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Offres de Thèses et Postdocs


  • 01 SEP 31 AUG
    Dans le contexte de changement climatique, il est parfois difficile de distinguer les influences anthropiques, de la variabilité naturelle, tant celle-ci est complexe et pourtant si importante qu’elle peut masquer les effets des activités humaines sur le climat. C’est notamment le cas pour la variabilité de la circulation atmosphérique, que les modèles numériques actuels ne reproduisent pas correctement. L’une des raisons est l’impossibilité pour ces modèles de simuler les processus physiques sur l’ensemble des échelles spatio-temporelles où elles se produisent et notamment comment différents processus à différentes échelles interagissent. Le but de la thèse est de comprendre le lien entre les grandes échelles spatio-temporelles des mouvements cohérents de l’atmosphère et les statistiques à l'échelle régionale des différents champs turbulents (vitesse, température, humidité, précipitations), et notamment les événements rares ou extrêmes.
  • 01 SEP 01 SEP
    TWe are currently offering two PhD positions: Experimental measuremenst of multiphase flows and numerical simulations of multiphase flows.The official advertisement will be opened soon, but inquiries can be sent to Mrs. Müllner at christina.muellner@tuwien.ac.at
  • 01 OCT 30 SEP
    The objective of this postdoc is to study the importance of the fluid miscibility on the RTI dynamics using highly resolved simulations with the pseudo-spectral code STRATOSPEC . A diffuse interface method relying on the Cahn-Hilliart equations will be coupled to the Navier-Stokes solver. To this aim, we propose to assess the efficiency of various semi- or fully implicit numerical methods. Computational resources for the simulations will be provided through the TGCC supercomputers. Different theories and models will be proposed to interpret the results.
  • 01 NOV 01 NOV
    Turbulence et circulations à résolution décamétrique dans les nuages convectifsDans le cadre de cette thèse, nous souhaitons étudier les processus physiques à l’interface nuageuse à l'aide de simulations à très fine résolution (LES décamétrique) avec le modèle Méso-NH (Lac et al, 2018). L'objectif est de caractériser les circulations au sein des nuages convectifs (du cumulus au cumulonimbus), ainsi que les structures turbulentes associées.
  • 01 NOV 31 OCT
    A goal of this research project is to propose solutions to improve the performance of heat exchang-ers by using acombination of active control strategiestomaximise heat-transfer capacityalong the interface fluid/structureandminimise the pressure loss due to friction betweenthe fluid and the wall.
  • 01 NOV 01 NOV
    The aim of the PhD project is to understand the dynamics of jets hitting a surface, using a combination of experimental, numerical and theoretical approaches.
  • 01 NOV 30 OCT
    The Fluid Mechanics Laboratory of Lille (CNRS-LMFL) is seeking a highly qualified candidate for a post-doctoral research fellowship to participate in ERC Advanced Grant research project NoStaHo which is aimed at an extensively transformative fundamental understanding and theory of non-stationary and/or non-homogeneous turbulence.The candidat will participate in the experimental side of the project by contributing to (i) Particle Image velocimetry and Hot Wire Anemometry measurements and (ii) various ways to analyse the data obtained for a variety of turbulent flows including various types of turbulent wakes, jets and boundary layers.
  • 01 JAN 31 AUG
    The work of the candidate will aim for the development of the following tasks:1. Implementation of data streaming machine learning techniques within the C++ software developed by the research group, aiming to reconstruct an augmented IBM formalism. The AI learning procedure will be fed by online data generated by the MGEnKF.2. The performance of the code will be assessed via the analysis of progressively more complex scale-resolved turbulent flows. The test cases investigated include the turbulent channel flow and, in case of success, complex test cases such as a radial pump will be investigated. For every test case considered, high fidelity DNS / experimental data are already available from previous analyses of the research group.
  • 01 NOV 01 OCT
    We have a number of post-doctoral and doctoral positions on ocean modeling to fill in our Odyssey team at Inria (Rennes, France).
  • 01 DEC 01 DEC
    L'ébullition est un phénomène complexe impliquant à la fois une dynamique complexe et des effets thermiques forts. Une bonne compréhension des différents régimes d'écoulement (bulle, poche, annulaire) est nécessaire pour modéliser correctement ce phénomène dans le cadre d'étude de conception ou de sûreté industrielle. L'objectif de la thèse est d'identifier les conditions d'écoulement amenant un essaim homogène de bulles à se déstabiliser. Il convient de caractériser ce type de transition pour mieux comprendre des effets d'accumulation locale de bulles pouvant amener à de la coalescence, par exemple. Cette étude se fera via des simulations numériques directes et une méthode de capture d'interface Front-Tracking permettant le suivi lagrangien des bulles.
  • 01 JAN 01 JAN
    L’objectif de ce postdoc est de caractériser théoriquement et numériquement le couplage d’écoulements de sillages turbulents pour plusieurs corps présentant différentes géométries. Les approches seront multiples et permettront de comparer les modèles développés récemment avec des modèles classiques et des simulations numériques directes. Des comparaisons expérimentales seront réalisées dans le cadre du projet SILTURB à l’aide d‘expériences dédiées réalisées à l’UME de l’ENSTA. Les résultats de ces études ont pour objectif de proposer des modèles de fermeture nouveaux implémentables dans les codes CFD
  • 01 FEB 01 FEB
    The mechanical engineering department of the LISN lab invites applications for a one-yearpostdoctorate position to conduct cutting-edge research at the intersection of turbulent naturalconvection, convolutional neural networks (CNN), physics-informed machine learning, and high-performance computing (HPC). The successful candidate will work on advancing the field of super-resolution analysis for turbulent fluid flows using innovative approaches based on numerical andexperimental ombroscopy techniques.
  • 01 FEB 01 APR
    We have developed an airborne platform called the Max Planck CloudKite (MPCK). It has been deployed over the Atlantic Ocean during the EUREC4A research cruise and in northern Finland inside the Arctic Circle. Our instruments perform autonomous measurements in the atmosphere, including particle image velocimetry and holography. In the next phase of our investigations, we will simultaneously measure with high resolution aerosols, wind speed and atmospheric thermodynamics as a function of altitude. These measurements will be complemented by most advanced microphysical cloud measurements. In collaboration with our colleagues at the Fraunhofer Institute for Integrated Circuits IIS, we are developing SMART Integrated Electronic Sensors (SMARTIES) to quantify atmospheric transport and mixing through many neutrally buoyant and biocompatible floaters.
  • 01 FEB 01 FEB
    This postdoc position consists on an experimental study of highly unsteady and inhomogeneous particle-laden flows, a problem at the heart of virus transmission and climate change predictions. For such aim, we propose a series of innovative experiments on the gravitational settling and spatial segregation of particles carried by unsteady and inhomogeneous turbulent flows. The project will provide a description of the pulsed jet (on single and multi-phase conditions), including realistic situations such as laryngeal-like jets and time-dependent particle inertia caused by phase transitions. The proposed experiments start from canonical conditions but progressively increase in complexity in a controlled way.
  • 01 MAY 01 MAY
    The Department of Engineering at Reykjavik University is looking for a PhD student to work on the project “Wind Power Installations in Harsh Environments; an experimental study”.
  • 01 MAY 01 NOV
    L’originalité de ce travail consiste à passer de l’échelle laboratoire où différentsessais ont été menés pour caractériser l’érosion à une grande échelle sur laquelledifférentes études de terrain sont menées dans le cas de la thèse en cours surl’étude du transport sédimentaire en milieu instationnaire. L’objectif du postdoctorant sera de paramétrer les lois d’érosion et de transport en reproduisant lesexpériences laboratoire par des simulations numériques pour pouvoir ensuitealimenter des simulations numériques à plus grande échelle, réalisées avecTélémac.
  • 01 JUN 01 DEC
    L’étude proposée ici repose sur la comparaison de modèles numériques dédiées au transport sédimentaire pour identifier des modèles physiques locaux de transport sédimentaire. L’objectif est de comparer les résultats issus de simulations numériques sous OpenFoam à des mesures obtenues en laboratoire de transport sédimentaire à des échelles locales en temps et en espace. Ces mesures expérimentales ont été réalisées en configurations stationnaire et instationnaire pour différentes caractéristiques de sédiments. Des mesures de la réponse du lit sédimentaire, du taux d’érosion et des conditions hydrodynamiques (vitesses et hauteurs) ont été acquises et sont disponibles à partir des travaux de thèsefinancés par l’OFB et démarrés en Octobre 2022.
  • 01 JUL 30 JUN
    This postdoctorate investigates the question of the influence of large structures on small scales and their fluctuations and vice versa in atmospherics dynamics.In particular, this postdoctorate will consist especially in performing Direct Numerical Simulations (DNS) of an idealized geophysical flow in the strongly stratified turbulence (SST) regime (i.e. small Froude number and high buoyancy Reynolds number) containing large structures called vertically-sheared horizontal flow, internal gravity waves and eddies. In addition, he will have to apply a new method for extracting large strutures, waves and vortices, developed in our team (Lam et.al. atmos 2020 , JFM 2021 & JFM 2023) and calculate thevelocity increments for each part.
  • 01 JUL 01 JUL
    The post holder will work at the Department of Low Temperature Physics, within a project focusing on the experimental study of wall-bounded flows of liquid helium-4.
  • 01 SEP 31 AUG
    We have funding for a Ph.D. position on fundamental turbulence modeling. The student will work in collaboration with the two advisors A. Alexakis in LPENS at École Normale Supérieure Paris, and S. Chibbaro LISN at Université Paris-Saclay. The goal of the Ph.D. would be to build and test a novel stochastic models using large-scale direct numerical simulations and machine learning. The potential candidate should have some familiarity with numerics, and motivation to study turbulent flows. For further information please see https://www.phys.ens.fr/~alexakis/StochasticModeling.html or contact us directly by email.
  • 01 SEP 31 AUG
    We are looking a postdoctoral researcher to work on the dynamics of quantum vortices in rotating superfluid helium in the framework the ANR QuantumVIW by joining the group in Nice. The QuantumVIW project aims at providing numerical and theoretical support to the experiment CryoLEM at LEGI Grenoble. This unique experiment is able to produce and visualise in real time a stable vortex lattice in rotating superfluid helium. The successful applicant is expected to perform numerical simulations of the self-consistent model FOUCAULT (and other related superfluid models), to develop analytical theories and strongly interact with all partners of the ANR QuantumVIW
  • 01 OCT 30 SEP
    Proposition de thèseModélisation stochastique pour la dynamique des particules en turbulence hétérogèneEncadrants : Rémi Zamansky, Pascal Fede, Olivier SimoninContact : remi.zamansky@imft.fr pascale.fede@imft.fr olivier.simonin@imft.fr Financement : Contrats Doctoraux MESRI 2024-2027
  • 01 OCT 30 SEP
    The aim of this thesis is to develop new tools and methodology for modelling andcontrol of bistable flows from data, by coupling state-of-the-art machine learning techniques withdynamical system theory. Closed-loop control will be implemented using model predictive control.
  • 01 OCT 30 SEP
    The aim of the project is to develop and analyze a model reduction technique for the simulation of parametric incompressible turbulent (chaotic) flows. The point of departure is the stochastic closure modeling procedure ; we shall consider the efficient treatment of parametric boundary conditions and the development of efficient hyper-reduction techniques to handle nonlinear terms.Application to large-scale three-dimensional problems will be pursued by integrating the methodology in the C++ solver Ithaca FV.
  • 01 OCT 30 SEP
    The aim of the project is to develop, analyze, validate and compare reduced data assimilation technique for 3D incompressible turbulent flows. The point of departure is the stochastic closure modeling procedure and the existing code coupled with the C++ solver Ithaca FV. The PhD student will acquire a broad vision of the data assimilation process and its limitation: from the theory, to the implementation, the data qualification and the experiments. Both synthetic and experimental data will be considered. We shall also consider the efficient treatment of unknown turbulent inflow conditions and the development of efficient hyper-reduction techniques to handle nonlinear terms.
  • 01 OCT 30 SEP
    The coastline of Nouvelle Aquitaine region is not immune to erosion and submersion risks. The thunderstorms of 2023 served as reminders. Nouvelle Aquitaine region has undertaken a reflection on territorial planning and decided to fund the CORALI program, whose objective is to provide multidisciplinary scientific knowledge necessary for better predicting coastal changes and anticipating adaptations to erosion and coastal submersion. Within the CORALI program, CURIOSITY and M2N propose a PhD thesis on the numerical modeling of wave interaction with defense structures. The thesis will involve modifying Smooth Particle Hydrodynamics methods. Numerical simulations will provide corrections to empirical laws used to quantify the performance of defense structures, including reflection coefficient (wave transmission), crest height (wave run-up), overflow discharge (wave overtopping), and structure stability (wave pressure), by incorporating the characteristics of defense structures.
  • 01 OCT 01 NOV
    he subject of this thesis is the understanding, modelling and numerical simulation of the transport of solutes, whether passive or reactive, in porous, permeable, heterogeneous and/or fractured media. The most immediate field of application is geological media, often with environmental concerns (sensitivity to contaminants, pollution clean-up), but geothermal energy also falls into this category if the solute is heat.One of the most decisive aspects, and one that is difficult to take into account in modelling, concerns mass transfers between zones of strongly contrasting properties, and in particular between fractures (which constitute the preferential paths) and the matrix (which contains most of the possible accumulation volume, and is the site of possible sorptions and/or reactions).