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12 Mois

Instability development at the interface of viscous heterocharged fluids

The proposed studies will relate to a low Reynolds laminar flow of a two-dimensional mixture layer of a highly viscous dielectric fluid. The fluid / fluid interface will be studied experimentally under different conditions. This subject is part of action 5.1 of the INTERACTIVES labex, action which concerns the manipulation of internal flow by electrical discharge and charge injection.
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fixed term contract
3 ans

CLOSED-LOOP FLOW CONTROL BY PLASMA DISCHARGE AND MACHINE LEARNING

We propose to numerically derive closed-loop control strategies of different flows. We will treat the numerical simulation aspects of physical mechanisms (electrodynamics and fluid mechanics) and the development of innovative control strategies (Data Driven approaches based on machine learning methods). We will study two rather emblematic types of flows: - The flow behind an obstacle (cylinder, wing profile, backward facing step). This type of strongly separated flow is particularly interesting in cases where the objective of the control is to increase aircraft stealth.
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12 months

POST-DOC (M/F) - Control by Machine Learning of bluff body wakes

At the CNRS-Laboratory PPRIME, based at the Futuroscope, this post-doctorate position is part of the French ANR COWAVE program between the laboratories PRISME in Orleans, Pprime in Poitiers, LHEEA in Nantes and the PSA automotive industry. This Post-Doc position concerns the Pprime contribution to the COWAVE project which aims the experimental exploration of closed-loop wake control strategies with mobile flaps in a water tunnel facility. Three-dimensional bluff-body wakes generate pressure drag and side forces and thus contribute significantly to the fuel consumption and pollutant emission of road vehicles. Despite this crucial impact and the numerous attempts to reduce harmful environmental effect of bluff body wakes by flow control it is still unclear what is the most efficient control strategy! In this context, the ANR project COWAVE addresses two fundamental aspects of wake control: - First, what kind of actuators are most efficient? While most closed-loop control strategies use viscous entrainment effects to actuate the shear layers in the wake, the exploitation of pressure forces produced by mobile deflectors could be an interesting alternative to be tested. - Second, for the implementation of closed-loop control, we want to test if control strategies obtained by machine learning techniques allow to obtain better efficiency and robustness than the more classical model-based approaches? The proposed Post-Doc position is part of the French ANR COWAVE program between the laboratories PRISME in Orleans, Pprime in Poitiers, LHEEA in Nantes and the PSA automotive industry. This Post-Doc position concerns the Pprime contribution to the COWAVE project which aims the experimental exploration of closed-loop wake control strategies with mobile flaps in a water tunnel facility. APPLY Follow link / Application Deadline : 12 March 2021 https://bit.ly/3qDG6Ml
Internship
5 to 6 months

Master 2 internship -Filled- Multi-interstitials compounds: a new way in surface properties optimization of Titanium alloys

This position is filled. The proposed internship will focus on the determination of the diffusion parameters involved in the treatment of (pure) Titanium and the TA6V alloy. Oxi-nitriding treatments with gas enriched with 18O and 15N isotopes will be operated the plasma assisted thermochemical treatment reactor of the Physics and Mechanics Department (DPMM) of the P’ Institute. Various parameters will be investigated such as the microstructure of the modified surface, the crystallographic structure, the characterization of the isotopes profiles of the dedicated samples and the determination of the diffusion mechanisms. The applicant is expected to have motivation and skills in experimental characterization of materials and surfaces.
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12 Months

Expert in Scientific Computation

The postdoctoral intership is funded by the action 2 «Dynamique descontaminants» in the axis 3 «Chimie verte et préservation des ressources (eau,sol, biodiversité, carbone renouvelable)» of the ECONAT programme «gestiondurable des ECOsystèmes et des ressources NATurelles» (CPER 2015 – 2020). Oneobjective of the action 2 is to study the transport behavior of contaminants infractured limestone structures of the catchment area of Charente. In this action 2,we propose to develop numerical models, based on the Monte Carlo approach, forestimating the maximum dilution index Emax in heterogeneous porous andfractured media
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theses
36 months

PhD - Physical properties of functional thin films under mechanical stresses

The proposed thesis is part of an international collaborative research project (PRCI) of the ANR (French National Research Agency) and its Austrian alter ego the FWF (Fund zur Furderung der Wissenschaftlichen Forschung): NANOARCHITECTED FILMS FOR UNBREAKABLE FLEXIBLE ELECTRONICS (NANOFILM). The thesis aims to understand the relationship between the microstructure and the mechanical and electrical properties of nanostructured thin films using synchrotron radiation and X-ray diffraction supported by electrical characterization techniques such as Hall effect and Van der Pauw resistivity. The candidate will have the opportunity to participate in the design and production of a new biaxial traction machine of smaller dimensions than the one used in diffraction to visualize cracks under atomic force microscopy (AFM).
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36 mois (36 months)

PhD project : PolyAmide resistance to damage cumulation from high-pressure hydrogen cycling and fatigue loading

This PhD project, mainly experimental, focuses on PA11, a semi-crystalline thermoplastic used for the hoses of hydrogen refueling stations. The aim is to better understand the cross-dependence of two co-existing sources of damage (mechanical fatigue and repeated fast decompressions after exposure to high-pressure hydrogen) on micro-mechanisms and on their consequences on the residual mechanical properties and permeability. The PhD is part of an ANR (French National Research Agency) project. It will be prepared at Institut Pprime (Poitiers, France), in close collaboration with Hydrogenius laboratory (University of Kyushu, Japan), and will benefit from the feedback of Arkema (France and Japan) about industrial service conditions and specifications.
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theses
36 months

Surface hardening and fatigue behaviour of titanium alloys induced by multi-interstitial followed by mechanical surface treatments: effect of property gradient

The objective of our project is to open new routes to the improvement of the tribological properties of titanium alloys. To achieve this objective, a combination of thermochemical (multi-interstitial diffusion at moderate temperature) and mechanical (Surface Mechanical Attrition: SMAT) surface treatments will be considered. The underlying hypothesis of this research is that this combination will allow the formation of hard layers supported by a thick supporting layer with smooth mechanical property gradients together with the preservation of the macroscopic mechanical resistance of the alloys. Surface hardness will be used as an indicator for the treatment’s efficiency, and mechanical testing (including in situ tensile tests operated in SEM and fatigue testing) will be conducted to study the evolution of the damaging mechanisms of the material.
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