Emplois

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CDD
fixed term contract
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
Master 2
Stage de M2 2025: durée 6 mois

Impact d’un ressaut hydraulique mobile sur la génération de turbulence dans un écoulement stationnaire et impact sur le lit sédimentaire.

Ce stage concerne l’étude expérimentale d’un ressaut en translation et tout particulièrement les phénomènes aux interfaces. L’objectif du stage est de mesurer l’impact de la déformation de surface libre sur l’écoulement et sur le fond du canal donc une interface air/eau et une interface eau/sédiment.
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5 months

Master 2 Project - Adjoint based optimization of acoustic liners' impedance

In this project, we are interested in the attenuation of an acoustic wave by an absorbent material placed on the wall of a pipe, in the presence of a flow. This configuration is typically found in aircraft engines or ventilation ducts. The objective will be to set up simple numerical simulations with a wall impedance, and then to optimize this impedance to achieve maximum absorption of the acoustic field. The average flow, which can bring some complications, will first be neglected and included in a second step. The numerical developments will be done in Matlab.
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6 months

Modeling and Experimentation of Physicochemical Interactions Between High-Temperature Water Vapor and Materials

The objective is to study how high-temperature water, resulting from hydrogen combustion, penetrates materials via grain boundaries and interacts with their structure, causing damage. This internship is part of a broader project, which will be followed by a Ph.D. project aimed at combining experimental results from various devices to develop a relevant 1D numerical model of diffusion and material damage mechanisms. Initial experiments will address two major issues: first, evaluating the characteristic times associated with diffusional-reactive mechanisms within the solid; second, processing data and images from measurements to convert them into variables that can be theoretically and numerically exploited.
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6 months

Numerical Simulation of the Physico-Chemical Mechanisms of Interaction Between a Water Mist and a Non-Premixed Flame

This internship aims to model and analyze the effect of water droplets on convective and radiative heat fluxes at the condensed fuel surface, flame structure, and unburned species using the FDS6 or FireFoam software. The primary goal is to provide general insights into the physico-chemical interaction mechanisms between the water mist and the non-premixed flame as a function of droplet size and spray velocity.
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5 mois

Stage Master 2 : Modeling acoustic flow inside a thermoacoustic regenerator

Oscillating flows are encountered in many engineering applications, such as blood flows and fluid control systems. Oscillating flows at high frequencies (i.e., acoustic flows) have much less investigated than quasi-steady oscillating flows (i.e., low frequency and high amplitude). Acoustic flows are found in many engineering applications, such as Stirling engines and thermoacoustic devices (i.e., engines and refrigerators). The change of the flow regime from laminar to turbulence is an important phenomenon because it may influence the performance of these devices. The current study focuses on thermoacoustic devices
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permanent staff
Permanents

Emploi FTC: Maître de Conférence – ISAE-ENSMA - Analyse et modélisation de l'aérodynamique turbulente à grand nombre de Reynolds

Profil du candidat : Le candidat sera un Mécanicien des Fluides ayant une sensibilité forte pour l’aérodynamique et la turbulence. Il maîtrisera la simulation numérique et aura une expérience dans la mise en place de descriptions d'ordre réduit pour la prédiction, l'estimation ou le contrôle. Approche scientifique : La modélisation physique des écoulements impliquant l'aérodynamique turbulente à nombre de Reynolds élevé est une activité de recherche clé à l'Institut Pprime...
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Emploi FTC: Maître de Conférence -CNU 60- IUT Poitiers Niort Châtellerault

Le.la candidat.e recruté.e s'intégrera dans le groupe d’acoustique de l’équipe de recherche « Acoustique, Aérodynamique, Turbulence » (2AT) du département FTC de l’institut PPRIME. Les activités du groupe ont pour élément central l’association de phénomènes acoustiques et d’écoulements complexes, et sont de nature expérimentale, numérique et analytique en couplant souvent ces divers aspects. Les études de ces phénomènes multi-physiques passent par la génération de données multi-capteurs (antennerie), relatives à des variables 3 multi-composantes (écoulement, acoustique) et de différentes natures (pression, champ de vitesse, température, etc.), et reposent sur des installations expérimentales originales : Soufflerie aéroacoustique BETI, bancs de thermoacoustique et d’acoustique non-linéaire...
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Emploi FTC: Professeur des Universités -Thermique - CNU62

L’ISAE-ENSMA (Ecole Nationale Supérieure de Mécanique et d’Aérotechnique) recrute un Professeur des Universités en Thermique. Il ou elle effectuera son enseignement au sein du département d’enseignement « Énergétique et Thermique » de l’ISAEENSMA et sa recherche dans le département Fluides, Thermique, Combustion de l’Institut Pprime. En tant que professeur, il (elle) devra en outre s’investir dans les tâches collectives de l’école et du laboratoire.
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Post-Doc
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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12 months

Job offer - Postdoctoral position: Experimental study of a free liquid surface interacting with a non-thermal plasma.

The main objectives of the project are the improvement of the free liquid surface measurements in plasma-liquid systems. The project is organized in three tasks. The first consists in designing the plasma source in contact with deionized water. The second is improving the method and use it when the liquid is exposed to DC plasma. The last task concerns the study of an aqueous solution of glycerol treated by a nanosecond discharge. We wish to recruit an experimental physicist with a good expertise in plasma physics or in fluid mechanics.
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24 mois

Postdoc : Modelling of suspended cabins in urban environments (Modélisation des cabines suspendues en milieu urbain)

This project aims to model the dynamics of suspended cabins for urban applications. During the project stability and resolvent analysis will be used to educe the key physical mechanisms of the system and to guide the construction of reduced-order models (ROMs). Ce projet vise à modéliser la dynamique des cabines suspendues pour des applications urbaines. Au cours du projet, l'analyse de stabilité et de résolvant sera utilisée pour déduire les mécanismes physiques clés du système et pour guider la construction de modèles d'ordre réduit (ROM).
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Postdoc
Stages
5 à 6 mois

PFE/Master 2 : CARACTÉRISATION ET ASSEMBLAGE DE FEUILLES EN POLYMÈRE D’OLÉFINE CYCLIQUE COMPORTANT DES TEXTURES OBTENUES PAR NANO LITHOGRAPHIE

Dans le cadre du projet TECAP (TEXTURATION DE CERAMIQUES A PARTIR DE COPOLYMÈRES BLOCS PRECURSEURS DE CERAMIQUES – Financement Région NAQ), un étudiant a travaillé pendant trois ans sur l’«Etude théorique et expérimentale de surfaces nano-texturées en régime de frottement lubrifié ». Afin de poursuivre le volet expérimental de cette thèse, d’une part, et d’en valider les modèles numériques développés, d’autre part, le stagiaire aura pour principale mission de préparer et tester des surfaces en COP (CYCLIC OLEFIN POLYMER) et/ou COC (CYCLIC OLEFIN COPOLYMER) dans le but de les assembler. Ces surfaces constitueront une paroi pour des essais rhéologiques via des écoulements de types Couette et Poiseuille.
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16 Mois

Post-doctoral - Institute DEFECT ENGINEERING TO DRIVE THE FIGURE OF MERIT OF DEGENERATE SEMICONDUCTORS (SI, SCN) FOR THERMOELECTRIC APPLICATIONS

This postdoctoral position will take place in the Department of Physics and Mechanics of Materials in PPRIME Institute under the supervision of Jean François Barbot, Sylvain Dubois and Younes Ezzahri. In our department, a great number of innovative materials are synthesized (bulk materials and thin films) and have to be characterized in terms of physical properties. As a consequence, the post-doctoral researcher will also be in charge of the electrical and thermal properties characterization of these materials. This position proposal is funded by LABEX INTERACTIVE....
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6 mois

stage M2/Ingénieur: Étude numérique des forces hydrodynamiques agissant sur des particules non-sphériques

Applications et débouchés : Applications au transport sédimentaire Outils et connaissances à utiliser : Mécanique des fluides, CFD, StarCCM+ est un plus Nature du travail : Analytique et numérique Les études par une approche mixte Eulérienne/Lagrangienne du transport sédimentaire reposaient jusqu’à récemment sur l’hypothèse de sphéricité des particules sédimentaires. Le travail de recherche dans ce domaine consiste à étudier les actions hydrodynamiques (traînée, portance et couple) agissant sur ces particules lors de leurs trajectoires et d’analyser la façon dont celles-ci sont transportées jusqu'à la paroi et/ou re-suspendues loin de la paroi. Or, dans la nature, les particules peuvent avoir une infinité de formes et de tailles. Afin prendre en compte cette non-sphéricité dans le suivi du transport de ces particules, il est important de s’intéresser au jeu de forces hydrodynamiques qui peuvent s’exercer sur ce type de particules. Ce travail vise donc à déterminer les forces hydrodynamiques agissant sur des particules non-sphériques en fonction de l’écoulement, de la forme et de l’orientation des particules (traînée, portance, couples). L’étudiant devra, dans un premier temps, réaliser une analyse bibliographique et d’en extraire les paramètres de l’étude. Ces paramètres seront ensuite utilisés dans les simulations numériques d’un écoulement autour de ces particules. Ces simulations seront réalisées en utilisant le code CFD StarCCM+ .
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5 mois

Stage Master 2 - Etude du comportement hygromécanique de panneaux isolants à base de fibres de bois sous conditions tropicales : développement et mise en œuvre de bancs de mesure

Objectifs du stage : Le stage a pour objectif de développer les bancs d’expérimentation nécessaires pour évaluer la durabilité des panneaux isolants dans les deux premières configurations décrites précédemment. Le premier système est un banc de stéréovision à deux caméras implantables dans les répliques d’habitation et résistant aux conditions tropicales
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16 Mois

Stage post-doctoral - INGÉNIERIE DES DÉFAUTS POUR LE CONTRÔLE DES PROPRIETES THERMIQUES DES MATÉRIAUX THERMOÉLECTRIQUES

Ce projet sera réalisé dans le département de Physique et Mécanique des Matériaux sous la direction de Jean François Barbot, Sylvain Dubois et Younes Ezzarhi. Au sein du département, un grand nombre de matériaux innovants sont synthétisés (sous la forme de matériaux massifs ou de films minces) et doivent être caractérisé en termes de propriétés physiques. En conséquence, le post-doctorant recruté aura aussi en charge la caractérisation des ces matériaux innovants. Ce stage post-doctoral est financé via le LABEX INTERACTIF....
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Thèses
theses
36 mois

BIOMIMETISM AND BIOINSPIRATION OF THE ANGUILLIFORM SWIM OF A SNAKE

The performance of aquatic locomotion is closely related to the circulation of the flow around the animal's body and primarily to the intensity of the induced flow downstream of the tail and its characteristics. This developing wake consists in a Von Karman street vortices whose vortices are periodically emitted with each flap of the tail. The way the tail moves in the fluid (angle of attack, amplitude, frequency ...) determines the swimming performance. Animals can adjust their swimming kinematics to optimize their performance. Different criteria can define performance, such as energy efficiency, maximum speed (prey-predator system), or even stealth. The shape of the body and the tribological properties of the skin, which influence the propulsion and drag produced by swimming animals, must be taken into account. The central objective of this thesis is to contribute to the development of a numerical model based on real data such as geometry, kinematics, skin texture (data-driven numerical modeling) in order to simulate the complex phenomena of unsteady fluid-structure interaction (FSI), involved in anguilliform swimming within an incompressible viscous flow in the presence of a free surface.The aim is to identify the hydrodynamic mechanisms that will allow us to obtain estimates of the efficiency of this swimming in terms of propulsive force and energy efficiency, based on the kinematic and velocimetric data that characterize the swimming of snakes. This thesis work is part of a larger ANR (Dragon II) project in which biologists, fluid mechanics, mathematicians and roboticists are involved. A strong link will be maintained with the experimentalists of the project and experimental data on the swimming of real snakes and bio-inspired robots will be made available in order to validate the numerical model. The candidate will be required to participate in measurement campaigns at the Ecole Supérieure de Physique et de Chimie Industrielles in Paris, at the PPRIME Institute in Poitiers and at the Center for Biological Studies in Chizé .
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Thèses
36 Mois

CDD Doctorant : Influence de la Navigation FLUviale sur l’Environnement - Étude numérique et expérimentale des ondes de batillage de leurs impacts sur les berges

Annonce 2023-001-NM-DFTC A l’Université de Poitiers, au sein du Laboratoire Pprime – UPR3346, cette offre d’étude doctorale entre dans le cadre du projet INFLUE, Influence de la Navigation FLUviale sur l’Environnement, financé par l’ANR, l’Agence Nationale pour la Recherche, dans lequel 5 partenaires sont engagés : l’Institut PPRIME (CNRS-Université de Poitiers), le laboratoire Roberval (Université Technologique de Compiègne), le CEREMA, l’Établissement Public Territorial des Bassins Saône et Doubs et VNF (Voie Navigable de France).
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3 years, from October 2024

MODIFIED ISPH METHOD FOR MODELING THE WAVES INTERACTION WITH THE COASTAL PROTECTION STRUCTURES

Coastalization refers to the dual process of increasing attractiveness of the coastline and the transformation of coastlines due to the intensification of human presence and activities, observable since the 1970s. Coastal erosion and submersion are risks associated with coastalization. To protect the coastline, defense structures have been built at high costs...
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theses
3 years, from October 2024

MODIFIED ISPH METHOD FOR MODELING THE WAVES INTERACTION WITH THE COASTAL PROTECTION STRUCTURES

Coastalization refers to the dual process of increasing attractiveness of the coastline and the transformation of coastlines due to the intensification of human presence and activities, observable since the 1970s. Coastal erosion and submersion are risks associated with coastalization. To protect the coastline, defense structures have been built at high costs...
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Thèses
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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Thèses
36 months

PhD proposal 2025 : Experimental fluid mechanics and acoustics - Oscillating flows

Applicants are invited for a 3-year Ph.D. studentship in Pprime laboratory at the University of Poitiers. The successful candidate will have the opportunity to work within a research team of an ANR-funded project, named ImClean, willing to improve the performance of thermoacoustic refrigerators. These offer a green alternative to conventional refrigeration systems as they use environmentally friendly gases. Besides their simple construction, they include less mechanical moving parts and hence require less maintenance. However, their performance is impacted by several non-linear phenomena such as streaming, natural convection, transition to turbulence. Both understanding and quantifying the effects of these non-linear phenomena on performance are vital for designing more performant refrigerators. This PhD Project focuses on quantifying the effects of both the transition to turbulence of oscillating flow and flow discontinuities on acoustic energy losses.
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36 months

PhD Thesis 2025 : Numerical simulations of acoustic liners in turbulent wall-bounded flows

A significant part of the noise emitted by airplanes comes from the engines, and more particularly from the fan. To reduce this noise, sound absorbing materials (acoustic liners) made of wall cavities are used. The high speed turbulent grazing flow in the engine interacts with the acoustic liner, modifying its acoustic properties on one hand, and increasing the drag on the other. In this PhD thesis, high fidelity numerical simulations will be performed with code AVBP to elucidate the physics involved in this interaction.
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theses
Thèses
theses
Thèses
theses
36 months

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

This PhD offer has already been filled. 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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