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arXiv 1601.00664math.NAcs.NA
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刚体耦合方案及其扩展的稳定性与收敛性分析:用于流固耦合交互

Stability and convergence analysis of the kinematically coupled scheme and its extensions for the fluid-structure interaction

University of Notre Dame(圣母大学);University of Zagreb(萨格勒布大学)

Martina Bukac, Boris Muha

AI总结:

本文分析了用于流固耦合交互的松散耦合方案及其扩展的稳定性与收敛性,特别探讨了β方案的无条件稳定性及β=1时的最优时间收敛性。

摘要:

本文分析了用于流固耦合交互的松散耦合方案及其扩展的稳定性与收敛性。我们考虑了一个基准问题,其中结构用一般薄结构模型建模,流体与结构的耦合是线性的。我们推导了β方案扩展的能量估计,证明了其无条件稳定性。此外,我们首次展示了当β=1时的最优、一阶时间收敛性估计。我们进一步讨论了这些结果对其他流固耦合问题的扩展,特别是流体-厚结构耦合问题。理论稳定性与收敛性结果通过数值实验得到支持。

英文摘要:

In this work we analyze the stability and convergence properties of a loosely-coupled scheme, called the kinematically coupled scheme, and its extensions for the interaction between an incompressible, viscous fluid and a thin, elastic structure. We consider a benchmark problem where the structure is modeled using a general thin structure model, and the coupling between the fluid and structure is linear. We derive the energy estimates associated with the unconditional stability of an extension of the kinematically coupled scheme, called the $β$-scheme. Furthermore, for the first time we present \textit{a priori} estimates showing optimal, first-order in time convergence in the case when $β=1$. We further discuss the extensions of our results to other fluid-structure interaction problems, in particular the fluid-thick structure interaction problem. The theoretical stability and convergence results are supported with numerical examples.

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