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Post-doctoral position

Applications Post-doctoral position

The Labex provides post-doctoral grants on subjects pointed out by participant teams according to their needs.

Gross salary are set by the IDEX A*MIDEX­:

Up to 3 years of professional experience after the PhD­:

  • Gross salary 2423 € / month
  • Net salary 1960€ / month (medical and social covers included)

Beyond 3 years of professional experience after the PhD­:

  • Gross salary 2843 € / month
  • Net salary 2300€ / month (medical and social covers included)

OFFERS

Research project and job description :

­Title: Inversion in nonlinear elastodynamics: application to the imaging of damaged media

Title: Interfaces in reactive flows

Title: Flows of gas mixtures in micro-nano porous media

Title: Transition of propagation regime of forest fires.

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Title: Inversion in nonlinear elastodynamics: application to the imaging of damaged media

Research project and job description

Title: Inversion in nonlinear elastodynamics: application to the imaging of damaged media

Summary:

The propagation of waves in damaged solids (concrete, rocks, etc.) involves nonlinear phenomena, even for very weak stresses [3]. These effects are manifested both by wave distortion, by the generation of harmonics, and by a variation in the propagation speed of waves at a long time scale. A thermodynamically admissible model has recently been proposed [2]. Numerical methods for simulating wave propagation in such media are being developed and are implemented in the PROSPERO propagation code (http://prospero-software.science).  . 

The proposed research project consists of studying the inverse problem of parameter identification: quantifying the nonlinear properties of the propagation medium from elastodynamic data measured at the boundary of the domain. To do this, Full Waveform Inversion is a widely used approach in the linear framework for seismic imaging and non-destructive testing [1,4] via the implementation of optimization methods. These approaches are based on the minimization of a cost function that quantifies the difference between real and simulated data. The extension of these algorithms to nonlinear behaviors raises questions about the computation of the gradient of the cost function, which is based classically on the construction of an adjoint state. This approach must be revisited in the case of nonlinear elastodynamics. The objective is to extend these methods to the propagation of nonlinear elastic waves, drawing on the work done in fluid mechanics, notably on the Navier-Stokes equation.

[1] C. Bellis, S. Imperiale, “Reciprocity identities for quasi-static piezoelectric transducer models: Application to cavity identification using iterated excitations and a topological sensitivity approach”, Wave Motion 51-1 (2014), 125-145.

[2] H. Berjamin, N. Favrie, B. Lombard, G. Chiavassa, “Nonlinear waves in solids with slow dynamics: an internal variable model”, Proceedings Royal Society London A 473 (2017) 20170024.

[3] R.A. Guyer, P.A. Johnson, “Nonlinear mesoscopic elasticity: Evidence for a new class of materials”, Phys. Today 52 (1999), 30-36.

[4J. Tromp, C. Tape, Q. Liu, “Seismic tomography, adjoint methods, time reversal and banana-doughnut kernels, Geophys. J. Int. 160 (2005), 195-216.

Job description:

The work will address the theoretical and numerical aspects of the problem (implementation in PROSPERO). The work will take place at the Laboratory of Mechanics and Acoustics (LMA) and will be supervised by

Cédric Bellis: 33-(0)4-84-52-56-30 ; bellis@lma.cnrs-mrs.fr 

Bruno Lombard  ; lombard@lma.cnrs-mrs.fr ; 33-(0)4-84-52-42-53 ;

Guillaume Chiavassa ; 33-(04-91-05-46-69 ; guillaume.chiavassa@centrale-marseille.fr

Essential skills:

The fields of expertise of the candidate should include applied mathematics. The doctoral thesis must have been supported before the start of the contract.

Desired skills:

Skills in theoretical mechanics would be appreciated. Research interests of the candidate must be oriented towards the described applications (seismology, nondestructive evaluation)

Labex team Axe, action, volet : axe 2, actions 2-1, 2-2 et 2-3

Contact : Sergey Gavrilyuk

Mail : sergey.gavrilyuk@univ-amu.fr

How to apply

Send an application including:

  • A detailed CV with a list of publications
  • A cover letter
  • A list of scientific personalities able to comment on the application

to both these addresses:

Relevant group leader (lombard@lma.cnrs-mrs.fr)

Labex management (LabexConseilCoordination@irphe.univ-mrs.fr)

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Title: Interfaces in reactive flows

Duration: 1 year Period: start asap, between March and September 2018

Location: Marseille, France Gross salary: from 2423 € to 2843 €/month, depending on qualification and experience

Research project and job description

Title: Interfaces in reactive flows

Summary:

This project aims at developing a unified modelling method for flows that are both multiphase and reactive. Such complex flows are present in many applications. In cryogenic rocket engines, for instance, liquid oxygen is injected straight into the combustion chamber. The liquid jet is consequently strongly destabilised and atomised, before evaporating and burning with the surrounding hydrogen. Today, the processes corresponding to the liquid jet destabilization and to the combustion are tackled separately, without an appropriate coupling: no flow model has the capability of modelling both the multiphase and reactive aspects, whilst admittedly strongly coupled.
The objective is to develop a new model, allowing an accurate simultaneous representation of interfaces, phase transfer and combustion. For this, previous works [references available on request] will be extended as to encompass reactive flows. Validation will then be carried out on both multiphase and reactive academic test cases.

Job description:

The work will be carried at M2P2 (Pierre Boivin), in close collaboration with IUSTI (Jacques Massoni and Olivier Le Métayer). The two labs are within 5min walking and belong to the Fabri de Peiresc Federation.

Essential skills:

Strong background in scientific computing (Fortran preferred), reactive and/or multiphase flows.

Proficiency in scientific writing.

Desired skills:

hyperbolic methods, HPC

Labex team

Pierre Boivin, Jacques Massoni, Olivier Le Métayer.


Axis 2 action 3 : Hétérogénéité, Multi-échelles, Changement d'échelles, Modélisation des milieux hétérogènes, ondes, interfaces et couplages multi-physiques

Contact: Pierre Boivin

Mail: pierre.boivin@univ-amu.fr Phone: +33(0)4 91 05 46 37

How to apply

Send an application including:

  • A detailed CV with a list of publications
  • A cover letter
  • A list of scientific personalities able to comment on the application

to both these addresses:

Relevant group leader (pierre.boivin@univ-amu.fr)

Labex management (LabexConseilCoordination@irphe.univ-mrs.fr)

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Title: Flows of gas mixtures in micro-nano porous media

Duration: 1 year    Period: 01.05.2018 - 30.04.2019

Location: Marseille, France Gross salary: from 2423 € to 2843 €/month, depending on qualification and experience

Research project and job description

Title: Flows of gas mixtures in micro-nano porous media

Summary:

The objective of this post doctorate is to broaden the research theme recently started. This topic concerns the experimental study of the flow of gaseous mixtures in micro-nano porous systems. First step is the development of an experimental methodology for characterizing the flow of gas mixtures through such a system and then the experimental study of these flows on a large variability of operating parameters. In a second step, is the development of the mathematical models for the simulations of the gas mixtures flows at micro scales. These models will be based on the real geometry resulting from tomography of micro and nanoporous media.

Job description:

Candidates must have a Ph.D. preferably in Fluid Mechanics, Process Engineering, Physics or Analytical Chemistry, and must also have a record of publications relevant to their research experience.
Previous experience with gaseous mass spectrometer analyzes, including experience with experimental methods in vacuum technology, would be an asset. Prior experience in microfluidics, especially in flow dynamics, could be a plus for the project.
Candidates should be able to write scientific activities and reports in both French and English.

Essential skills:

Mastery of Labview, Matlab, Mass Spectrometry, Vacuum Technique

Desired skills:

Flow experience in porous media. Experience in a diluted medium

Labex team

Axis, action, part : Fluide complexe, Procédés membranaires et nanofluides, «Comportement des fluides dans les micro-systèmes»


Contact: Name, surname: Graur Martin Irina
Mail: irina.martin@univ-amu.fr Phone: +33(0)6 33 23 69 00

How to apply

Send an application including:

  • A detailed CV with a list of publications
  • A cover letter
  • A list of scientific personalities able to comment on the application

to both these addresses:

Relevant group leader (irina.martin@univ-amu.fr)

Labex management (LabexConseilCoordination@irphe.univ-mrs.fr)

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Title: Transition of propagation regime of forest fires.

Duration: 1 year    Period: start asap, between March and September 2018

Location: Marseille, France

Gross salary: from 2423 € to 2843 €/month, depending on qualification and experience

Research project and job description

Title: Transition of propagation regime of forest fires.

Summary:

This project aims at investigating the transition from plume dominated to wind driven fires. This transition has been characterized in the past based on two dimensional considerations. It is commonly associated with a stiff transition of the convective and radiative heat fluxes ahead of the fire front.

Using multiphase three dimensional simulations on an equivalent static fire configuration, the objective of this work is to better characterize the transition and it's effect on the convective and radiative heat transfers. Finally, these simulations will be used to draw a map of the dimensionless configuration space {Byram ; CdLAI}. The simulations will be conducted using the solver ForestFireFOAM, an extension of FireFOAM developped at M2P2 to study forest fire propagation.

Job description:

The work will be carried at M2P2 with Aymeric Lamorlette, within the TONIC team.

Essential skills:

Strong background in scientific computing (C++, specific OpenFOAM object preferred), multiphase flows.
Proficiency in scientific writing.

Desired skills:

FireFOAM, flow-vegetation interaction, combustion

Labex team

Aymeric Lamorlette
Contact: Aymeric Lamorlette
Mail: aymeric.lamorlette@univ-amu.fr Phone: +33(0)4 91 11 85 24

How to apply

Send an application including:

  • A detailed CV with a list of publications
  • A cover letter
  • A list of scientific personalities able to comment on the application

to both these addresses:

Relevant group leader (aymeric.lamorlette@univ-amu.fr)

Labex management (LabexConseilCoordination@irphe.univ-mrs.fr)

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