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arXiv 1402.0110math.NAcs.NA
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一种用于流体-复合结构相互作用问题的分区方案

A partitioned scheme for fluid-composite structure interaction problems

Martina Bukac, Suncica Canic, Boris Muha

AI总结:

本文提出一种松散耦合的分区方案,用于解决流体-复合结构相互作用问题,通过线弹性方程和Koiter成员/壳方程分别建模厚层和薄层,采用操作分裂方案实现无条件稳定性,并通过数值实验验证了方案的准确性及薄界面的正则化作用。

摘要:

我们提出了一种松散耦合的分区方案,用于解决流体-复合结构相互作用问题的基准问题。该基准问题由不可压缩、粘性流体与由两层组成的复合结构相互作用构成:一层是与流体接触的薄弹性层,另一层是位于薄层上方的厚弹性层。动机来自血流动力学中的流体-结构相互作用(FSI)。线弹性方程用于建模厚结构层,而Koiter成员/壳方程用于建模作为流体-结构界面的薄结构层,具有质量。提出了一种高效、模块化的操作分裂方案,以模拟耦合的非线性FSI问题。操作分裂方案将弹性动力学结构问题与一个流体问题分离,其中薄结构的惯性作为Robin型边界条件包含在内,以实现无条件稳定性,而无需在时间步内进行任何子迭代。为在移动域上定义的完全非线性FSI问题推导了与无条件稳定性相关的能量估计。通过两个有指导性的数值例子测试了该方案的性能,其中显示该方案在时间上至少是一阶准确的。第二个例子揭示了FSI问题中一种新现象:薄流体-结构界面的存在正则化了完整的FSI问题的解。

英文摘要:

We present a loosely-coupled partitioned scheme for a benchmark problem in fluid-composite structure interaction. The benchmark problem proposed here consists of an incompressible, viscous fluid interacting with a composite structure that consists of two layers: a thin elastic layer which is in contact with the fluid, and a thick elastic layer which sits on top of the thin layer. The motivation comes from fluid-structure interaction (FSI) in hemodyam- ics. The equations of linear elasticity are used to model the thick structural layer, while the Koiter member/shell equations are used to model the thin structural layer which serves as fluid-structure interface with mass. An effi- cient, modular, operator-splitting scheme is proposed to simulate solutions to the coupled, nonlinear FSI problem. The operator splitting scheme sepa- rates the elastodynamics structure problem, from a fluid problem in which the thin structure inertia is included as a Robin-type boundary condition to achieve unconditional stability, without requiring any sub-iterations within time-steps. An energy estimate associated with unconditional stability is derived for the fully nonlinear FSI problem defined on moving domains. Two instructive numerical examples are presented to test the performance of the scheme, where it is shown numerically, that the scheme is at least first-order accurate in time. The second example reveals a new phenomenon in FSI problems: the presence of a thin fluid-structure interface with mass regularizes solutions to the full FSI problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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