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Portail > Offres > Offre UPR3346-NADMAA-054 - CDD CHERCHEUR-Postdoc sur les méthodes de suivi Lagrangienne (F/H) (H/F)

(F/M) RESEARCHER-PhD in Development of Lagrangian tracking techniques (LPT)

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

Date Limite Candidature : lundi 13 décembre 2021

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General information

Reference : UPR3346-NADMAA-054
Date of publication : Monday, November 22, 2021
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 January 2022
Proportion of work : Full time
Remuneration : Between 2663 € et 3069 € grossmonthly according to experience
Desired level of education : PhD
Experience required : 1 to 4 years


Le CNRS, au sein de l'institut Pprime basé au Futuroscope, recrute un Chercheur qui travaillera sur un nouveau prototype de filtre gravitaire innovant dans le cadre d'un contrat Européen Grinfil.
The CNRS, within the Pprime institute, based at the Futuroscope, this post-doctorate position is working on a new prototype of innovative gravity filter, as part of a European Grinfil contract.
The agent's main mission will be to develop and finalize a Lagrangian tracking technique to measure the velocities of particles or bubbles. This volumetric technique based on laser or diode volume illumination and several cameras will allow with a good resolution to follow the trajectories.
The objective of the work that the candidate will have to provide is to reconstruct a three-dimensional displacement field of particles from images of these particles at short time intervals and in different directions (typically 3). The concentration of particles will be as high as possible.
For this, the candidate will rely on existing camera calibration and triangulation libraries, developed in C++. He will have to develop a particle matching algorithm on several successive instants in order to obtain particle trajectories. The main difficulty lies in the fact that particle localization errors are amplified during the matching process, leading to the appearance of "false" particles and the disappearance of "true" particles. This is all the more true when the particle concentration is high. The candidate will therefore have to introduce regularization constraints on the displacements to reduce the uncertainties on the location of the particles and allow the verification of the continuity equation. He will also have to take into account the particles that enter or leave the measurement volume. The developed algorithms will be validated on synthetic data and applied to experimental data already obtained elsewhere. A comparison can be made with a commercial software.


The candidate will be expected to perform the following activities
- Developing a Lagrangian tracking technique with existing tools and libraries in the team
- Validating the algorithms on synthetic data
- Applying the method to two-phase measurements in the pilot developed for the project
- Working in close collaboration with the scientific leader of the project
- Validating the work in conferences and scientific journals


The candidate should have strong skills in :
- applied mathematics
- fluid mechanics
- object-oriented programming, preferably in C++, optimization and image processing.

The candidate will be expected to possess the following skills:
- Written and oral presentation skills
- English language: B1 to B2 (Common European Framework of Reference for Languages)
- Respect the conditions of use of experimental devices
- Lead a meeting
- Apply the rules of hygiene and safety
- Work in a team
- Sense of initiative
- Critical thinking
- Sense of organization

Work Context

The CNRS (Centre national de la recherche scientifique) is a public multidisciplinary research organization under the supervision of the Ministry of Higher Education, Research and Innovation, which aims to advance knowledge for the benefit of society.
The Pprime Institute is a UPR (Unité Propre de Recherche) of the CNRS in the fields of Physical Sciences and Engineering Sciences. Its activities cover a wide scientific spectrum, from the physics of materials to fluid mechanics, solids, mechanical engineering and energy.
The HYDEE team develops research activities within the DFTC department in the field of hydrodynamics and sedimentary transport of complex fluids. In this project, in collaboration with the company Aqseptence, we are setting up an experimental prototype of a gravity filter that will allow the validation of numerical simulations. The final objective is to develop a new product. For this, the Lagrangian method developed will help us to analyze the experimental results.

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