slideshow 2 slideshow 3

You are here

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

Title: DEPHYMAN (Wave breaking: Physical, mathematical and numerical studies)

Duration: 18 months         Period:  01/07/2017 – 31/12/2018

Location: Marseilles, France

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

Summary:

This project is focused on studying depth-induced wave breaking in the coastal zone.
Wave breaking is an extremely nonlinear physical process: it is complex to understand and to
characterize physically, to model mathematically and to simulate numerically. Despite recent
advances with laboratory experiments and high resolution numerical simulations, the mechanics
and physics of wave breaking are still not fully mastered (initiation phase of breaking, transition
leading to the formation of a roller, vorticity intensity, turbulence and flow aeration, mechanisms
for generating vortex structures and dissipating wave energy, etc.). Progress in physical modeling
and numerical simulations is needed at two different levels: (1) in high-resolution models based on
two-phase (air-water) Navier-Stokes equations with appropriate consideration of turbulent effects,
allowing a fine resolution of the physical processes, but which can only be envisaged at a local scale
(i.e. one or a few waves), and (2) in more macroscopic (and therefore partially parameterized)
models inserted in codes simulating wave dynamics at the coastal scale. The latter models are
intended to represent some of the effects of wave breaking, in particular the impacts of the
dissipation of energy on the shape of waves and the decrease in wave height in the coastal zone.
This project aims to improve the physical knowledge, mathematical modeling and simulation tools
related to wave breaking. This will be possible with a unique combination of complementary
studies: small-scale laboratory experiments, mathematical modeling, and numerical simulations.
These approaches will allow advances at both a fundamental level (knowledge of the breaking
process) and for more applied projects, with the development and validation of wave breaking
models that can be implemented in wave propagation tools used in oceanography and coastal
engineering.

Job description

The DEPHYMAN project, based on the complementary skills of the project team
(i.e. experimental study and mathematical modeling of physical processes, advanced numerical
simulations) has two main objectives:
· Improvement of the knowledge of wave breaking processes, through original laboratory
experiments (work-package WP1) and high-resolution two-phase numerical simulations
(work-package WP2).
· Improvement of the modeling of wave breaking in numerical wave models simulating the
coastal zone, and analysis of these approaches compared to the laboratory experiments of WP1
and the detailed simulations of WP2. Wave breaking will be modeled using shocks in the Saint-
Venant equations (work-package WP3) and with the addition of complementary dissipative
terms in potential and Boussinesq-type wave models (work-package WP4).

The four work-packages are presented briefly in the figure provided in the attached file.

The post-doctoral candidate will contribute mainly to WP3 and WP4. Depending on the timing of
the project and the motivation of the candidate, he or she may also participate in the wave flume
experiments of WP1. In this respect, a profile covering "fluid mechanics for free-surface flows and
waves" and/or "coastal hydrodynamic" is particularly suited for the work to be carried out.

Essential skills:

Fluid mechanics of free-surface flows and waves; Wave physics and coastal waves;
Mathematical modeling and numerical simulation of waves and fluid flows; Numerical methods for
scientific computation.

Desired skills:

Coastal hydrodynamics; Laboratory experience; Data analysis and signal processing.

Contact:
Prof. Michel Benoit, Irphé and Ecole Centrale Marseille, Marseille, France
Mail : benoit@irphe.univ-mrs.fr Phone: + 33 4 13 55 21 16

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:

Prof. Michel Benoit, group leader of SAO team at Irphé (benoit@irphe.univ-mrs.fr)
Prof. Alain Pocheau, Labex MEC management (LabexConseilCoordination@irphe.univ-mrs.fr)

Deadline of applications: May 15th, 2017

**************************************************************

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)

**************************************************************

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)

**************************************************************

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)

English

Theme by Karine Boudoyan inspired by Danang Probo Sayekti