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Étude des sollicitations dynamiques induites par un fluide lourd au passage d'une singularité

Abstract : The flow of dense fluids within thin-walled piping systems may lead to significant levels of Flow-Induced Vibration, mainly in the vicinities of singularities such as obstacles inserted into the flow, sudden changes of cross-sectional area or flow direction. This study focuses on the analysis and reduced-order modelling of the vibrational source associated with the turbulent flow of liquids through a 90° elbow.A mixed experimental-computational approach is undertaken. A closed water loop containing a transparent elbow was designed in order to allow for fluid velocity measurements inside the singularity. To this purpose, planar and stereoscopic Particle Image Velocimetry (PIV) were employed. Wall pressure fluctuations and structural vibrations were measured simultaneously. Several flow configurations were tested in order to obtain a large coupled database linking the flow to the dynamic excitation, and then to the vibration response of the structure.In parallel, the unsteady water flow through the elbow was computed using Large-Eddy Simulation (LES). The fluid simulation allowed for a detailed study of the turbulent flow through the singularity and the unsteady pressure field induced on the piping walls. Finally, a set of statistical tools was applied to both experimental and computational data in order to propose a reduced-order model of the transfer function that links the tur-bulent flow to the dynamic excitation of the elbowed piping structure.
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https://tel.archives-ouvertes.fr/tel-02077349
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Submitted on : Friday, March 22, 2019 - 5:03:08 PM
Last modification on : Wednesday, October 14, 2020 - 4:11:04 AM
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  • HAL Id : tel-02077349, version 1

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André Baramili Fleury de Amorim. Étude des sollicitations dynamiques induites par un fluide lourd au passage d'une singularité. Mécanique des fluides [physics.class-ph]. Université de Poitiers, 2017. Français. ⟨NNT : 2017POIT2290⟩. ⟨tel-02077349⟩

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