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Phd contract : MHeat transfer modelling of a rotating system based on a multi-physics model with immersed boundaries M/F

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : vendredi 3 février 2023

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General information

Reference : UPR3346-NADMAA-080
Nombre de Postes : 1
Workplace : FUTUROSCOPE
Date of publication : Friday, January 13, 2023
Scientific Responsible name : Monsieur Frédéric PLOURDE
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 March 2023
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

The CNRS, at the Pprime Institute, on the Futuroscope site, in the framework of a research project in collaboration with the DGAC (Direction Générale de l'Aviation Civile) is recruiting a PhD student who will carry out a thesis on the heat transfer modelling of a rotating system based on a multi-physics model with immersed boundaries.

This thesis will be realised within the framework of the development of new IBM models to take into account rotation mechanisms on liquid film behavior.

The need for cooling and thermal management of systems is increasingly important and can be coupled with lubrication issues (lubricating the mechanical parts in contact and in motion, and cooling the system). The physical fluid phenomena involved in lubrication are also equivalent: oil jet burst on gears or bearings, internal circulation of the two-phase air/oil mixture and ventilation of rotating parts.
However, the thermal problem is not very similar to the lubrication part: while a small quantity of oil is sufficient to form a film that ensures lubrication between moving mechanical parts, a much larger quantity is required to cool these components. The higher the speed, the more load-independent losses are the major power losses in the transmission. As these losses increase with the amount of lubricant used, the amount of lubricant must be finely tuned in order not to degrade the efficiency of the transmission. The thesis work aims at adapting the VOF models (several fluids) to the submerged boundaries to address several academic test cases. Based on the studies conducted on gear ventilation, at both experimental and numerical levels, the work will focus on the ventilation of air. In a transmission, a jet of oil will come on the gears in order to lubricate them and modify the power losses generated by the air mixing alone.

Work Context

The COST team works on the development of thermal system optimisations and modelling tools, with a strong expertise in immersed boundary modelling. These models open the door to fine multiphysics. Most of the models used by the COST team are "in-house" tools requiring a strong expertise in advanced modelling techniques.
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The PhD student will be based at the Pprime Institute in the Isae-Ensma building.

Constraints and risks

Short trips in France and abroad are to be expected.

Additional Information

The candidate must have an engineering degree and/or equivalent
The candidate must have a first successful experience in Immersed boundary method.
High level of English required (TOEIC higher than 900)
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The PhD student will be registered at the Isae-Ensma doctoral school.

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