摘要
本文采用任意拉格朗日－欧拉（ＡＬＥ）有限单元法，将血液视为不可压缩粘性流体，同时将人工机械瓣简化为定轴转动刚体，建立了机械心瓣－血液耦合运动二维计算模型，解决了人工机械瓣启闭过程的计算问题．对Ｓｔ．Ｊｕｄｅ瓣启闭过程的数值分析表明：１．Ｓｔ．Ｊｕｄｅ瓣启闭过程包括四个阶段，即：Ⅰ．开启相；Ⅱ．开启保持相；Ⅲ．关闭相；Ⅳ．关闭保持相．２．Ｓｔ．Ｊｕｄｅ瓣关闭时回流明显，伴有显著水击效应．３．在启闭过程中，高剪力区位于两瓣叶间及瓣环附近．本文的研究突破了以非耦合的方法研究心瓣启闭过程的局限性．
Employing arbitrary Lagrangian-Eulerian(ALE) finite clement method, this paper studies the opening and closing process of a St. Jude medical valye through a two dimensional model of the mechanical valve-blood interact ion in which the valve is regarded as a rigid body rotat lug around a fixed point, and the blood is simplified as viscous incompressible Newtonian fluid. The numerical analysis of the opening and closing behaviour of as St. Jude valve suggest.ed that: 1. The whole opening and closing process of an artificial mechanical valve is consisted of four phases: Ⅰ. Opening phases:Ⅱ. Open illg maintenance phase: Ⅲ. Closing phase; Ⅳ. Closing maintenance phase. 2. The St. Jude medical valve closes with prominent regurgitat ion which results in waterhammer effect.3. During the opening and closing process of the St. Jude valve, high shear stresses occurs in the middle region of the two leaflets and on the valve ring. The present model has made a breakthrough on the coupling computat ional analysis considering the interactive movenent of the valve and blood.
出处
《应用数学和力学》
CSCD
北大核心
1996年第5期387-396,共10页
Applied Mathematics and Mechanics
基金
国家自然科学基金
博士点基金
关键词
人工瓣膜
ALE有限元
启闭过程
有限元
artificial mechanical valve, ALE finite element method, fluid-solid interaction
