General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DES-26-0146
Thesis topic details
Category
Engineering science
Thesis topics
HPC two-phase simulations with lattice Boltzmann methods and adaptative mesh refinement
Contract
Thèse
Job description
CEA/STMF develops computational fluid dynamics (CFD) codes in thermohydraulics that aim to quantify mass and energy transfers in nuclear cycle systems such as reactors and management devices of radioactive wastes. This thesis focuses on Lattice Boltzmann Methods (LBM) adapted to Adaptive Mesh Refinement (AMR) inside a generic computing environment based on Kokkos and executable on multi-GPU supercomputers. The proposed work consists in developing LB methods in the Kalypsso-lbm code to simulate coupled partial differential equations (PDEs) modelling incompressible two-phase and multi-component flows such as those encountered in downstream cycle devices. Once the developments have been completed, they will be validated with reference solutions. They will allow a comparison of various interpolation methods between blocks of different sizes in the AMR mesh. A discussion will be held on the refinement and de-refinement criteria that will be generalized for these new PDEs. Finally, benchamrks of performance will quantify the contribution of AMR for 3D simulations when the reference simulation is performed on a static and uniform mesh. This work will use supercomputers which are already operational (e.g., Topaze-A100 from CEA-CCRT), as well as the future exascale supercomputer Alice Recoque depending on the progress of its installation.
University / doctoral school
Sciences Mécaniques et Energétiques, Matériaux et Géosciences (SMEMaG)
Paris-Saclay
Thesis topic location
Site
Saclay
Requester
Position start date
01/10/2026
Person to be contacted by the applicant
CARTALADE Alain
alain.cartalade@cea.fr
CEA
DES/DM2S/STMF/LMSF
CEA/Saclay
Bât 451 p 5
01 69 08 40 67
Tutor / Responsible thesis director
CARTALADE Alain
alain.cartalade@cea.fr
CEA
DES/DM2S/STMF/LMSF
CEA/Saclay
Bât 451 p 5
01 69 08 40 67
En savoir plus