On blowdown analysis with efficient and reliable direct time integration methods for wave propagation and fluid-structure-interaction response

•Wave propagation and fluid-structure-interaction dynamic response.•Validation of iterative and direct fluid-structure-interaction CFD and FE models.•Efficiency, accuracy and reliability of time integration methods in linear and non-linear blowdown analyses.•Bathe time integration method. In literat...

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Bibliographic Details
Published in:Computers & structures Vol. 216; pp. 1 - 14
Main Authors: Nilsson, Kenth, Tornberg, Fredrik
Format: Journal Article
Language:English
Published: New York Elsevier Ltd 01.05.2019
Elsevier BV
Subjects:
Bathe method
Blowdown
Computing time
Contact pressure
Fluid structure interaction
Implicit methods
Implicit time integration
Iterative methods
Methods
Nonlinear structural dynamics
Nuclear reactor components
Potential based fluid
Pressure vessels
Propagation
Superposition (mathematics)
Time integration
Vessels
Wave propagation
Potential based fluid
Nonlinear structural dynamics
Wave propagation
Bathe method
Fluid structure interaction
Implicit time integration
ISSN:0045-7949, 1879-2243
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Summary:•Wave propagation and fluid-structure-interaction dynamic response.•Validation of iterative and direct fluid-structure-interaction CFD and FE models.•Efficiency, accuracy and reliability of time integration methods in linear and non-linear blowdown analyses.•Bathe time integration method. In literature time integration methods are described separately for wave propagation or structural dynamic problems. In this paper we focus on implicit methods for problems that involve simultaneous wave propagation and strong fluid-structure-interaction response. As example we show methods and models for nuclear pressure vessel blowdown analysis. We present validation against measurements from literature for three different ways to perform this analysis. These are: 2-way iterative fluid-structure-interaction (FSI) between CFD and FE codes, direct 2-way FSI in the FE code and sequential 1+2-way FSI. The CFD and FE codes provide different time integration methods. Here we investigate the trapezoidal and composite methods, in the FE code the Bathe method. We show that the selected validation problem is linear and follows the principle of superposition and can be solved with the all-linear fluid-structure FE model, with the trapezoidal rule for computational efficiency. On the contrary, in applied analyses of reactor pressure vessels structural non-linearities must often be included, such as contact, friction stick-slip and plasticity. We show that for non-linear fluid-structure FE models the Bathe method is efficient and reliable. The Bathe method provides high accuracy in both the wave propagation and the fluid-structure-interaction response.
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ISSN:0045-7949
1879-2243
DOI:10.1016/j.compstruc.2019.03.002