Post-doctoral Position: Cfd Analysis of Flow

il y a 2 semaines

Marseille, France Institut de radioprotection et de sûreté nucléaire Temps plein

IRSN (Institut de Radioprotection et de Sûreté Nucléaire) is the french public expert in nuclear and radiation risks. Placed under the joint authority of the French Ministries of Defense, Environment, Industry, Research, and Health, it is the technical support organization of the French regulator for nuclear safety. For more information, see the website.

**Site web**:
**Poste et missions**:
**Context & Objectives**

During a hypothetical Loss of Coolant Accident, the fuel rods grouped into assemblies may balloon due to the high temperatures in the core and the differential pressure across the clad of the rods. Consequently, partial obstruction of the flow channel can jeopardize the cooling capability of the core during the following reflooding phase. During this phase, water is injected into the core leading to the progression of a quench front. Above this quench front, are located the ballooned hot rods exchanging heat with a steam-droplets flow. To study such configuration, IRSN has developed the DRACCAR software [1,2] allowing to simulate the thermal-mechanical behavior of a rod assembly during LOCA with a 3D multi-rod description. At the same time, simulations using the CFD code SATURNE-NEPTUNE have been carried out at a CFD scale to evaluate the wall heat transfer above the quench front [3,4,5]. Due to the lack of experimental data at such scale, tests were performed in the mock-up MASCARA using Reynolds analogy and MRI (magnetic resonance imaging) with the aims to get a fine mapping of the flow velocity [6].

The main objective of the proposed work is the development of adequate closure laws for the thermal-hydraulics of DRACCAR software through CFD simulations validated on MASCARA results.

**Mobilité géographique**:

- Pas de déplacement**Profil**:
Applicant should possess a Ph.D. degree in CFD and have a good knowledge of turbulence modelling, heat transfer processes and multiphase flow simulation. Knowledge of the C (or FORTRAN) programming language as well as the Unix environment will also be an asset.

**Objectifs**:
The study can be divided in the main following tasks:

- 1/ CFD Simulation of flow deviation with the SATURNE-NEPTUNE code_

CFD calculation of the flow deviation induced by different geometrical and flow-rate configurations will be compared to experimental results in order to better understand the flow just downstream deformed rods, where the deterioration of heat transfer may be critical. The calculations will be performed under adiabatic conditions.
- 2/ Upscaling model of flow deviation_

Cross-flows deduced from CFD in the region downstream deformed rods will be analyzed for prescribing a model for a sub-channel scale analysis in the DRACCAR code. The implementation of the model will be carried out with the help of the DRACCAR developing team located in the SEMIA department.
- 3/ CFD simulation of convective heat transfer_

Thermal heat transfer between rods and fluid will be studied in order to identify the hot spots within the geometry and to relate their position to the previous hydrodynamics study. The fluid considered will be steam taking into account its thermal expansion that may induce an additional phenomenology.
- 4/ Upscaling model of single-phase heat transfer_

Cross-flows and heat transfer intensity deduced from CFD in the region downstream deformed rods will be analyzed for prescribing models for a sub-channel scale analysis (see task n°2).
- 5/ Study of other geometries_

The hereinabove studies are limited to a set of configurations of an array of 4x4 rods deformed within a 7x7 rods array. The ability of modeling the phenomena on a more generic fuel assembly geometry is required to study core geometry. Based on the previous analyzes, recommendation for the design of new experiments or for the performance of additional computations will be made. This work will be performed in interaction with both the experimental IRSN department SEREX [7] at Cadarache and the LEMTA lab at Lorraine University [8] where the MASCARA experiments have been performed.
- 6/ Two-phase flow heat transfer_

In more realistic conditions, droplets flow within superheated steam act as an additional cooling source of the rods. Previous studies will be complemented by modeling their flow within the geometry based on a Euler-Euler two-phase model with heat and mass transfer thanks to the Neptune-CFD software.

**References**

[4] Guelfi, A., Bestion, D., Boucker, M., Boudier, P., Fillion, P., Grandotto, M., Hérard, J. M., Hervieu, É., Péturaud, P. “NEPTUNE: A new software platform for advanced nuclear thermal hydraulics.” Nucl Sci Eng. 2007;156:281-324.
[7] “IRSN SEREX and corresponding experimental research lab.”

  • Chercheur(Se) en Thermohydraulique, Mécanique Des

    il y a 1 mois

    Marseille, France IRSN Temps plein

    **Intitulé du poste**: Chercheur(se) en thermohydraulique, mécanique des fluides, thermique H/F **Type de contrat**: Post-doctorat **Statut**: Cadre **Disponibilité du poste**: 02/05/2023 **Localisation du poste**: Cadarache **Environnement / Organisation / Contexte**: During a hypothetical Loss of Coolant Accident, the fuel rods grouped into...

  • Support Engineer

    il y a 1 mois

    Marseille, France Manning Global Temps plein

    Our client, a leading global IT service provider, is recruiting a ** Support Engineer - Data Analysis ** to join their pro ject in ** France.** **Position Title**: **Support Engineer - Data Analysis** **Position Type**: - Employment**Start Date**: - ASAP**Location**: - Marseille - France**Contact**: - Davor Molnar | +49 (0) 89 23 88 98...

  • Phd Position in Medicinal Bioinorganic Chemistry:

    il y a 1 mois

    Marseille, France Institut des Sciences Moléculaires de Marseille UMR CNRS 7313 Aix-Marseille Université Temps plein

    **PhD position in medicinal bioinorganic chemistry: development of redox-active copper complexes for cancer therapy**: - Réf **ABG-122873** - Sujet de Thèse- 15/04/2024- Contrat doctoral- Institut des Sciences Moléculaires de Marseille UMR CNRS 7313 Aix-Marseille Université- Lieu de travail- Marseille - Provence-Alpes-Côte d'Azur - France- Intitulé du...

  • Flight Ops Data Management

    il y a 4 semaines

    Marseille, France CMA CGM Temps plein

    Since 1978 our Group has continued to provide end to end innovative and efficient solutions to customers, encompassing a complete range of shipping, land, air and logistics solutions. Today, we are reaffirming our values by continuing our growth through the newly created CMA CGM AIR CARGO division. This new activity enables us to offer a comprehensive...

  • The Transcriptional Control of Obesity Using

    il y a 2 jours

    Marseille, France Marseille Institute of Developmental Biology (IBDM) Temps plein

    **The transcriptional control of obesity using Drosophila as model**: - Réf **ABG-123953** - Sujet de Thèse- 17/05/2024- Financement public/privé- Marseille Institute of Developmental Biology (IBDM)- Lieu de travail- Marseille - Provence-Alpes-Côte d'Azur - France- Intitulé du sujet- The transcriptional control of obesity using Drosophila as model-...

  • Chercheur Post-doctoral

    il y a 4 semaines

    Marseille 5e, France CNRS Temps plein

    Date Limite Candidature : lundi 20 mars 2023 **Informations générales**: Référence : UMR7289-MAXCAZ-002 Nombre de Postes : 1 Lieu de travail : MARSEILLE 05 Date de publication : jeudi 23 février 2023 Type de contrat : CDD Scientifique Durée du contrat : 18 mois Date d'embauche prévue : 3 avril 2023 Quotité de travail : Temps complet Rémunération :...

  • Chargé D'étude en Incendie

    il y a 1 mois

    Marseille, France IRSN Temps plein

    **Intitulé du poste**: Chargé d'étude en incendie (logiciel CFD) H/F **Type de contrat**: CDI **Statut**: Cadre **Disponibilité du poste**: 01/02/2024 **Localisation du poste**: Cadarache **Environnement / Organisation / Contexte**: Vous intégrez le Laboratoire de l’Incendie et des Explosions (LIE) du Service des Agressions Internes et risques...

  • Online Football, Data analysis, Data tutor

    il y a 2 semaines

    Marseille, France TeacherOn.com Temps partiel

    I would like to know If you could help me for an analysis of a football dataLevel: Masters/Postgraduate Gender Preference: NoneMeeting options: Available online - via skype etc.

  • Postdoctoral Position

    il y a 1 mois

    Marseille, France Marseille Medical Genetics - Aix-Marseille Université Temps plein

    Our lab has a longstanding experience in addressing heart development and cardiac regeneration aiming to enhance these knowledges by using transgenic mouse models together with molecular, developmental, transcriptomic and imaging approaches. **Site web**: **Poste et missions**: ANR funded postdoctoral position to uncover the developmental origins of rare...

  • Evolution of Decision-making Neuronal Circuits in

    il y a 4 semaines

    Marseille, France Developmental Biology Institute of Marseille (IBDM) Temps plein

    **Evolution of decision-making neuronal circuits in the pest Drosophila suzukii**: - Réf - **ABG-115295** - Sujet de Thèse- 16/06/2023- Autre financement public- Developmental Biology Institute of Marseille (IBDM)- Lieu de travail- Marseille - Provence-Alpes-Côte d'Azur - France- Intitulé du sujet- Evolution of decision-making neuronal circuits in the...

  • Online Football, Data analysis, Data tutor

    il y a 2 semaines

    Marseille, Provence-Alpes-Côte d'Azur, France TeacherOn Temps plein

    I would like to know If you could help me for an analysis of a football dataLevel: Masters/PostgraduateGender Preference: NoneMeeting options:Available online - via skype etc.

  • Effets Thermiques Sur Le Transport Des Gaz Dans Les

    il y a 4 semaines

    Marseille, France Aix Marseille Université Temps plein

    **Effets thermiques sur le transport des gaz dans les membranes catalytiques // Thermal effects on gas transport in catalytic membranes**: - Réf - **ABG-119745** **ADUM-52886** - Sujet de Thèse- 27/01/2024- Autre financement public- Aix Marseille Université- Lieu de travail- MARSEILLE CEDEX 13 - France- Intitulé du sujet- Effets thermiques sur le...

  • Study of The Photochemical and Electron-beam

    il y a 4 semaines

    Marseille, France Isabelle Couturier Temps plein

    **Study of the photochemical and electron-beam evolution of Titan's atmospheric ices**: - Réf **ABG-121696** - Sujet de Thèse- 22/03/2024- Autre financement public- Isabelle Couturier- Lieu de travail- MARSEILLE - Provence-Alpes-Côte d'Azur - France- Intitulé du sujet- Study of the photochemical and electron-beam evolution of Titan's atmospheric ices-...

  • Head of Thematic Initiatives

    il y a 6 jours

    Marseille, France World Water Council - Conseil Mondial de l'Eau Temps plein

    **JOB OFFER - HEAD OF THEMATIC INITIATIVES** **Working time: 100%** **Venue: Headquarters of the World Water Council, Marseille, France Working languages: English and French** **Proven international experience.** Under the general supervision of the President, the Head of thematic initiatives will undertake the following tasks: **1.** **Thematic...

  • Business Developer

    il y a 1 mois

    Marseille, France Bourbon Temps plein

    A market leader in offshore marine services, BOURBON offers the most demanding offshore energy operators a broad range of surface and subsea marine services for oil & gas fields and wind farms. These services rely on a modern & standardized fleet of 248vessels and on the skills of more than 5,400 highly qualified professionals. Constantly striving for...

  • Research assistant position F/H

    il y a 1 mois

    Marseille, France Aix-Marseille Université Temps plein

    Mission Context This position is offered in the context of the AMIDEX chaire d’excellence . The project aims to characterize novel cancer surface markers and corresponding antibodies for the fluorescent and radio-imaging of tumors in vivo.EnvironmentThe successful applicant will work at the Cancer Research Center of Marseille () in the Glyntera team, led...

  • Vieillissement Des Macrophages Et Cancer

    il y a 4 semaines

    Marseille 9e, France Aix Marseille Université Temps plein

    **Vieillissement des macrophages et cancer // Tissue Macrophage Ageing and Cancer**: - Réf **ABG-121570** **ADUM-53649** - Sujet de Thèse- 22/03/2024- Contrat doctoral- Aix Marseille Université- Lieu de travail- MARSEILLE CEDEX 09 - France- Intitulé du sujet- Vieillissement des macrophages et cancer // Tissue Macrophage Ageing and Cancer- Mots clés-...

  • Efficient and Selective Oxidation of Methane Via

    il y a 1 semaine

    Marseille, France Institut des Sciences Moléculaires de Marseille (iSm2), équipe Chirosciences Temps plein

    **Efficient and Selective Oxidation of Methane via Caged Bioinspired Catalysts**: - Réf - **ABG-113407** - Sujet de Thèse- 14/04/2023- Autre financement public- Institut des Sciences Moléculaires de Marseille (iSm2), équipe Chirosciences- Lieu de travail- Marseille - Provence-Alpes-Côte d'Azur - France- Intitulé du sujet- Efficient and Selective...

  • Identification Et Caractérisation de Nouvelles

    il y a 4 semaines

    Marseille, France Aix Marseille Université Temps plein

    **Identification et caractérisation de nouvelles photoenzymes // Identification and characterization of novel photoenzymes**: - Réf **ABG-121613** **ADUM-54986** - Sujet de Thèse- 22/03/2024- Contrat doctoral- Aix Marseille Université- Lieu de travail- ST PAUL LES DURANCE CEDEX - France- Intitulé du sujet- Identification et caractérisation de...

  • Impact of Apoe4 On Synaptic Degeneration in

    il y a 4 semaines

    Marseille, France Institut de Neurophysiopathologie Temps plein

    **Impact of ApoE4 on synaptic degeneration in Alzheimer's disease**: - Réf - **ABG-111437** - Sujet de Thèse- 24/02/2023- Financement public/privé- Institut de Neurophysiopathologie- Lieu de travail- MARSEILLE - Provence-Alpes-Côte d'Azur - France- Intitulé du sujet- Impact of ApoE4 on synaptic degeneration in Alzheimer's disease- Champs scientifiques-...