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IMFT

Groupe FEP
Allée du Professeur Camille Soula
31400 TOULOUSE

Tél: 05 34 32 28 07 (IMFT)

Email: jacques.magnaudet@imft.fr / jmagnaud@imft.fr

I am a Senior Researcher at CNRS (the French National Center for Scientific Research), working at the Fluid Mechanics Institute of Toulouse (IMFT).

My research focuses on several fundamental aspects of hydrodynamics and turbulence in two-phase flows and inhomogeneous fluids, mostly studied by means of computational and theoretical approaches.
I also closely collaborate with experimentalists and occasionally directly supervise simple experiments myself.

I have been especially involved in two main areas :

• the dynamics of particles, drops and bubbles, most notably
– the determination of forces acting on these bodies when they move in non-uniform or time-dependent flows ;
– their hydrodynamic interactions with similar neighboring entities or walls ;
– the motion and possible trapping of bubbles and particles in vortical structures and the way a collection of these bodies alters vortices or generates specific flow patterns ;
– how phase change or contamination by surfactants modifies the dynamics of rising bubbles and spreading drops ;
– the topological changes that may be experienced by large rising bubbles or by drops spreading on a liquid surface in the presence of Marangoni effect ;
– the path instability of bubbles and rigid bodies freely moving under the effect of gravity or buoyancy ;
– the dynamics of bubbles and particles crossing a sharp interface separating immiscible liquids ;
– the flow structure about rigid particles settling in a density-stratified fluid and their specific dynamics.

• the structure, energy transfer across scales, and mixing properties of non-standard inhomogeneous turbulence, especially
– spectral transfers and boundary-layer structure in free-surface turbulence ;
– high-Schmidt-number mass transfer across walls and free surfaces ;
– the structure of turbulence beneath surface waves ;
– the physics of gravitationally-induced turbulence in open and confined geometries ;
– wall and end effects in high-Reynolds-number gravity currents.

To study these phenomena, I use and sometimes develop a variety of techniques. Some of them are analytical, including perturbation approaches or vector field decomposition, others are computational. In particular, I developed, first by myself, then with successive generations of students and colleagues, the in-house computational JADIM code which solves the Navier-Stokes equations, possibly coupled with the transport of a passive or active scalar such as temperature, density or surfactant concentration. This code includes boundary-fitted as well as fixed-grid approaches, allowing an accurate capture of interfacial phenomena ; it is suitable for performing direct numerical simulations of two- and three-phase flows, possibly with rigid moving bodies and interfacial topological changes, from low-Reynolds-number to fully turbulent regimes.

Thanks to these various tools, I try with my students and colleagues to disentangle and dissect the physical mechanisms at play in the above types of flow. This frequently yields predictions in the form of generic laws which are then used by the relevant community to understand, predict and sometimes optimize the properties of complex flows of engineering or geophysical relevance.



63 documents

Articles dans une revue

  • Paul Bonnefis, Javier Sierra Ausin, David Fabre, Jacques Magnaudet. Path instability of deformable bubbles rising in Newtonian liquids: A linear study. Journal of Fluid Mechanics, 2024, 980, pp.A19. ⟨10.1017/jfm.2024.19⟩. ⟨hal-04455958⟩
  • Florent Burdairon, Jacques Magnaudet. A combined VOF-RANS approach for studying the evolution of incipient two-dimensional wind-driven waves over a viscous liquid. European Journal of Mechanics - B/Fluids, 2023, 102, pp.150-167. ⟨10.1016/j.euromechflu.2023.08.001⟩. ⟨hal-04189597⟩
  • Tristan Aurégan, Thomas Bonometti, Jacques Magnaudet. Flow past a sphere translating along the axis of a rotating fluid: revisiting numerically Maxworthy's experiments. Journal of Fluid Mechanics, 2023, 967, pp.A25. ⟨10.1017/jfm.2023.469⟩. ⟨hal-04165883⟩
  • Paul Bonnefis, David Fabre, Jacques Magnaudet. When, how, and why the path of an air bubble rising in pure water becomes unstable. Proceedings of the National Academy of Sciences of the United States of America, 2023, 120 (11), ⟨10.1073/pnas.2300897120⟩. ⟨hal-04024265⟩
  • Fabien Candelier, Rabah Mehaddi, Bernhard Mehlig, Jacques Magnaudet. Second-order inertial forces and torques on a sphere in a viscous steady linear flow. Journal of Fluid Mechanics, 2023, Journal of Fluid Mechanics, 954, pp.A25. ⟨10.1017/jfm.2022.1015⟩. ⟨hal-03859012⟩
  • Javier Sierra-Ausin, Paul Bonnefis, Antonia Tirri, David Fabre, Jacques Magnaudet. Dynamics of a gas bubble in a straining flow: Deformation, oscillations, self-propulsion. Physical Review Fluids, 2022, 7 (11), pp.113603. ⟨10.1103/PhysRevFluids.7.113603⟩. ⟨hal-03858749⟩
  • Jie Zhang, Ming-Jiu Ni, Jacques Magnaudet. Three-dimensional dynamics of a pair of deformable bubbles rising initially in line.: Part 2. Highly inertial regimes. Journal of Fluid Mechanics, 2022, 943, pp.A10. ⟨10.1017/jfm.2022.416⟩. ⟨hal-03700589⟩
  • Jean-Luc Estivalèzes, Wojciech Aniszewski, Franck Auguste, Yue Ling, Ludovic Osmar, et al.. A phase inversion benchmark for multiscale multiphase flows. Journal of Computational Physics, 2022, 450, pp.110810. ⟨10.1016/j.jcp.2021.110810⟩. ⟨hal-03419715v2⟩
  • Dolachai Boniface, Julien Sebilleau, Jacques Magnaudet, Véronique Pimienta. Spontaneous spinning of a dichloromethane drop on an aqueous surfactant solution. Journal of Colloid and Interface Science, 2022, 625, pp.990-1001. ⟨10.1016/j.jcis.2022.05.154⟩. ⟨hal-03760210⟩
  • Pengyu Shi, Roland Rzehak, Dirk Lucas, Jacques Magnaudet. Drag and lift forces on a rigid sphere immersed in a wall-bounded linear shear flow. Physical Review Fluids, 2021, 6 (10), pp.104309. ⟨10.1103/physrevfluids.6.104309⟩. ⟨hal-03413058⟩
  • Jean-Lou Pierson, Mohammed Kharrouba, Jacques Magnaudet. Hydrodynamic torque on a slender cylinder rotating perpendicularly to its symmetry axis. Physical Review Fluids, 2021, 6 (9), pp.094303. ⟨10.1103/PhysRevFluids.6.094303⟩. ⟨hal-03356843⟩
  • Mohammed Kharrouba, Jean-Lou Pierson, Jacques Magnaudet. Flow structure and loads over inclined cylindrical rodlike particles and fibers. Physical Review Fluids, 2021, 6 (4), pp.044308. ⟨10.1103/PhysRevFluids.6.044308⟩. ⟨hal-03215136⟩
  • Jie Zhang, Ming-Jiu Ni, Jacques Magnaudet. Three-dimensional dynamics of a pair of deformable bubbles rising initially in line. Part 1. Moderately inertial regimes. Journal of Fluid Mechanics, 2021, 920, pp.A16. ⟨10.1017/jfm.2021.429⟩. ⟨hal-03382547⟩
  • Jacques Magnaudet, Micheline Abbas. Near-wall forces on a neutrally buoyant spherical particle in an axisymmetric stagnation-point flow. Journal of Fluid Mechanics, 2021, Special JFM volume in celebration of the George K. Batchelor centenary, 914, pp.A18. ⟨10.1017/jfm.2020.398⟩. ⟨hal-03345254⟩
  • Jean-Lou Pierson, Jacques Magnaudet, Edson Soares, Stéphane Popinet. Revisiting the Taylor-Culick approximation: Retraction of an axisymmetric filament. Physical Review Fluids, 2020, 5 (7), pp.073602. ⟨10.1103/PhysRevFluids.5.073602⟩. ⟨hal-02747137⟩
  • Pengyu Shi, Roland Rzehak, Dirk Lucas, Jacques Magnaudet. Hydrodynamic forces on a clean spherical bubble translating in a wall-bounded linear shear flow. Physical Review Fluids, 2020, 5 (7), pp.073601. ⟨10.1103/PhysRevFluids.5.073601⟩. ⟨hal-02933780⟩
  • Jacques Magnaudet, Matthieu Mercier. Particles, Drops, and Bubbles Moving Across Sharp Interfaces and Stratified Layers. Annual Review of Fluid Mechanics, 2020, 52 (1), pp.61-91. ⟨10.1146/annurev-fluid-010719-⟩. ⟨hal-02383288⟩
  • Qing Li, Micheline Abbas, Jeffrey F. Morris, Eric Climent, Jacques Magnaudet. Near-wall dynamics of a neutrally buoyant spherical particle in an axisymmetric stagnation point flow. Journal of Fluid Mechanics, 2020, 892, pp.A32. ⟨10.1017/jfm.2020.185⟩. ⟨hal-02735362⟩
  • Giuseppe A Zampogna, Sahrish B Naqvi, Jacques Magnaudet, Alessandro Bottaro. Compliant riblets: Problem formulation and effective macrostructural properties. Journal of Fluids and Structures, 2019, 91, pp.102708. ⟨10.1016/j.jfluidstructs.2019.102708⟩. ⟨hal-02383276⟩
  • Jie Zhang, Matthieu Mercier, Jacques Magnaudet. Core mechanisms of drag enhancement on bodies settling in a stratified fluid. Journal of Fluid Mechanics, 2019, 875, pp.622-656. ⟨10.1017/jfm.2019.524⟩. ⟨hal-02194243⟩
  • Samuel Mer, Olivier Praud, Jacques Magnaudet, Véronique Roig. Emptying of a bottle: How a robust pressure-driven oscillator coexists with complex two-phase flow dynamics. International Journal of Multiphase Flow, 2019, 118, pp.23-36. ⟨10.1016/j.ijmultiphaseflow.2019.05.012⟩. ⟨hal-02152629⟩
  • Fabien Candelier, Bernhard Mehlig, Jacques Magnaudet. Time-dependent lift and drag on a rigid body in a viscous steady linear flow. Journal of Fluid Mechanics, 2019, 864, pp.554-595. ⟨10.1017/jfm.2019.23⟩. ⟨hal-02052051⟩
  • Giuseppe Antonio Zampogna, Jacques Magnaudet, Alessandro Bottaro. Generalized slip condition over rough surfaces. Journal of Fluid Mechanics, 2019, 858, pp.407-436. ⟨10.1017/jfm.2018.780⟩. ⟨hal-01924709⟩
  • Franck Auguste, Jacques Magnaudet. Path oscillations and enhanced drag of light rising spheres. Journal of Fluid Mechanics, 2018, vol. 841, pp. 228-266. ⟨10.1017/jfm.2018.100⟩. ⟨hal-01715490⟩
  • Jean-Lou Pierson, Jacques Magnaudet. Inertial settling of a sphere through an interface. Part 2. Sphere and tail dynamics. Journal of Fluid Mechanics, 2018, vol. 835, pp. 808-851. ⟨10.1017/jfm.2017.748⟩. ⟨hal-01660645⟩
  • Florian Wodlei, Julien Sebilleau, Jacques Magnaudet, Véronique Pimienta. Marangoni-driven flower-like patterning of an evaporating drop spreading on a liquid surface. Nature Communications, 2018, 9, pp.820. ⟨10.1038/s41467-018-03201-3⟩. ⟨hal-01717626⟩
  • Samuel Mer, Olivier Praud, Hervé Neau, Nicolas Merigoux, Jacques Magnaudet, et al.. The emptying of a bottle as a test case for assessing interfacial momentum exchange models for Euler–Euler simulations of multi-scale gas-liquid flows. International Journal of Multiphase Flow, 2018, vol. 106, pp. 109-124. ⟨10.1016/j.ijmultiphaseflow.2018.05.002⟩. ⟨hal-01801495⟩
  • Jean-Lou Pierson, Jacques Magnaudet. Inertial settling of a sphere through an interface. Part 1. From sphere flotation to wake fragmentation. Journal of Fluid Mechanics, 2018, vol. 835, pp. 762-807. ⟨10.1017/jfm.2017.747⟩. ⟨hal-01660835⟩
  • José Carlos Cano-Lozano, Carlos Martinez-Bazan, Jacques Magnaudet, Joël Tchoufag. Paths and wakes of deformable nearly spheroidal rising bubbles close to the transition to path instability. Physical Review Fluids, 2016, 1 (5), pp.053604. ⟨10.1103/PhysRevFluids.1.053604⟩. ⟨hal-01379970⟩
  • José Carlos Cano-Lozano, Joël Tchoufag, Jacques Magnaudet, Carlo Martínez-Bazán. A global stability approach to wake and path instabilities of nearly oblate spheroidal rising bubbles. Physics of Fluids, 2016, vol. 28 (n° 1), pp. 014102. ⟨10.1063/1.4939703⟩. ⟨hal-01330745⟩
  • Joël Tchoufag, David Fabre, Jacques Magnaudet. Weakly Nonlinear Model with Exact Coefficients for the Fluttering and Spiraling Motion of Buoyancy-Driven Bodies. Physical Review Letters, 2015, vol. 115 (n° 11), pp. 1-5. ⟨10.1103/PhysRevLett.115.114501⟩. ⟨hal-01196195⟩
  • Yannick Hallez, Jacques Magnaudet. Buoyancy-induced turbulence in a tilted pipe. Journal of Fluid Mechanics, 2015, vol. 762, pp. 435-477. ⟨10.1017/jfm.2014.638⟩. ⟨hal-01102240⟩
  • Joël Tchoufag, David Fabre, Jacques Magnaudet. Global linear stability analysis of the wake and path of buoyancy-driven disks and thin cylinders. Journal of Fluid Mechanics, 2014, vol. 740, pp. 278-311. ⟨10.1017/jfm.2013.642⟩. ⟨hal-00958683⟩
  • Joël Tchoufag, Jacques Magnaudet, David Fabre. Linear instability of the path of a freely rising spheroidal bubble. Journal of Fluid Mechanics, 2014, vol. 751, pp. 754 R4-1 1. ⟨10.1017/jfm.2014.340⟩. ⟨hal-01015463⟩
  • Joël Tchoufag, Jacques Magnaudet, David Fabre. Linear stability and sensitivity of the flow past a fixed oblate spheroidal bubble. Physics of Fluids, 2013, vol. 25, ⟨10.1063/1.4804552⟩. ⟨hal-00874779⟩
  • Franck Auguste, Jacques Magnaudet, David Fabre. Falling styles of disks. Journal of Fluid Mechanics, 2013, vol. 719, pp.388-405. ⟨10.1017/jfm.2012.602⟩. ⟨hal-00908124⟩
  • Romain Bonhomme, Jacques Magnaudet, Fabien Duval, Bruno Piar. Inertial dynamics of air bubbles crossing a horizontal fluid-fluid interface. Journal of Fluid Mechanics, 2012, vol. 707, pp. 405-443. ⟨10.1017/jfm.2012.288⟩. ⟨hal-00908876⟩
  • David Fabre, Joël Tchoufag, Jacques Magnaudet. The steady oblique path of buoyancy-driven disks and spheres. Journal of Fluid Mechanics, 2012, vol. 707, pp. 24-36. ⟨10.1017/jfm.2012.231⟩. ⟨hal-00877022⟩
  • Pauline Assemat, David Fabre, Jacques Magnaudet. The onset of unsteadiness of two-dimensional bodies falling or rising freely in a viscous fluid: a linear study. Journal of Fluid Mechanics, 2012, vol. 690, pp. 173-202. ⟨10.1017/jfm.2011.419⟩. ⟨hal-00908868⟩
  • Patricia Ern, Frederic Risso, David Fabre, Jacques Magnaudet. Wake-induced oscillatory paths of bodies freely rising or falling in fluids. Annual Review of Fluid Mechanics, 2012, 44 (1), pp.97-121. ⟨10.1146/annurev-fluid-120710-101250⟩. ⟨hal-03468415⟩
  • Mélanie Le Roux, Jacques Magnaudet. Simulation of neutrophil motion and deformation: influence of rheology and flow configuration. Computer Methods in Biomechanics and Biomedical Engineering, 2011, vol. 14, pp. 107-109. ⟨10.1080/10255842.2011.592377⟩. ⟨hal-00908036⟩
  • Romain Bonhomme, Jacques Magnaudet, Bruno Piar. Dynamique de bulles traversant l'interface séparant deux liquides. Mechanics & Industry, 2011, vol. 12, pp. 163-168. ⟨10.1051/meca/2011108⟩. ⟨hal-00912372⟩
  • David Fabre, Pauline Assemat, Jacques Magnaudet. A quasi-static approach to the stability of the path of heavy bodies falling within a viscous fluid. Journal of Fluids and Structures, 2011, vol. 27, pp. 758-767. ⟨10.1016/j.jfluidstructs.2011.03.013⟩. ⟨hal-00908806⟩
  • Jacques Magnaudet. A 'reciprocal' theorem for the prediction of loads on a body moving in an inhomogeneous flow at arbitrary Reynolds number - CORRIGENDUM. Journal of Fluid Mechanics, 2011, vol. 689, pp.605-606. ⟨10.1017/jfm.2011.475⟩. ⟨hal-00908114⟩
  • Jacques Magnaudet. A 'reciprocal' theorem for the prediction of loads on a body moving in an inhomogeneous flow at arbitrary Reynolds number. Journal of Fluid Mechanics, 2011, vol. 689, pp.564-604. ⟨10.1017/jfm.2011.363⟩. ⟨hal-00907975⟩
  • Franck Auguste, David Fabre, Jacques Magnaudet. Bifurcations in the wake of a thick circular disk. Theoretical and Computational Fluid Dynamics, 2010, vol. 24, pp. 305-313. ⟨10.1007/s00162-009-0144-3⟩. ⟨hal-00877297⟩
  • Thomas Bonometti, S. Balachandar, Jacques Magnaudet. Wall effects in non-Boussinesq density currents. Journal of Fluid Mechanics, 2008, vol. 616, pp. 445-475. ⟨10.1017/S002211200800414X⟩. ⟨hal-00862825⟩
  • David Fabre, Franck Auguste, Jacques Magnaudet. Bifurcations and symmetry breaking in the wake of axisymmetric bodies. Physics of Fluids, 2008, vol. 20, pp. 1-4. ⟨10.1063/1.2909609⟩. ⟨hal-00874366⟩
  • Thomas Bonometti, Jacques Magnaudet, Pascal Gardin. On the dispersion of solid particles in a liquid agitated by a bubble swarm. Metallurgical and Materials Transactions B, 2007, vol. 38B, pp. 739-750. ⟨10.1007/s11663-007-9085-7⟩. ⟨hal-00862695⟩
  • Thomas Bonometti, Jacques Magnaudet. An interface-capturing method for incompressible two-phase flows. Validation and application to bubble dynamics. International Journal of Multiphase Flow, 2007, vol. 33, pp. 109-133. ⟨10.1016/j.ijmultiphaseflow.2006.07.003⟩. ⟨hal-00862680⟩
  • S.G. Monismith, E.A. Cowen, H.M. Nepf, Jacques Magnaudet, Laurent Thais. Laboratory observations of mean flows under surface gravity waves. Journal of Fluid Mechanics, 2007, 573, pp.131-147. ⟨10.1017/S0022112006003594⟩. ⟨hal-00147558⟩
  • François Caillé, Christophe Clanet, Jacques Magnaudet. Bubble capture by a propeller. Journal of Fluid Mechanics, 2006, 560, pp.311. ⟨10.1017/S0022112006000747⟩. ⟨hal-02357011⟩
  • Thomas Bonometti, Jacques Magnaudet. Transition from spherical cap to toroidal bubbles. Physics of Fluids, 2006, vol. 18, pp. 1-12. ⟨10.1063/1.2196451⟩. ⟨hal-00862651⟩
  • Flavie Sarrazin, Thomas Bonometti, Karine Loubière, Laurent Prat, Christophe Gourdon, et al.. Experimental and numerical study of droplets hydrodynamics in microchannels. AIChE Journal, 2006, 5 (12), pp.4061-4070. ⟨10.1002/aic.11033⟩. ⟨hal-03598005⟩

Communications dans un congrès

  • David Fabre, Joël Tchoufag, Kemal Selvam, Jacques Magnaudet. Path instabilities of heavy bodies in free fall in a viscous fluid: wake dynamics vs. aerodynamic effects. 66th APS DFD Annual Meeting, Nov 2013, Pittsburg, Etats-Unis, United States. ⟨hal-04481514⟩
  • Alice Lieu, Franck Auguste, Jacques Magnaudet. The rich life of light rising spheres. 66th APS DFD Annual Meeting, Nov 2013, Pittsburg, Etats-Unis, United States. ⟨hal-04481492⟩
  • Jacques Magnaudet. The hard life of air bubbles crossing a fluid/fluid interface. Complex Fluids & Flows in industry & nature II, Jul 2013, Vancouver (Canada), Canada. ⟨hal-04481446⟩
  • Joël Tchoufag, David Fabre, Jacques Magnaudet. Weakly nonlinear analysis of the flutter motion of thin cylinders. Ercoftac International Symposium on Unsteady separation in Fluid-Structure Interaction, Jun 2013, Mykonos, Greece. ⟨hal-00918002⟩
  • Joël Tchoufag, David Fabre, Jacques Magnaudet. Linear stability of disks falling or rising freely in a viscous fluid. 9th Euromech Fluid Mechanics Conference, Sep 2012, Rome, Italy. ⟨hal-00918006⟩
  • Franck Auguste, David Fabre, Jacques Magnaudet. Ecoulement d'un fluide visqueux autour d'un disque en incidence frontale. CFM 2007 - 18ème Congrès Français de Mécanique, Aug 2007, Grenoble, France. ⟨hal-03362031⟩
  • Saturnin Richard Adoua, Dominique Legendre, Jacques Magnaudet. Forces et couple sur une bulle ellipsoïdale plongée dans un écoulement cisaillé. CFM 2007 - 18ème Congrès Français de Mécanique, Aug 2007, Grenoble, France. ⟨hal-03362123⟩
  • Xavier Silvani, Jacques Magnaudet. Large eddy simulations of Rayleigh-Taylor turbulence. 5th International Symposium on Turbulence, Heat and Mass Transfer, Sep 2006, Dubrovnik, Croatia. pp.117. ⟨hal-00189734⟩

Pré-publications, Documents de travail

  • Paul Bonnefis, Javier Sierra Ausin, David Fabre, Jacques Magnaudet. Path instability of deformable bubbles rising in Newtonian liquids: A linear study. 2023. ⟨hal-04268828⟩