An attempt to depict Fluidelastic Instability in a tube bundle by means of Proper Orthogonal Decomposition

9th Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise

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Title An attempt to depict Fluidelastic Instability in a tube bundle by means of Proper Orthogonal Decomposition
 
Creator Jerome CARDOLACCIA; Den-Service d'études mécaniques et thermiques (SEMT), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France
Franck BAJ; Den-Service d'études mécaniques et thermiques (SEMT), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France
 
Subject fluidelastic instability ; POD ; tube bundles
 
Description When it comes to fluid mechanics, Proper Orthogonal Decomposition has often been employed with the intention of building reduced ordered models. In this paper, we rather used POD as a data processing tool for its ability to exhibit "dominant features" of a dynamical system, namely here the vibration of the center tube in a 5x3 square array under cross-flow. Firstly, we conducted numerical simulations at various reduced velocities such that the fluid-structure coupled system was either stable or unstable. The Reynolds number spanned between 300 and 600 (based on gap velocity) so as to avoid unnecessary complexity due to turbulence, since we know that the Fluidelastic Instability can occur even in laminar state. Transpiration Boundary Conditions were applied in order to keep a fully Eulerian formulation, which makes the POD basis calculation much easier. Then, we computed the POD modes from simulations with or without structural motion and compared them from a physical point-of-view. More precisely, we expected that some of the modes display a peculiar behavior when passing across the Fluidelastic Instability.
 
Publisher Paper Management System for FIV2018
 
Contributor
 
Date 2018-05-04 16:26:29
 
Type Peer-reviewed Paper
numerical ; engineering analysis
 
Format application/pdf
 
Identifier http://www.fiv2018.com/ocs/index.php/fiv2018/fivcan/paper/view/50
 
Source Paper Management System for FIV2018; FIV2018 Conference
 
Language en
 
Relation http://www.fiv2018.com/ocs/index.php/fiv2018/fivcan/paper/download/50/175
 
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