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首页> 外文期刊>Journal of Fluids and Structures >Modelling inertial effects in periodic fluid-structure systems with an homogenisation approach: Application to seismic analysis of tube bundles
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Modelling inertial effects in periodic fluid-structure systems with an homogenisation approach: Application to seismic analysis of tube bundles

机译：用均质化方法对周期性流体结构系统中的惯性效应进行建模：在管束地震分析中的应用

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摘要

Fluid-structure interaction (FSI) is of major importance when describing the dynamic behaviour of nuclear pressure vessels, since the presence of confined fluid strongly influences the response of structures when subjected to external loadings, such as a seismic loading. Accounting for FSI when performing the seismic analysis of nuclear reactors or steam generators can be done through the description of inertial effects, which are predominant in the low frequency domain. Finite element techniques are now of common use in design office to model coupled (quiescent) fluid-structure systems, using standard non-symmetric (u,p) or symmetric (u,p,φ) coupled formulations. When considering complex systems such as a tube bundle in steam generators, producing a finite element model which includes tubes, fluid and structures is a tedious task which is out of reach in many practical applications. A homogenisation method has been proposed which allows FSI modelling of tube bundles: it has been successfully applied to a complex structure. In the aforementioned developments, focus was put on the mathematical and numerical aspects of the method, leaving out some questions regarding the physical interpretation of the calculations. In the present paper, a new insight on the homogenisation approach is exposed with the objective of proposing a formulation of the method based on physical considerations, leading to a correction of the homogenised problem. Enhancement of the method is discussed from an engineering standpoint: it allows for a wider range of applications in the nuclear industry.
机译：当描述核压力容器的动态行为时，流固耦合至关重要（FSI），因为承压流体的存在会在承受外部载荷（例如地震载荷）时强烈影响结构的响应。进行核反应堆或蒸汽发生器的地震分析时，可以通过描述惯性效应来完成FSI的计算，惯性效应在低频域尤为明显。现在，有限元技术已在设计部门普遍使用，以使用标准的非对称（u，p）或对称（u，p，φ）耦合公式对耦合（静态）流体结构系统进行建模。当考虑复杂的系统（例如蒸汽发生器中的管束）时，生成包含管，流体和结构的有限元模型是一项繁琐的任务，在许多实际应用中是无法实现的。已经提出了一种均质化方法，该方法可以对管束进行FSI建模：已成功应用于复杂结构。在前述的发展中，重点放在该方法的数学和数值方面，而忽略了有关计算的物理解释的一些问题。在本文中，针对均质化方法提出了新的见解，其目的是基于物理考虑提出一种方法的提法，从而纠正均质化问题。从工程角度讨论了该方法的增强：它允许在核工业中更广泛的应用。

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