Annonces et offres d'emploi

Going back to Kolmogorov, there has been the paradigm in the more fundamental turbulence community of one universal state of homogeneous isotropic turbulence. In the last 15 years or so it has become more and more clear that this is not the case and that there can be several different states of turbulence, with transitions between these states. The transitions between the different states normally are of subcritical nature, just as the transition from laminar pipe or channel flow to turbulent pipe of channel flow. There, the origin of the subcritical nature is the nonnormality of the operator, combined with the nonlinearity of the Navier-Stokes equation. The nonnormality is intimately related to the local shear of the flow. All this also holds for turbulent flow, where one locally also has strong shear.

Multiphase flows are common in nature and engineering. Atmospheric flows often involve the dispersion of droplets or solid particulate matter (dust, sand, ice crystals in clouds); marine systems are populated by plankton, sediments or microplastics. Industrial applications of disperse flows include particle separators,filtration systems, atomisers and combustion devices, spray dryers, bubble columns; interfacial and free-surface flows are widespread in chemical and process industry.

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.

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.

On behalf of my fellow conveners, I would like to invite you to submit contributions to the Geophysical Fluid Dynamics (GFD) session at the AGU Annual Meeting 2026, which will be held in San Francisco (USA) from 7 to 11 December 2026. Please note that there is a strong possibility that this will be the last AGU Annual Meeting held in San Francisco for a decade, making this a particularly good opportunity to attend in person.This is a reference session for many scientists affiliated with the GDRs Mécanique des Fluides Géophysiques & Astrophysiques and Navier Stokes 2.00 and, as in previous years, we expect numerous abstract submissions from these communities.Please note that AGU and the Nonlinear Geophysics (NG) section, which hosts the GFD session, support the participation of students and early career scientists in the Annual Meeting through the AGU Honors Program, poster awards, and travel grants.

Nous proposons un sujet de thèse sur les transferts d’énergie dans les plasmas spatiaux turbulents, pour lequel nous recherchons un candidat / une candidate. La thèse s’inscrit à l’interface entre la physique des plasmas et l’étude de la turbulence dans l’héliosphère, avec un intérêt particulier pour les processus de cascade et de dissipation de l’énergie à différentes échelles.

Cette thèse vise à améliorer la compréhension et la modélisation physique de la coalescence des gouttes dans une turbulence inhomogène. Une méthodologie de simulation numérique directe sera développée et un post-traitement élaboré permettra d’extraire la fréquence de collision, le temps de contact et les forces appliquées sur les gouttes. Ces grandeurs serviront ensuite à développer des modèles de coalescence pour les bilans de populations et des lois de trainée pour les simulations Euler-Euler utilisées pour le design des extracteurs liquide-liquide. Les modèles seront ensuite intégrés dans des outils CFD métier puis testés sur un cas industriel.

One-year postdoctoral position at IMFT focusing on an experimental study of plastic transport and trapping in turbulent flows with sediments.

Postdoc de 18 mois à l’ENS Paris pour travailler sur une technologie émergente de refroidissement pour l’électronique de nouvelle génération, développée dans le cadre du projet de startup LiquiTem.Travail expérimental et numérique autour du développement de prototypes, combinant transferts thermiques, mécanique des fluides et MHD.Poste ouvert aux jeunes docteur(e)s et ingénieur(e)s de recherche, avec la possibilité de rejoindre ensuite la startup dans un rôle clé (CTO, CEO, etc.).

The PhD will focus, on the one hand, on the in situ observation and study of radiative frost events, and, on the other hand, the analysis of technological methods to combat the effects of these frosts in order to characterize their effectiveness, propose avenues for optimization, and devise viable solutions that are financially accessible to fruit growers and universal—and thus applicable to similar situations encountered in vineyards. we will evaluate the passive mixing effect generated by the interaction of the descending katabatic wind and the presence of low walls or hedges transverse to the flow. Another avenue of investigation will be to examine the source of surface radiative cooling by assessing the impact of injecting a water vapor mist at the orchard scale and its ability to inhibit radiative exchange with the atmosphere by reducing its emissivity. This study will be conducted under real-world conditions in the Belledonne massif and in situ in the orchards of Savoie.

Experimental Fluid Mechanics and Soft Matter Physics

Outils d’analyse des données d’écoulements hydrodynamiques. Caractérisation multi-échelle de processus non-linéaires à partir des données : Application à la turbulence hydrodynamique et à l’acoustique sous-marine.

Within the context of human speech productions, waveguide acoustics is well studied for steadygeometries and in absence of flow. Nevertheless, human speech sound production involvesarticulation and respiratory airflow, which are omitted from most studies dealing with the physics ofspeech production. As such, the originality of the proposed PhD is two-fold in addressing firstly theinfluence of time-varying waveguide properties (area, cross-section shapes, elasticity) on acousticwave propagation and secondly in accounting for wave propagation and generation in presence ofairflow. This last aspect implies to address the influence of waveguide dynamics on the generationand interaction of different sound sources – e.g., due to a fluid-structure interaction for voiced sounds or of aero-acoustic nature for fricatives – as well as the influence of waveguide’s wall properties on sound propagation and interaction.

We will investigate the interaction between weakly inhomogeneous turbu-lence and sedimenting particles which are larger than the smallest flow structures. The objectiveis to determine the influence of particle size and concentration on both the particle motion andthe fluid flow. The study, which will be carried out in collaboration with a partner team in Franceperforming laboratory experiments, can be expected to generate unprecedented data-sets al-lowing for new insight into long-standing problems.

This project is a postdoctoral proposal in the stochastic physics of turbulence aiming to analyze stylized models of multifractal transport and to assess their relevance for turbulent transport.

Dans le cadre du projet « MAchine LEArning for Fluid system efficiency » (MALEAF), soutenu par l’Agence Nationale de la Recherche, l’Ecole Navale recrute un chercheur post-doctorant en mécanique des fluides expérimentale, analyse et assimilation de données d’écoulement pour 2 ans.Mots clés : PIV, POD, assimilation de données, modèle d’ordre réduit, hydrofoils

https://rejoindre.onera.fr/detail-poste?nPostingId=1327&nPostingTargetId=5036&id=P6VFK026203F3VBQB68LOF6Z3&LG=FR⟨uageSelect=FR