25/02/2020

PhD in Fluids Mechanics

This job offer has expired


  • ORGANISATION/COMPANY
    CNRS UMR6614 CORIA
  • RESEARCH FIELD
    PhysicsComputational physics
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    01/06/2020 11:00 - Europe/Brussels
  • LOCATION
    France › Saint Etienne du Rouvray
  • TYPE OF CONTRACT
    Temporary
  • JOB STATUS
    Full-time
  • HOURS PER WEEK
    35
  • OFFER STARTING DATE
    05/10/2020
  • IS THE JOB RELATED TO STAFF POSITION WITHIN A RESEARCH INFRASTRUCTURE?
    Yes

Numerical modelling of aerated-water wave impact

1 PhD subject

1.1 Context and objectives

The PERCUSS project objective is to take into account accurately the effect of aeration on wave impact on offshores structures.

A number of energy systems are constrained by the impact load due to liquid-gas flows : coastal engineering, endurance of sea offshore structures, maritime transport of liquid fuels (LPG, methane...) through the sloshing process or the security of dams used for hydroelectric production.

This thesis has for main objective the development of dedicated model to take into account the influence of the aeration process.

For this purpose, different numerical approaches will be developed and compared with experimental results.

In order to perform this study, a collaboration between the CORIA laboratory (Rouen) and the LOMC laboratory (Le Havre) have emerged through the LABEX EMC3 PERCUSS project.

The CORIA laboratory is well known internationally for its expertise in combustion, turbulence, multiphase flows and optics.

Our group is within the multiphase flows department and composed of several PhD students and 3 permanents researchers (F.X. Demoulin, J. Reveillon, B. Duret) that will be happy to welcome you.

1.2 Scientific approach

This thesis will be focused first on understanding the aeration process through our academical in-house DNS code ARCHER. In that aim, a pertinent database of aerated liquid-gas flow on a wall will be build using ARCHER code and then used to develop a multi scale aeration model that will be implemented later in OpenFOAM for large scale simulation.

New impact laws and new models to take into account aeration will be proposed, based on phenomenological modelling such as the ELSA model (surface density) and innovative approaches such as deep learning techniques applied to DNS and experimental databases.

When an efficient modelling approach will be obtained, it will be integrated into OpenFOAM and used for large scale computations.

Experimental results will be obtained in the second thesis of this project, which is located at the LOMC laboratory (Le Havre). A strong interaction between both students is expected in this project.

Frequent meeting between Rouen and Le Havre will occur to better understand the effect of aeration in experiments and to help designing useful models that correspond to the behavior observed in the experiments results.

This work will be presented in international conferences (in multiphase flows and hydrodynamic community) and published in A rank journals.

1.3 Thesis planning

The first 6 months are dedicated to perform a bibliographic study on the subject and also to familiarize with the two-phase DNS code ARCHER.

The student will create a database of two-phase impact on a plate with different level of aeration. The configuration has already been developed and quasi-operational.

This will allows to unveil the different important physical parameters that need to be used in the modelling approach.

Then the modelling results will be compared againt the DNS database and the modelling approach will be improved if necessary.

When the model is validated against DNS data, the PhD student will discover the numerical tools used for large scale simulation (OpenFOAM®) and reproduce numerically the experiment of aerated liquid jet/wave impact done at LOMC (Le Havre).

During this period, occasional meeting between CORIA and LOMC will be planned: to confront the numerical results to the experiments, and to present the model and numerical methods that have been developed in OpenFOAM.

Finally, in the last part of the thesis the student has to finalize the different deliverables of the project and to finish the PhD manuscript.

1.4 Candidate profile

The applicant should justify a research cursus: Master degree (Bac+5) or Engineering school. His CV should show an academic or professional experience in the energetic domain, fluid mechanics and/or numerical simulation, applied mathematics, and also have programming skills. Experience on the OpenFOAM® software and/or deep learning techniques (neural networks) will be greatly appreciated.

The beginning of the thesis is planned in october 2020. But only the applications sent before the 1st of june 2020 will be considered due to administrative procedures.

 

Offer Requirements

Skills/Qualifications

The applicant should justify a research cursus: Master degree (Bac+5) or Engineering school. His CV should show an academic or professional experience in the energetic domain, fluid mechanics and/or numerical simulation, applied mathematics, and also have programming skills. Experience on the OpenFOAM® software and/or deep learning techniques (neural networks) will be greatly appreciated.

Map Information

Job Work Location Personal Assistance locations
Work location(s)
1 position(s) available at
CNRS UMR6614 CORIA
France
Saint Etienne du Rouvray
76800
Avenue de l'Université

EURAXESS offer ID: 497620

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