scholarly journals Dynamic analysis on fluid-structure interaction of an elastically mounted square cylinder at low Reynolds numbers

AIP Advances ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 115226 ◽  
Author(s):  
Xinru Mao ◽  
Li Zhang ◽  
Qunfeng Zou ◽  
Lin Ding
Keyword(s):  
Dynamic Analysis ◽  
Fluid Structure Interaction ◽  
Reynolds Numbers ◽  
Square Cylinder ◽  
Fluid Structure ◽  
Low Reynolds Numbers ◽  
Structure Interaction ◽  
Low Reynolds

Simulation of Fluid Flow Using Reduced-Order Modeling by POD Approach Applied to a Fixed Tube Bundle System

2010 ◽  
Author(s):  
Marie Pomarede ◽  
Erwan Liberge ◽  
Aziz Hamdouni ◽  
Elisabeth Longatte ◽  
Jean-Franc¸ois Sigrist
Keyword(s):  
Dynamic Analysis ◽  
Steam Generator ◽  
Tube Bundle ◽  
Fluid Structure Interaction ◽  
Reduced Model ◽  
Steam Generator Tube ◽  
Fluid Structure ◽  
Reduced Order ◽  
Structure Interaction ◽  
Tube Bundles

Tube bundles in steam boilers of nuclear power plants and nuclear on-board stokehold are known to be exposed to high levels of vibrations. This coupled fluid-structure problem is very complex to numerically set up, because of its three-dimensional characteristics and because of the large number of degrees of freedom involved. A complete numerical resolution of such a problem is currently not viable, all the more so as a precise understanding of this system behaviour needs a large amount of data, obtained by very expensive calculations. We propose here to apply the now classical reduced order method called Proper Orthogonal Decomposition to a case of 2D flow around a tube bundle. Such a case is simpler than a complete steam generator tube bundle; however, it allows observing the POD projection behaviour in order to project its application on a more realistic case. The choice of POD leads to reduced calculation times and could eventually allow parametrical investigations thanks to a low data quantity. But, it implies several challenges inherent to the fluid-structure characteristic of the problem. Previous works on the dynamic analysis of steam generator tube bundles already provided interesting results in the case of quiescent fluid [J.F. Sigrist, D. Broc; Dynamic Analysis of a Steam Generator Tube Bundle with Fluid-Structure Interaction; Pressure Vessel and Piping, July 27–31, 2008, Chicago]. Within the framework of the present study, the implementation of POD in academic cases (one-dimensional equations, 2D-single tube configuration) is presented. Then, firsts POD modes for a 2D tube bundle configuration is considered; the corresponding reduced model obtained thanks to a Galerkin projection on POD modes is finally presented. The fixed case is first studied; future work will concern the fluid-structure interaction problem. Present study recalls the efficiency of the reduced model to reproduce similar problems from a unique data set for various configurations as well as the efficiency of the reduction for simple cases. Results on the velocity flow-field obtained thanks to the reduced-order model computation are encouraging for future works of fluid-structure interaction and 3D cases.

scholarly journals Numerical investigation on the flow around a square cylinder with an upstream splitter plate at low Reynolds numbers

Meccanica ◽  
2020 ◽  
Vol 55 (5) ◽  
pp. 1037-1059
Author(s):  
Bo An ◽  
J. M. Bergadà ◽  
F. Mellibovsky ◽  
W. M. Sang ◽  
C. Xi
Keyword(s):  
Numerical Investigation ◽  
Reynolds Numbers ◽  
Splitter Plate ◽  
Square Cylinder ◽  
Low Reynolds Numbers ◽  
Low Reynolds
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