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Etude numérique de la dynamique de poches de cavitation sur une configuration de type Venturi

Abstract : The present PhD thesis aims at studying sheet cavitation dynamics by carrying out numerical simulations. This phenomenon appears in many hydraulic applications and can lead to technical issues, such as material degradations, performance reduction or noise generation. Some significant outcomes, such as the complex topology of three-dimensional cavitation pockets and their associated dynamics, need to be carefully visited. Therefore, the dynamics of partial cavitation developing in a 3-D Venturi geometry and the interaction with sidewalls are numerically investigated. In the first instance, software validation is proposed on non-cavitating and cavitating cases. Then, simulations are performed using a one-fluid compressible Reynolds-Averaged Navier–Stokes (RANS) solver associated with a non-linear turbulence model and a void ratio transport-equation model. A detailed analysis of this cavitating flow is carried out using innovative tools such as Spectral Proper Orthogonal Decompositions (SPOD). Particular attention is paid to the study of 3-D effects by comparing numerical results obtained with sidewalls and periodic conditions. A three-dimensional dynamics of the sheet cavitation, unrelated to the presence of sidewalls, is identified. The link between the mechanisms involved in sheet cavitation, such as the re-entrant jet and the vapour pocket behaviour, is discussed. The effects of the cavity dynamics on the flow are also identified.Thereafter, a range of Hybrid RANS/LES methods is investigated on a non-cavitating case with a similar configuration to the cavitating Venturi flow one. This study intends to select an acceptable hybrid RANS/LES method for sheet cavitation simulation using a better-resolved approach.
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Submitted on : Friday, April 22, 2022 - 11:06:10 AM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM
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  • HAL Id : tel-03649094, version 1

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Camille Gouin. Etude numérique de la dynamique de poches de cavitation sur une configuration de type Venturi. Mécanique des matériaux [physics.class-ph]. HESAM Université, 2021. Français. ⟨NNT : 2021HESAE075⟩. ⟨tel-03649094⟩

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