Annonces

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.

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.

PROGRAMME 2024 www.cism.it

ICMF submission webpage is here: https://www.icmf2025.com/submission/

The 26th ICTAM, to be held in Daegu, South Korea in August 2024, is an historic and momentous international congress, celebrating its centennial milestone.

We are pleased to announce the workshop "Physics of wave turbulence and beyond", to be held in Les Houches, France, from September 2 to 6, 2024. The workshop will discuss the state of the art in wave turbulence, along with modern challenges in theory, numerics and experiments. It will also celebrate the 60th birthday of Sergey Nazarenko, whose work over the past 30 years has significantly contributed to the understanding and current research dynamics in wave turbulence. To register, please visit https://60waves.github.io/Houches2024/.

The school will introduce participants to several topics at the frontier between fluid dynamics, fundamental physics and mathematics. The main themes concern current challenges in turbulence, including anomalous diffusion, boundary layers, spontaneous stochasticity and wave interactions.

L’équipe Curiosity de l’institut Pprime souhaite recruter un.e doctorant.e (ou un.e post-doctorant.e) dans le cadre d’une collaboration avec les Voies Navigables de France (VNF) et le Laboratoire de Mathématiques et Applications (LMA) de Poitiers afin d’étudier la navigation en milieu confiné dans une optique d’interaction fluide-structures. En complément à un post-doctorat en cours sur une revisite des travaux théoriques sur les effets de confinement hydraulique et ondulatoire pour un bateau fluvial en interaction avec l’ouvrage (typiquement un canal à forme trapézoïdal), nous souhaitons désormais alimenter les études théoriques par des expériences permettant de cribler les modèles ainsi que de guider les modélisateurs vers les modèles pertinents du fait de lacunes dans la compréhension des phénomènes tels que révélées par l’analyse de la littérature et que les expériences pourraient combler.

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.

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.

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.

This PhD project aims at modelling the dynamics of long flexible fibers in wall-bounded turbulent flows, in particular close to the walls where the turbulence is inhomogeneous and anisotropic. To tackle this challenging problem, the project will primarily utilize an experimental approach complemented by direct numerical simulations and physical modelling.

The post-doc will run a new experimental setup aiming at reaching the weakly non-linear wave turbulence regime in a stratified (and rotating) fluid. The objective is to test the theoretical predictions of the Weak Turbulence Theory which might be relevant to describe the turbulent dynamics of the oceans at small scales but remains controversial.

Analogue Gravity allows us to mimic the propagation of fields in curved spacetime with waves in a condensed matter system, thus making certain gravitational phenomena accessible to experiment. The best-known example of such a phenomenon is Hawking radiation, which is likely far too weak to be observed in an astrophysical context. The system of surface waves on an open channel flow is studied for this purpose at Institut Pprime in Poitiers. An analogue of the Hawking effect takes place at an effective horizon where the flow speed becomes faster than the wave speed. While this effect has been observed, the Hawking regime in which the scattering behaves in accordance with a thermal (Planck) spectrum has yet to be realized in a water wave system. The goal of this thesis will be to provide theoretical insight into how to reach the Hawking regime and the optimisation of the seeding of the Hawking process.

The post-doc will carry out numerical simulations of the flow around a free-moving gondola. These simulations will enable a very detailed study of the phenomena involved in pendulum dynamics. These studies are part of the ANR TURB-Cab project.

L’équipe Curiosity de l’institut Pprime souhaite recruter un.e post-doctorant.e dans le cadre d’une collaboration avec les Voies Navigables de France (VNF) et le Laboratoire de Mathématiques et Applications (LMA) de Poitiers afin d’étudier la navigation en milieu confiné dans une optique d’interaction fluide-structures. En complément à un post-doctorat en cours sur une revisite des travaux théoriques sur les effets de confinement hydraulique et ondulatoire pour un bateau fluvial en interaction avec l’ouvrage (typiquement un canal à forme trapézoïdal), nous souhaitons désormais alimenter les études théoriques par des expériences permettant de cribler les modèles ainsi que de guider les modélisateurs vers les modèles pertinents du fait de lacunes dans la compréhension des phénomènes tels que révélées par l’analyse de la littérature et que les expériences pourraient combler.

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).

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

Within the ANR MUFDD project, a major challenge is to account for the strong complexity and variability of urban flows due to the change in atmospheric stability. Urban flows are known to be highly complex and to have a high variability. These limitations are exacerbated when buoyancy effects are taken into account and added to wind-shear effects. Deriving reduced-order models which are versatile and robust with respect to a change in boundary conditions such as wind speed or atmospheric stability remains crucial.The main objective of the position opening at LHEEA is to build upon previous work conducted by the DAUC group on the dynamics of isothermal street canyon flows to investigate the influence of buoyancy on the spatio-temporal characteristics of street canyon flows via a series of detailed wind-tunnel experiments. Attention will be devoted to the dynamics of the coherent structures within and above the canyon, and to their interaction with those of the oncoming boundary layer.

The main objective of this project is to further develop a new methodology to generate inflow conditions for aerodynamics and aeroelastic codes for floating offshore wind turbines operating in the wake of an upstream wind turbine. Accounting for the correct characteristics of the oncoming wind is crucial for the accuracy of aeroelastic simulations.Promising results have been obtained in previous work (https://doi.org/10.5194/wes-8-1711-2023), based on directly coupling wind tunnel experiments to an aeroelastic code. The goal of the opening position is to further improve this approach, in particular by assessing the potential of using high-speed stereoscopic PIV, as well as investigating the degree of representativity of the generated inflow conditions required to perform satisfactory aeroelastic simulations.

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.

Toutes les informations sur cette annonce de postdoc sont accessibles sur le portail du CNRS:https://emploi.cnrs.fr/Gestion/Offre/Default.aspx?Ref=UMR7648-SEBGAL-001

This project focuses on the dynamics of quantum vortices in rotating superfluid helium. In particular, it aims to provide numerical and theoretical support to the experiment CryoLEM at LEGI Grenoble. This unique experiment can 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. This recently developed model can accurately describe the interaction between quantum vortices and the normal fluid. More precisely, the project aims to understand the effect of rotation and counterflow (mean relative velocity between the superfluid and the normal fluid) on the dynamics of quantum vortices and the normal fluid. Other superfluid models might be used to complement and answer related scientific questions. This project contains an important numerical part, but analytical theories will be developed whenever possible.

The postdoc project involves developing and using the Wave Turbulence approach for describing random nonlinear waves in geophysical situations: internal and inertial waves in the ocean and atmosphere, water surface waves, planetary Rossby waves. The project includes advancing and validating the theoretical approach using the numerical simulations of the wave kinetic equations and comparing them with simulations of the dynamical fluid models, laboratory experiments and field observations. Applications to describing the ocean mixing and other transport phenomena important for weather and climate modeling will be considered.

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.

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.

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).

Université Côte d’Azur is opening this year a Junior Professor Chair in “Soft Matter and Fluid Dynamics” at the Institut de Physique de Nice (INPHYNI).

Le CNRS ouvre une CPJ (Chaire Professeur Junior) CNRS, en Physique Statistique et IA pour un recrutement dans l'un de ces trois laboratoires : Institut de Physique Théorique de Saclay, Laboratoire Charles Coulomb Montpellier, Laboratoire de Physique de l’Ecole Normale Supérieure de Lyon.

Nous recherchons un ingénieur de recherche en mécanique des fluides spécialisés dans la modélisation des écoulements à phase dispersée pour renforcer l’équipe et accompagner la demande en croissance dans ce domaine d’activité.