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首页> 外文期刊>Journal of Computational Science and Technology >Practical Performances of Non-linear Algorithms for Partitioned Iterative Method of Fluid-Structure Interaction Problems
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Practical Performances of Non-linear Algorithms for Partitioned Iterative Method of Fluid-Structure Interaction Problems

机译：流体-结构相互作用问题的分区迭代方法的非线性算法的实际性能

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References(18) Recently, tightly coupled partitioned iterative methods have drawn a great deal of attentions due to easy implementation and encapsulation features, and several nonlinear algorithms have been proposed so far. However, their practical performances have not been well understood yet. This paper describes the intensive parametric study on convergence and stability performances of four nonlinear algorithms and their relaxed variations for partitioned iterative methods of steady / unsteady fluid-structure interaction (FSI) problems. Here we choose three typical FSI problems as test problems, i.e. (1) Collapsible channel as a steady problem, (2) Cavity with flexible bottom membrane and (3) Channel with flexible wall as unsteady problems. Efficiency and robustness dependency of those nonlinear algorithms on physical parameters such as degree of nonlinearity, added mass effect, time step, and on control parameters peculiar to each algorithm are clarified. Through those tests, we demonstrate that Broyden method is the fastest algorithm for easy FSI problems such as weakly coupling and Line Search method has robustness even for difficult FSI problems such as strongly coupling.
机译：参考文献（18）近来，紧密耦合的分区迭代方法由于易于实现和封装特性而备受关注，到目前为止，已经提出了几种非线性算法。但是，它们的实际性能还没有被很好地理解。本文描述了对四种非线性算法的收敛性和稳定性能及其针对稳态/非稳态流体-结构相互作用（FSI）问题的分区迭代方法的松弛变化进行的密集参数研究。在这里，我们选择三个典型的FSI问题作为测试问题，即（1）可折叠通道是一个稳定问题，（2）具有柔性底膜的空腔和（3）具有柔性壁的通道是不稳定问题。阐明了这些非线性算法对物理参数（例如非线性程度，附加质量效应，时间步长）以及每种算法特有的控制参数的效率和鲁棒性的依赖。通过这些测试，我们证明了Broyden方法是解决诸如弱耦合之类的简单FSI问题最快的算法，而Line Search方法即使对于诸如强耦合之类的FSI难题也具有鲁棒性。

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