Joda Akram, Jin Zhongmin, Summers Jon, Korossis Sotirios
1 Institute of Medical and Biological Engineering, University of Leeds, Leeds, UK.
2 Cardiopulmonary Regenerative Engineering (CARE) Group, The Centre for Biological Engineering (CBE), Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, UK.
Proc Inst Mech Eng H. 2019 May;233(5):544-553. doi: 10.1177/0954411919837568. Epub 2019 Mar 29.
This study was aimed at assessing the robustness of a fixed-grid fluid-structure interaction method (Multi-Material Arbitrary Lagrangian-Eulerian) to modelling the two-dimensional native aortic valve dynamics and comparing it to the Arbitrary Lagrangian-Eulerian method. For the fixed-grid method, the explicit finite element solver LS-DYNA was utilized, where two independent meshes for the fluid and structure were generated and the penalty method was used to handle the coupling between the fluid and structure domains. For the Arbitrary Lagrangian-Eulerian method, the implicit finite element solver ADINA was used where two separate conforming meshes were used for the valve structure and the fluid domains. The comparison demonstrated that both fluid-structure interaction methods predicted accurately the valve dynamics, fluid flow, and stress distribution, implying that fixed-grid methods can be used in situations where the Arbitrary Lagrangian-Eulerian method fails.
本研究旨在评估一种固定网格流固耦合方法（多材料任意拉格朗日-欧拉法）对二维天然主动脉瓣动力学建模的稳健性，并将其与任意拉格朗日-欧拉法进行比较。对于固定网格方法，使用了显式有限元求解器LS-DYNA，其中生成了流体和结构的两个独立网格，并采用罚函数法处理流体域和结构域之间的耦合。对于任意拉格朗日-欧拉法，使用了隐式有限元求解器ADINA，其中瓣膜结构和流体域使用了两个单独的协调网格。比较表明，两种流固耦合方法都能准确预测瓣膜动力学、流体流动和应力分布，这意味着在任意拉格朗日-欧拉法失效的情况下，可以使用固定网格方法。
