Annonces

This textbook deals with wave turbulence and systems composed of a sea of weak waves interacting non-linearly. After a general introduction which includes a brief history of the field, the theory of wave turbulence is introduced rigorously for surface waves. The theory is then applied to examples in hydrodynamics, plasma physics, astrophysics and cosmology, giving the reader a modern and interdisciplinary view of the subject.

Bruno Chaouat et Roland Schiestel viennent de publié dans les Comptes Rendus Mécanique de l'Académie des Sciences un article de revue très complet sur les avancées depuis les 50 dernière années en matière de modélisation et simulation CFD :Roland Schiestel; Bruno Chaouat. Turbulence modeling and simulation advances in CFD during the past 50 years. Comptes Rendus. Mécanique, Online first (2022), pp. 1-29. doi : 10.5802/crmeca.114.

La date limite de dépôt des projets de symposia IUTAM pour 2024-2025 est le 31 mars 2022, celle pour les colloques EUROMECH 2023-2024 est le 15 avril 2022.

Ce projet consiste essentiellement en un institut sans mur, à vocation nationale, capable de fédérer largement la communauté mathématique pour aborder des questions provenant d’autres domaines scientifiques dans une approche nécessairement pluridisciplinaire.

Le parcours master M2 TMA (Turbulences : Méthodes et Applications) propose une nouvelle formation originale sur une thématique scientifique complexe et essentielle. L'approche pédagogique est inovante en recentrant d’abord l’enseignement sur la discipline scientifique, en l’occurrence la turbulence.

L'ouvrage intitulé « Physique de la turbulence: des tourbillons aux ondes » (280 pages), écrit par Sébastien Galtier, vient d’être publié chez EDP Sciences - collection Savoirs Actuels.

Création de la Division Physique Non Linéaire (DPNL) de la Société Française de Physique (SFP)

Cet ouvrage présente les bases de la turbulence aux chercheurs en écologie marine, et les couplages de l’écologie marine avec la turbulence, aux chercheurs en turbulence provenant d’autres disciplines. Il s’adresse aux doctorants, jeunes chercheurs et chercheurs confirmés intéressés par ces deux sujets et leurs interactions.

We are pleased to announce the publication of the Special issue of the Comptes-Rendus Mécanique dedicated to the memory of Yves Couder. Several contributions written by his former students, colleagues and friends celebrate the research themes and teaching experiences which have marked the career of this remarkable Professor.

The Leeds Institute for Fluid Dynamics is delighted to partner with the Department of Applied Mathematics and Theoretical Physics at the University of Cambridge, the UK Fluids Network, and the Journal of Fluid Mechanics to deliver a regular webinar series on fluids-related topics.

Les deuxièmes rencontres annuelles du GDR "Défis théoriques pour les sciences du climat" auront lieu du 5 au 7 juin 2023, à l'IHP à Paris.

Aerovehicles 5 is meant as a place where engineers and researchers can exchange their ideas and progress in ground vehicle aerodynamics. It is a forum for engineers and scientists from both industry (manufacturers and operators of road vehicles and trains) and universities to present and discuss recent advances and latest methodologies in the field of vehicle aerodynamics, and identify research needs concerning: physical modelling; numerical predictions; experimental approaches and analysis of huge data fields.

An OPENING WORKSHOP ON TURBULENT FLOWS is scheduled for the LTP’s first week, specifically from Tuesday 20 to Thursday 22 June 2023. The presentations at the workshop will be broadcast by videoconference. The workshop is open (with no fee) to external audience with a maximum of 10 on site people and no limit by visio-conference. See https://lmfl.cnrs.fr/workshop/ltp-2023-program-registration/

The school aims to provide modern and eclectic viewpoints from the mathematics and physics community on the concept of cascades. For more details, please visit the school website : https://univ-cotedazur.eu/events/turbulence-semester/summer-school.Applications are now open, until April 1. 2023.

This advanced course will be delivered at CISM on the topic of Lagrangian Approaches to Multiphysics Two-Phase flows. The aim of this course is to explore multiphysics and multiscale aspects of two-phase flows through particle tracking methods (covering a range of experimental and numerical methods).

In the context of the CNRS Chair in Physical Hydrodynamics, we would like to recruit a PhD student to work at Institut Pprime on theoretical and numerical work related to black-hole laser instabilities and undulations in open channel flows.https://emploi.cnrs.fr/Offres/Doctorant/UPR3346-NADMAA-083/Default.aspx

We are looking for a highly motivated Post-Doc for a project at the frontier of fundamental fluid mechanics and mechanical engineering, coupling numerical and experimental approaches.

Theoretical/numerical study on the interactions between a vortex and a fluid interface. Application (motivation letter and detailed CV) should be sent to the contacts before 21 june 2023.

A PhD position is open at LEGI to work on simulations of quantum turbulent flows (observed for instance in superfluid helium) at the absolute zero, where they are described as a collection of interacting vortex filaments. The main objective is to investigate the possible similarities between quantum and classical turbulence, in order to strengthen the link between both systems.

Vorticity Transport Model for rotary wing aircraft: application to the predesign of advanced hybrid VTOL aircraft – Application deadline: 21 July 2023

At very high Rayleigh numbers, a very intense heat transfer regime appears for which the triggering mechanisms are still poorly understood. Using HPC numerical simulations and physics-guided machine learning techniques, we seek to extract from data physical information bringing to light the multi-scale interactions between different turbulent flow structures.

Unité de Mécanique de Lille is looking for a PhD student to work on the project “Lagrangian transport of microplastics in nonhomogeneous upper-ocean turbulent flows“.

Depuis le vote de la Loi sur les Opérations Spatiales en 2008, différents outils CNES ont été développés pour l’analyse des risques associés à la rentrée atmosphérique de structures spatiales telles que des lanceurs ou satellites. Différentes stratégies sont employées en fonction de l’objectif de l’outil, du temps de calcul disponible et le degré de fidélité nécessaire. L’ensemble des phénomènes physiques doivent être modélisés avec précision, ceci afin de garantir que les débris retombant au sol ne présentent pas un risque pour la population.La dégradation de satellites étant très complexe, à la fois dépendante des propriétés matériaux dde l’objet et de la précision des flux thermique à la paroi de la structure, son étude pour une modélisation précise est encore au stade de la recherche. En collaboration avec R.Tech et le laboratoire LMFL, 2 objectifs sont visés :1 améliorer les outils numériques du CNES2 Mettre sur pied une expérience sol de dégradation d’une maquette satellite

Cette thèse propose l'étude des extrêmes dans la couche limite atmosphérique urbaine ainsi que leur impact sur le vol des drones, à l'aide du code de simulation météo mésoNH et d'outils dédiés, à l'ONERA Lille et au LMFL.

This doctoral thesis aims to study in depth the physical mechanisms governing the expansion of a wind turbine wake within a turbulent background. To this end, the work will be based on the combination of high-quality experiments and high-fidelity simulations. Particular attention will be paid to the influence of the characteristic quantities of the external turbulence on the aerodynamic performance of the wind turbine, on the expansion of its wake and its dynamics. The physical analysis of experimental and numerical data will be used to formulate new models of wake expansion that are more relevant than those currently used for the design of wind farms.

The student will take part of the joint ANR research program MUFDD (Modelling Urban Flows using Data-Driven methods) between IMFT, LHEEA (Ecole centrale of Nantes) and PPRIME (Poitiers), to support the experimental activities carried out at IMFT. The work will focus on isothermal street canyon urban canopy configuration. Experiments will be performed in the large, 26 m long and 1.1 m wide, hydraulic flume of IMFT with optical access for laser optical measurements (LDV, PLIF, TomoPIV).

How do rain droplets form in clouds? How pollutants, viruses or volcano ashes disperse in the atmosphere? Where can they fall and at which speed? How plankton dynamics is affected by sea conditions? What are the consequences on the trophic chain? What are the optimal parameters for a wastewater treatment plant, for an engine, a chemical reactor? All these questions find answers in the study of inertial particles in turbulence. Such particle laden flows are ubiquitous but so complex to study due to the very large number of intertwined control parameters and the lack of theoretical predictions.

PhD thesis, starting in October 2023, for three years.Multi-scale interactions in the atmosphere. Application to the prediction of heat waves and urban heat islands

Large-scale plunging jets encountered in hydroelectric infrastructures directly influence turbine operation and performance through their ability to generate huge bubble clouds and thereby draw air into the pipelines under load. Nevertheless, despite the relevance of applications, something as fundamental as predicting the flow rate of air entrained in a pool by a plunging jet is still an open question.This postdoc project consists on an experimental study that involves LEGI lab, CERG center and EDF, and aims at providing a better understanding of these flows within hydroelectric installations.I this context, a key parameter for the modelling and scale-up of these flows is the ability of a jet to entrain air under the free surface that it impacts and the characterization of its sub-surface dynamics. Other important parameters are the size distribution of the bubbles generated, the entrained air flow rate and the spatial distribution of local quantities of interest.

La convection thermique turbulente constitue un problème omniprésent dans de nombreuses situations naturelles. Elle peut être modélisée en laboratoire par la cellule de Rayleigh-Bénard. Il s’agit d’une couche de fluide confinée entre deux plaques horizontales. Le fluide est chauffé par le bas, et refroidi par le haut. Les couches limites thermiques se forment au voisinage des plaques. L’instabilité de flottabilité conduit à la germination de structures cohérentes, applées panaches thermiques. Ces panaches et leur interaction donnent naissance à un mouvement global (la circulation grande échelle). Lorsque le forçage est suffisamment intense, l’écoulement peut devenir turbulent, et le comportement global est déterminé par la compétition entre les effets purement inertiels, le forçage thermique local et l’interaction entre panaches.

This project is multidisciplinary and focuses on the development of new Deep Learning models for non-linear multiscale characterization with applications in fluid turbulence, remote sensing images and the combination of both to study ocean dynamics.

Deux postes d'AGPR en physique ouverts à l'ENS-Paris à partir de septembre 2013 pour une durée de 3 ou 4 ans

Hyperpycnal sediment-laden river plumes in lakes: flow-sediment-bathymetry interactions

Offre de thèse, Univ. Bristol UK

OPAALE INRAE, located in Rennes, France, is seeking highly motivated postdoctoral Marie Skłodowska-Curie candidates to work on a cutting-edge project using volumetric velocimetry data to reconstruct high-resolution turbulent flow fields. We are seeking candidates with expertise in machine learning or data assimilation to join our team and use this valuable dataset to train flow reconstruction models.We recently conducted a massive experimental campaign and obtained high-quality data from nearly 200 experiments with various scenarios, including cylinder, step cylinder, flat plate, step plate, wall-bounded cylinder, and more. Our dataset consists of approximately 12 billion trajectories recorded in total for a variety of Reynolds numbers. This is a unique experimental dataset to train machine learning algorithms.

A one-year post-doctoral position is opened at LEGI, in the EDT team, to conduct experimental research on the influence of surface conditions for spray impact, with applications to spray cleaning. While the appointment is at LEGI, the post-doc will also work at LIPhy, in the MODI team, since this is a collaborative project between researchers at both labs.

a thesis offer is available in our group, at the Physics Laboratory of the ENS of Lyon, on the Aerodynamics of butterfly flight in altered gravity.The thesis, co-financed by the CNES, aims at providing a detailed experimental characterization of the flight of butterflies in micro and hyper-gravity, in order to study the evolution of the characteristics of the flapping flight and to elucidate the aerodynamic couplings at the origin of the thrust and the lift as a function of the gravity level. For that, experiments in turntable and parabolic flight will be performed.

Post-doc dans le cadre de l'ERC NoStaHo (Non-stationary and non-homogeneous turbulence)

The design and operation of future large wind turbines require an in-depth understanding of the interaction between the rotor and the turbulent wind in the atmosphere. To this end, we will scan the entire wind field in front of, at and close behind two multi-megawatt wind turbines with a high spatial and temporal resolution, using the laser-based scanning technique lidar (light detection and ranging).Our two short-range WindScanners are continuous-wave Doppler wind lidars. They remotely measure the wind speed component along the beam direction (line-of-sight wind speed) at several hundred positions each second. A wind field can be reconstructed using these point measurements and additional meteorological information. In this project, particular focus will lie on wind field reconstructions using novel stochastic methods, which consider statistical features of small-scale turbulence.

L'objectif de ce post-doctorat est de réaliser et d'exploiter des simulations directes de turbulence compressible homogène avec forçage, de façon à mettre en évidence les propriétés inertielles de la circulicité.

The present project is at the interface between Maths and Physics and aims at providing accurate, efficient and predictive modeling tools for the transport of particles and pollutants in turbulent conditions as encountered in natural atmospheric and oceanic conditions.

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.

IFISC (Institute for Cross-Disciplinary Physics and Complex Systems) offers a postdoc position to work on the research project "Lagrangian transport of marine litter and microplastics in coastal waters: structures of transport and connectivity patterns".

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.

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.

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.

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.

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.

A postdoctoral position is open to study experimentally the statistical properties of turbulence in a stratified medium in the Coriolis facility.

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.

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

The objective of this postdoc position is to improve the CYCLONE library developed by RTECH, possibly by incorporating a different type of Immersed Boundary Method (IBM), such as the sharp interface method, which is presently under investigation at Pprime Institute.

In atmospheric clouds, in industrial power plants, and in the pandemic we have been living, a crucial element is the interaction of small particles with the turbulent flow that carries them. Will two ice crystals collide and aggregate to form a snowflake? Will an ocean wave break and splash droplets in the atmosphere? How far will a drop of saliva travel in air? Particle-laden turbulent flows are ubiquitous and extremely challenging to predict: the chaotic motion of the fluid is intertwined with the particles’ ability to exchange momentum and energy at the microscopic scale, while also altering the flow globally.

Multiple PhD positions are available at Eindhoven University of Technology in the field of turbulence research.

This thesis will focus on internal tidal waves (at diurnal and semi-diurnal frequencies), and may further extend to other type of ocean internal wave (e.g. near-inertial waves).

The School of Science and Engineering at Reykjabik University (Iceland) is looking for a PhD student to work on the project “Lagrangian Dispersion in Mixed Convective Turbulence “.

Au sein du Service commun d’Assistance Technique à l’Enseignement et à la Recherche (SATER) ducampus de Lille, vous intégrerez une équipe de 13 personnes. Plus particulièrement, le candidat retenucontribuera à la structuration et aux développements des activités des laboratoires LMFL et L2EP dans ledomaine de la simulation numérique en Mécanique des Fluides (LMFL) et en Electromagnétisme (L2EP). Ilsoutiendra également, en pédagogie, les travaux de développement de jumeaux numériques des installationsexpérimentales du Campus ENSAM de Lille.

Un poste de Maitre-esse de conférence est ouvert au concours à Grenoble INP - UGA attaché à l’école Grenoble INP - ENSE3 et au laboratoire LEGI dans les domaines de l’hydroélectricité, machines tournantes et les énergies renouvelables. Voir ci-dessous pour le profil détaillé.

Le poste, d'une durée initiale de deux ans, concerne la mise en place et laréalisation des essais de ces deux campagnes. Pour la première ils'agit de participer à la conception et la réalisation d'un canal hydraulique enspirale, intégré dans une cuve à placer dans l'aimant 4T du laboratoire Neel, dechoisir et étalonner des moyens de mesure de pression et débit compatibles avec le champ magnétique, et deréaliser les essais sous champ. Pour la seconde il s'agit de réaménager la boucle à eau salée existante pour la rendre compatible avec le futur aimant 10T, et de caractériser l'écoulement sans champ magnétique pardes mesures locales de vélocimétrie laser (en plus des mesures de débit et pression déjà utilisées à 4T).

Profil: Mécanique des Fluides; Département de Mécanique, Faculté des Sciences et Technologies, Université de Lille; Laboratoire de Mécanique des Fluides de Lille - Kampé de Fériet (UMR 9014).

Mécanique des fluides / modélisation expérimentale ou (et) numérique. Section 60.

Profil : Dynamique des Fluides et des TransfertsComposante : Faculté des Sciences d’Orsay, Université Paris‐SaclayLaboratoire d’accueil : Fluides, Automatique et Systèmes Thermiques (FAST), UMR 7608 Nature du poste : Maître de ConférencesCNU : 60Type de concours : 46‐1