Fluid–structure interaction analysis for pressurizer surge line subjected to thermal stratification

2011 ◽  
Vol 241 (1) ◽  
pp. 257-269 ◽  
Author(s):  
Dong Gu Kang ◽  
Myung Jo Jhung ◽  
Soon Heung Chang
Keyword(s):  
Thermal Stratification ◽  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Surge Line

Effect of Vertical Pipe Length on the Thermal Stratification in Nuclear Power Plant Surgeline

2008 ◽  
Author(s):  
Young-Jong Kim ◽  
Maan-Won Kim ◽  
Hyun-Soon Lee ◽  
Eunmi Ko
Keyword(s):  
Thermal Stratification ◽  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Pipe Length ◽  
Transient Model ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Vertical Part ◽  
Surge Line

During operating transients of the pressurizer, thermal stratification effect may occur especially in the horizontal parts of the surge line. US NRC requires consideration of thermal stratification in surge line as phenomenon that must be considered in the design basis of the surge line. Generally, the fatigue usage factor of the surge line is comparative high, due to its operating temperature and pressure transients and its thermal stratification loads. In this study we have performed some parametric fluid-structure interaction analyses with different length variables of the vertical part of the surge line to study the relationship between the magnitude of thermal stratification and the length of vertical part of the surge line. The conservativeness of the traditional finite element model for thermal stratification analysis based on the conservative assumption in the surge line was also discussed by comparison of the results of three-dimensional time transient fluid-structure interaction analysis of this study. Stresses calculated with three-dimensional time transient model were considerably reduced comparing with the traditional analysis.

scholarly journals B-Spline Impulse Response Functions of Rigid Bodies for Fluid-Structure Interaction Analysis

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
S. Zhou-Bowers ◽  
D. C. Rizos
Keyword(s):  
Impulse Response ◽  
Dynamic Models ◽  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Rigid Bodies ◽  
The Body ◽  
Impulse Response Functions ◽  
Fluid Structure ◽  
B Spline ◽  
Structure Interaction

Reduced 3D dynamic fluid-structure interaction (FSI) models are proposed in this paper based on a direct time-domain B-spline boundary element method (BEM). These models are used to simulate the motion of rigid bodies in infinite or semi-infinite fluid media in real, or near real, time. B-spline impulse response function (BIRF) techniques are used within the BEM framework to compute the response of the hydrodynamic system to transient forces. Higher-order spatial and temporal discretization is used in developing the kinematic FSI model of rigid bodies and computing its BIRFs. Hydrodynamic effects on the massless rigid body generated by an arbitrary transient acceleration of the body are computed by a mere superposition of BIRFs. Finally, the dynamic models of rigid bodies including inertia effects are generated by introducing the kinematic interaction model to the governing equation of motion and solve for the response in a time-marching scheme. Verification examples are presented and demonstrate the stability, accuracy, and efficiency of the proposed technique.

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