DEMPOWO FOUELEFACK, M. Paulin (2024) Studies of parasitic currents in the Front-Tracking method of TrioCFD code PFE - Project Graduation, ENSTA.
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Abstract
The issue of cooling the core of a nuclear reactor is important to ensure that it operates correctly. One way of doing this in fourth-generation sodium reactors is to use a cooling liquid in contact with a neutral gas sucked into the core through a pump. However, the vortices created by the suction can drain gas bubbles towards the pump and damage the pump. The criteria for entrainment remain poorly understood. Simulations are therefore needed to understand the phenomenon. Interface tracking methods for simulating two-phase fluids are a good way of accurately representing the interfaces between the phases involved, but present non-physical velocities at the interfaces known as parasitic currents. In this work, we will attempt to improve this method by studying two hydraulic systems at equilibrium : the glass of water at rest and the gravity-free bubble, using the \trio code developed at CEA since the 1990s. Our study includes a parametric analysis and a small disturbance analysis to determine the physical and numerical parameters on which the currents depend, the development of a new algorithm for calculating the discrete phase indicator based on the \medcoupling code developed between CEA and EDF since the 2000s, and then the establishment of a new discrete formulation enabling parasitic currents to be eliminated for interfaces with constant curvature.
Item Type: | Thesis (PFE - Project Graduation) |
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Uncontrolled Keywords: | Discretization methods, front-tracking, MEDCoupling, numerical simulation, parasitic currents, TrioCFD, one-fluid formulation. |
Subjects: | Information and Communication Sciences and Technologies Mathematics and Applications Fluid Mechanics and Energy |
ID Code: | 10199 |
Deposited By: | Paulin DEMPOWO FOUELEFACK |
Deposited On: | 16 sept. 2024 16:47 |
Dernière modification: | 16 sept. 2024 16:47 |
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