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Theses

Etude 3D d’un tourbillon dans un champ de houle par holographie numérique

Abstract : This thesis deals with the use of digital in-line holography to the study of a vortex dynamics under water waves. As waves propagate above an immersed structure, vortices are formed at its edges. Those vortices have a strong impact on the flow dynamics in the vicinity of structures and can cause scouring or damages. Thus we are interested in the three-dimensional dynamics of those vortices which are quickly distorted, leading to their breakup. To study this dynamics, the physical problem is modelled by a basic geometry, a thin plate is set under monochromatic waves. Experiments are conduct within a wave flume of dimensions 10 m long and 30 cm width. To measure the 3D flow the use of an innovative technique, the digital holography which allow a 3D3C measure with only one camera and a laser diode. Its main limitations are the size of the cross-section of the sample volume and the number of particles allowed in it. However, digital holography can localize particles with a pixel sized resolution within the plans parallel to the CCD sensor and a depth resolution in the order of 3 to 5 times the particles diameter. Those measurements enable to follow the path of each particle inside the sample volume. Finally, acquisition by stereo particle image velocimetry confirms the velocities measured by holography and are used to study the interaction between the vortex and the combined action of free surface and the plate.
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https://tel.archives-ouvertes.fr/tel-01721560
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Submitted on : Friday, March 2, 2018 - 11:46:10 AM
Last modification on : Tuesday, February 5, 2019 - 11:41:21 AM
Long-term archiving on: : Thursday, May 31, 2018 - 4:03:15 PM

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  • HAL Id : tel-01721560, version 1

Citation

Benoît Lebon. Etude 3D d’un tourbillon dans un champ de houle par holographie numérique. Mécanique des fluides [physics.class-ph]. Normandie Université, 2017. Français. ⟨NNT : 2017NORMLH22⟩. ⟨tel-01721560⟩

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