Internship - Numerical Study of Turbulent Flows in

Description du poste

**Domaine**:

- Thermohydraulique et mécanique des fluides

**Contrat**:

- Stage

**Intitulé de l'offre**:

- Internship - Numerical study of turbulent flows in the bottom of fuel assemblies H/F

**Sujet de stage**:

- Fuel assemblies are key components of reactor cores. They are made up of small-diameter tubes between which a highly turbulent flow circulates. These rods are held together by grids, and other geometric features may also be found at the bottom of the assembly. Amplified by these features, turbulent structures induce vibrations that can lead to fretting wear damages.
The topic of this internship is to study numerically the effect of the different geometrical features on turbulent flow quantities in order to understand their role in flow induced vibrations.

**Durée du contrat (en mois)**:

- 6

**Description de l'offre**:

- It could include the following activities (non-exhaustive list):
- Brief literature review on turbulent flows in core fuel sub-assemblies
- Data set configuration for Computational Fluid Dynamics (CFD) calculations (CAD, Meshing, solver settings)
- Analysis of computation results

You will be mostly in charge of CFD numerical studies. You will need understanding of fundamentals of fluid mechanics (turbulent flows) and numerical methods (finite differences, Fourier transform ). It is important you are also fluent in English since most of relevant literature on the topic is in English. You don't need to have a previous experience or knowledge of turbulent flow in reactor cores.**Moyens / Méthodes / Logiciels**:

- TrioCFD / Code SATURNE / SALOME / Paraview / Python
- You are preparing an engineering degree (MSc level) or equivalent, with major in fluid dynamics.
Required skills & knowledge: CFD, turbulence modelling, meshing, numerical methods.-
In accordance with CEA commitment to the integration of people with disabilities, this job position is open to everyone. The CEA offers accommodation and/or organisational possibilities.Localisation du poste

**Site**:

- Cadarache

**Localisation du poste**:

- France, Provence-Côte d'Azur, Bouches du Rhône (13)

**Ville**:

- Saint-Paul-lez-Durance

**Langues**:

- Anglais (Courant)
- Français (Courant)

**Diplôme préparé**:

- Bac+5 - Diplôme École d'ingénieurs

**Formation recommandée**:

- MSc with major in fluid dynamics

**Possibilité de poursuite en thèse**:

- Non

Demandeur

**Disponibilité du poste**:

- 01/02/2024

Informations générales

**Entité de rattachement**:
Le CEA est un acteur majeur de la recherche, au service des citoyens, de l'économie et de l'Etat.

Il apporte des solutions concrètes à leurs besoins dans quatre domaines principaux : transition énergétique, transition numérique, technologies pour la médecine du futur, défense et sécurité sur un socle de recherche fondamentale. Le CEA s'engage depuis plus de 75 ans au service de la souveraineté scientifique, technologique et industrielle de la France et de l'Europe pour un présent et un avenir mieux maîtrisés et plus sûrs.

Implanté au cœur des territoires équipés de très grandes infrastructures de recherche, le CEA dispose d'un large éventail de partenaires académiques et industriels en France, en Europe et à l'international.

Les 20 000 collaboratrices et collaborateurs du CEA partagent trois valeurs fondamentales:

- La conscience des responsabilités
- La coopération
- La curiosité

**Référence **:2024-32768**Description de l'unité**:

- The Research Institute for Nuclear Systems for a Low Carbon Energy Production (IRESNE) is one of three institutes forming the Energies Division of the CEA (French Alternative Energies and Atomic Energy Commission). IRESNE leads studies on low carbon energy production systems using or adding value to energy from nuclear technology sources. It also provides support for experimental reactors and nuclear propulsion systems design.
Within IRESNE and its Section of Industrial Components and Processes (STCP, part of the Department of Nuclear Technology), the Laboratory of Hydro-mechanical Experiments and studies (LETH) carries out research and development activities (both experimental, numerical and analytical) to improve knowledge of hydro-mechanical and thermal-hydraulic behaviour of components from reactor cores and their cooling circuits, under nominal and accidental conditions.