artificial organ design. In this paper, the geometrical and boundary conditions for the blood flow in the HeartSaver Ventricular Assist Device (VAD) are studied using the numerical solution of the governing equations. In order to provide the interaction between the blood and the elastic diaphragm and between the blood and the inlet/outlet valves, the Fluid-Structural Interaction (FSI) approach is used in this study. Arbitrary Lagrangian-Eulerian (ALE) Finite Element Method (FEM) formulation is used for the numerical solution of the flow domain. Blood and the driving fluid are assumed as isothermal, Newtonian, viscose and incompressible fluids. The numerical solution has provided the required characteristics for the evaluation of the performance of the VAD in contact with the realistic flow conditions. Although they present the formation of wakes in the blood chamber, no stagnation points and high shear rate zones are detected in the blood chamber.
机译：几十年来，用人工装置和系统替代或增强衰竭的人体器官一直是医疗保健中的重要因素。人造器官在与血液颗粒接触时具有许多几何和流动方面的考虑。例如，在人造器官设计中，防止停滞，高压和剪切区域是重要的考虑因素。在本文中，使用控制方程的数值解来研究HeartSaver心室辅助设备（VAD）中血流的几何和边界条件。为了提供血液与弹性隔膜之间以及血液与入口/出口阀之间的相互作用，本研究中使用了流体-结构相互作用（FSI）方法。拉格朗日-欧拉（ALE）有限元方法（FEM）公式用于流域的数值求解。血液和驱动流体被假定为等温，牛顿，粘胶和不可压缩流体。数值解提供了与实际流动条件相联系的VAD性能评估所需的特性。尽管它们在血腔中形成尾流，但在血腔中未检测到停滞点和高剪切率区域。

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