Järvinen Esko, Råback Peter, Lyly Mikko, Salenius Juha-Pekka
CSC-Scientific Computing Ltd., Finland.
Med Eng Phys. 2008 Sep;30(7):917-23. doi: 10.1016/j.medengphy.2007.12.008. Epub 2008 Feb 20.
In this paper we apply the artificial compressibility method (ACM) in strongly coupled fluid-structure interaction (FSI) computation of blood flow in an elastic artery. Previously published and here referred to as the ACM/FSI method uses the idea of artificial compressibility by Chorin 1967, except the term of pressure time derivative in the continuity equation is used to mimic the response of the walls, thereby stabilizing the iterative coupling. To reach the aim, we present a new way, the test load method, to improve ACM/FSI computations. In the test load method, the compressibility parameter is computed locally and is based on the mesh deformation of the fluid domain. The functionality of the ACM/FSI coupling with the test load method is demonstrated in an arterial flow simulation, and the combination is shown to provide a robust convergence. In order to get the test cases to correspond better to human physiology, one-dimensional FSI models are combined with the higher dimensional test models.
在本文中，我们将人工可压缩性方法（ACM）应用于弹性动脉中血流的强耦合流固相互作用（FSI）计算。先前发表的（在此称为ACM/FSI方法）采用了1967年乔林提出的人工可压缩性概念，只是连续性方程中的压力时间导数项用于模拟血管壁的响应，从而稳定迭代耦合。为实现这一目标，我们提出了一种新方法——试验载荷法，以改进ACM/FSI计算。在试验载荷法中，可压缩性参数是基于流体域的网格变形在局部进行计算的。在动脉血流模拟中展示了采用试验载荷法的ACM/FSI耦合的功能，并且该组合显示出具有稳健的收敛性。为了使测试案例更好地符合人体生理情况，一维FSI模型与高维测试模型相结合。
