A new three-dimensional variable-node finite element and its application for fluid–solid interaction problems

• Published in: Computer methods in applied mechanics and engineering 2014-11, Vol.281, p.81-105
• Main Authors: Kang, Yong-Soo, Kim, Jungdo, Sohn, Dongwoo, Kim, Jeong Ho, Kim, Hyun-Gyu, Im, Seyoung
• Format: Article
• Language: English
• Subjects: Arbitrary Lagrangian–Eulerian formulation; Continuity; Finite element method; Fluid-solid interactions; Fluid–structure interaction; Joints; Mathematical analysis; Mathematical models; Non-matching interface; Stress transfer; Three dimensional; Variable-node elements
• ISSN: 0045-7825; 1879-2138
• DOI: 10.1016/j.cma.2014.07.026

A new three-dimensional variable-node element is proposed to achieve an efficient connection of non-matching interfaces between dissimilar finite element meshes. The variable-node elements at interfaces are compatible with conventional finite elements, and satisfy the interface conditions of continuity, and completeness across non-matching meshes. The present method thereby provides a seamless connection between dissimilar finite element meshes and a correct load transfer across non-matching interfaces. Therefore, it leads to an efficient approach for solving a class of problems involving the non-matching interfaces such as fluid–solid interaction problems. Numerical examples are presented to show the effectiveness of the present method for solving fluid–solid interaction problems with non-conforming interfaces, and the usefulness and application of the present method are discussed. •A new three-dimensional variable-node element is proposed to achieve an efficient connection of non-matching meshes across their interface.•The new variable-node element passes patch test completely.•Triangulation at the interface makes it possible to solve even for general non-matching problems.•The effectiveness of the method is demonstrated by neatly solving 3-D fluid–solid interaction problems with non-conforming interfaces.