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Theses

Simulation numérique d'écoulements diphasiques avec ligne triple et changement de phase sur maillages non structurés

Abstract : This thesis aims at the numerical simulation of two-phase flows with contact linesand/or phase change by boiling on unstructured meshes. Indeed, the simulation ofcomplex physical phenomena, such as nucleate boiling, requires a methodology ableto handle wettability effects and mass transfer at the liquid-vapor interface. In thiscontext, a methodology devoted to the simulation of two-phase flows with contact linesin complex geometries is implemented in the finite volume library YALES2. Theinterface curvature at contact line is modified to impose the desired contact angle inorder to represent the wettability effects at the wall. In the framework of the level-setinterface capturing method, a new distance extrapolation process in the Blind Spot isdeveloped in order to improve the interface normal and curvature evaluation in the wallvicinity. The proposed methodology is validated against various cases as contactangle imposition, capillary rise and drop spreading. The detachment of a drop hangingon a horizontal fiber as well as the drop impact on a superhydrophobic cone are alsosimulated, showing a good agreement with experiments from the literature. Next, thephase change solver of YALES2 (dedicated to boiling simulation) is improved,especially thanks to a better viscosity treatment at the interface. This solver is thenused to simulate the rise and growth of a bubble in a superheated liquid. A goodagreement with experiments and simulations from the literature is observed. The filmboiling phenomenon is also simulated in two and three dimensions, revealing thesolver ability to handle interface topology changes. Finally, a first simulation ofnucleate boiling is performed. Although the accuracy and robustness of the methodstill need to be improved, this case opens up new prospects for the future. Forinstance, the numerical study of wettability effects on heat transfer by nucleate boilingcould be studied.
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https://tel.archives-ouvertes.fr/tel-03638270
Contributor : Abes Star :  Contact
Submitted on : Tuesday, April 12, 2022 - 10:33:46 AM
Last modification on : Wednesday, April 13, 2022 - 3:44:34 AM

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PERTANT_2022_archivage.pdf
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  • HAL Id : tel-03638270, version 1

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STAR | LEGI | CNRS | UGA

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Savinien Pertant. Simulation numérique d'écoulements diphasiques avec ligne triple et changement de phase sur maillages non structurés. Matériaux. Université Grenoble Alpes [2020-..], 2022. Français. ⟨NNT : 2022GRALI006⟩. ⟨tel-03638270⟩

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