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-24-0118
Thesis topic details
Category
Engineering science
Thesis topics
Toward robust simulations of uncertain industrial nonlinear dynamical systems
Contract
Thèse
Job description
Vibrations are encountered in many components of nuclear reactors subject to fluid flows (steam generator for example). Resulting impacts and friction contacts can lead to wear of the materials which must be controlled for improved maintenance and to guarantee the lifespan of these industrial components.
Thus, it is necessary to know the solicitation experienced by the structure, define a reliable modeling of the system and implement efficient and accurate numerical methods to obtain the non-linear dynamic responses of the system.
In order to improve the robustness and performance of the numerical methods currently used at Framatome, CEA and EDF, this phD thesis have the following objectives:
- implement an efficient temporal integration algorithm suited for the case of systems with contact and friction, in particular to accurately reproduce “stick-and-slip” regimes and then the wear power of the surfaces in contact.
- demonstrate the ability to simulate both a single tube and a bundle of nearly 5000 interacting tubes,
- study the applicability of fluid-elastic coupling models identified on a single straight tube to a bundle of multi-supported 3D tubes,
- identify the relative influence of physical and numerical parameters by probabilistic approaches.
A Master 2 internship is planned before the phD as an introduction to this work.
Profile required: Final year engineer or Master 2 equivalent. Specialized in mechanics, attracted by numerical methods (both computer development and practical use).
University / doctoral school
Ecole Doctorale de l’Institut Polytechnique de Paris (IP Paris)
ENSTA ParisTech
Thesis topic location
Site
Saclay
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
Prabel Benoit benoit.prabel@cea.fr
CEA
DES/DM2S/SEMT/DYN
CEA saclay
DEN/DM2S/SEMT/DYN
bat. 607
F91191 Gif sur Yvette cedex
FRANCE
Tutor / Responsible thesis director
Prabel Benoit benoit.prabel@cea.fr
CEA
DES/DM2S/SEMT/DYN
CEA saclay
DEN/DM2S/SEMT/DYN
bat. 607
F91191 Gif sur Yvette cedex
FRANCE
En savoir plus
https://cv.hal.science/benoit-prabel