ALE FINITE ELEMENT ANALYSIS OF THE OPENING AND CLOSING PROCESS OF THE ARTIFICIAL MECHANICAL VALVE

ＡＬＥＦＩＮＩＴＥＥＬＥＭＥＮＴＡＮＡＬＹＳＩＳＯＦＴＨＥＯＰＥＮＩＮＧＡＮＤＣＬＯＳＩＮＧＰＲＯＣＥＳＳＯＦＴＨＥＡＲＴＩＦＩＣＩＡＬＭＥＣＨＡＮＩＣＡＬＶＡＬＶＥ（张建海）（陈大鹏）（邹盛铨）ＡＬＥＦＩＮＩＴＥＥＬＥＭＥＮＴＡＮＡＬＹＳＩＳＯＦＴ...

Ale finite element analysis of the opening and closing process of the artificial mechanical valve

Employing arbitrary Lagrangian-Eulerian (ALE) finite element method, this poper studies the opening and closing process of a St. Jude medical valve through a two-dimensional model of the mechanical valve-blood interaction in which the valve is regarded as a rigid body rotating around a fixed point, and foe blood is simplified as viscous incompressible Newtonian fluid. The numerical analysis of the opening and closing behaviour of as St. Jude valve suggested that: 1. The whole opening and closing process of an artificial mechanical valve is consisted of four phases: (1) Opening phase; (2) Opening maintenance phase; (3) Closing phase; (4) Closing maintenance phase. 2. The St. Jude medical valve closes with prominent regurgitat which results in water-hammer effect. 3. During the opening and closing process of the St. Jude valve,high shear stresses occur in the middle region of the two leaflets and on the valve ring. The present model has made a breakthrough on the coupling computational analysis considering the interactive movement of the valve and blood.