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心脏主动脉双叶瓣流固耦合模型定常流场数值的分析

ISSN号：1673-8225
期刊名称：中国组织工程研究与临床康复
时间：0
页码：1413-1418
语言：中文
分类：R318.01[医药卫生—生物医学工程;医药卫生—基础医学]
作者机构：[1]中国矿业大学机电学院, [2]材料学院摩擦学与可靠性研究所,江苏省徐州市221008
相关基金：国家自然科学基金重点项目（50535050）
相关项目：植入假体的生物摩擦学关键基础问题研究

中文摘要：

目的：人工心脏瓣膜置换术后的并发症均与心瓣膜置换后引起的血流特性紊乱有关,因此分析心脏主动脉位置双叶人工机械心瓣/血液耦合系统的血流动力学特性和瓣叶机械应力分布情况,为机械心瓣的设计、优化和临床研究提供一定理论依据。方法：采用大型有限元分析软件ANSYS中的CFD（计算流体动力学）模块并运用顺序耦合分析方法分别建立物理环境和结构环境对双叶人工机械心脏瓣膜与其周围血液进行单向流固耦合分析。结果：获得了瓣膜在稳态流动情况下合理的血流速度场、压力场和流体切应力的分布情况及瓣阀的机械应力分布图。在减速时相下,人工机械瓣的速度场出现明显的湍流区、回流区及漩涡区;跨瓣压差较小,压力场有低压力分布;最大雷诺切应力出现在瓣叶窄流道附近,下游壁面附近有低切应力（雷诺切应力）分布,且峰值切应力远离壁面;人工机械瓣叶上无应力集中现象产生。结论：采用大型有限元分析软件ANSYS,建立了主动脉机械双叶瓣-血液耦合运动的两维数值模型,初步采用CFD中的顺序耦合分析方法对血液通过主动脉位置的人工机械瓣进行了单向流固耦合分析的方法是可行的。

英文摘要：

AIM： The postoperative complication following artificial cardiac valve replacement is related to the disorder blood flow induced by valve replacement, thus this study is designed to study the hemodynamics of the aortic artificial mechanical prosthetic heart valves/blood coupled system, explore the mechanical stress distribution of valve bileaflet, and provide theoretical evidences for the design, optimization and clinical application of mechanical valve. METHODS： With a large finite element analysis software ANSYS CFD （computational fluid dynamics） module, the steady flow of blood through prosthetic artificial mechanical heart valve was simulated numerically using the one-way sequence fluid-solid coupling method under the physical environment and structure environment, respectively. PESULT3： The reasonable results for velocity, pressure, fluid shear stress plot and mechanical stress plot of occluder were obtained under steady flow. The results illustrated that the turbulent flow, recirculation and vortices areas of artificial valve were presented at negative acceleration. The transvalvular gradients of the valve were small and the pressure contour had low-pressure distribution. The highest shear stress occurred in the vicinity of the valve＇s narrow flow path, while low shear stress was found surrounding the blood wall of downstream. Moreover, the shear stress peaked even far away from walls. There was no stress concentration at the occluder of the mechanical valve. CONCLUSION： Employing a large finite element analysis software ANSYS, a two dimensional model of the aortic mechanical valve-blood coupling is established, and it is feasible for the preliminary use of one-way sequence coupling method of CFD to analyze the blood through prosthetic artificial valve.

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