Jacques Magnaudet
| Professor Jacques Magnaudet | |
|---|---|
| Born | Jacques Magnaudet 22 March 1959 |
| Error: Need valid death date (first date): year, month, dayError: Need valid death date (first date): year, month, day | |
| 🎓 Alma mater | |
| 💼 Occupation | |
| Known for | Fluid Dynamics |
| Title | Professor, Institut de Mécanique des Fluides de Toulouse |
| 🏅 Awards |
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Jacques Magnaudet (born 22 March 1959) is a French scientist specializing in fluid dynamics. He is a research director at CNRS, currently working at the Institut de Mécanique des Fluides de Toulouse (Institute of Fluid Mechanics of Toulouse, abbreviation IMFT).[4] He is known for his contributions to multiphase flows, in particular the dynamics of particles, drops and bubbles and the physics of turbulent exchanges at fluid interfaces.[5][6]
Career
Magnaudet graduated from Ecole Centrale de Paris (now CentraleSupélec) and holds a DEA (post-graduate diploma) in theoretical and applied mechanics from University Paris 6 (now Sorbonne University). He joined CNRS in 1989 after completing his Ph.D. in Toulouse.[7] He has been associate editor of the Journal of Fluid Mechanics since 2010[8] and served as secretary general of the European Mechanics Society (EUROMECH) from 2019 to 2024.[9] Since November 1, 2024, he has been president of the International Union of Theoretical and Applied Mechanics (IUTAM).[10] He has taught hydrodynamics and turbulence in various curricula and summer schools, and was a part-time associate professor at Ecole Polytechnique from 1997 to 2002.
Research
Magnaudet's research aims at understanding, through physical analysis (often based on numerical experimentation) and at predicting, by elaborating low-order mathematical models, the motion and exchange of mass or heat in flows involving several fluids separated by deformable interfaces, or in those where rigid or deformable objects (particles, drops, bubbles, biological cells) move and interact within a fluid. To this end, he occasionally develops dedicated mathematical formulations[11] and computational techniques[12]. The classes of flows he deals with span a wide range of regimes and physical effects and have direct applications in many fields, both in engineering and geophysics.
- Based on laboratory experiments and large eddy simulations, he described the statistical structure of turbulent motions beneath a free surface[13][14], and their interaction with wind-generated surface waves.[15] In particular, his work has helped refine the laws governing the exchange of weakly soluble gases across a free surface subjected to turbulence and wind, which are needed, for example, to predict the amount of CO2 captured by the oceans. He also explored the properties of turbulent motions and mixing in buoyancy-driven flows in confined geometries,[16] with applications to volcanic eruptions, oil recovery and inertially confined fusion.
- He has made extensive use of fully resolved simulations, asymptotic approaches and scaling law analyses to determine the hydrodynamic forces and torques experienced by rigid particles, drops and bubbles in a wide variety of configurations. In particular, he considered generic situations where such objects are immersed in canonical time-dependent or nonuniform flows,[17] experience volume variations driven by phase change or acoustic excitation,[18] interact with each other[19] or with walls,[20][21] collectively generate periodic flow patterns[22] or are subjected to forcings such as density stratification[23] or rigid-body rotation of the carrying fluid. He also carried out specific studies on the influence of surfactants on the motion of rising bubbles and the morphodynamics of spreading drops.[24] His work has led to models implemented in numerous simulation codes used to predict the distribution of particles, drops and bubbles in flows encountered in fields as diverse as nuclear engineering, ocean pollution, steelmaking and microfluidics.
- By combining numerical simulations,[25] global stability analyses[26] and laboratory experiments[27] conducted with various collaborators, he has explored the mechanisms governing the coupled path and wake instabilities of rigid and deformable objects moving freely under the effect of an external force (such as the fluttering and tumbling of coins falling in a fountain). In particular, he explained why millimeter-sized air bubbles rising in low-viscosity liquids, such as water, follow helical or zigzag trajectories rather than straight vertical paths[28][29][30] – a paradoxical phenomenon that already puzzled Leonardo da Vinci five centuries ago.
References
- ↑ https://www.academie-sciences.fr/pdf/documentation/prix2014/files/assets/common/downloads/Les%20acad.pdf
- ↑ "Falling/Rising styles of gravity/Buoyancy-driven disks | ICTS".
- ↑ https://www.ictam2024.org/index.php?GP=pro/pro03
- ↑ https://cv.hal.science/jacques-magnaudet
- ↑ "Fluid Mechanics Fellows – Euromech".
- ↑ "Honors and Award Winners".
- ↑ "File shared on Smallpdf".
- ↑ "Editorial board".
- ↑ https://euromech.org/docs/Toulouse-officers-meeting-2023/4_council-members-2022
- ↑ "Membership of IUTAM – IUTAM".
- ↑ J. Magnaudet, A 'reciprocal' theorem for the prediction of loads on a body moving in an inhomogeneous flow at arbitrary Reynolds number. J. Fluid Mech. 689, 564-604 (2011).
- ↑ G. Mougin and J. Magnaudet, The generalized Kirchhoff equations and their application to the interaction of a rigid body with an arbitrary time-dependent viscous flow. Int. J. Multiphase Flow 28, 1837-1851 (2002).
- ↑ I. Calmet and J. Magnaudet, Statistical structure of high-Reynolds-number turbulence close to the free surface of an open channel. J. Fluid Mech. 474, 355 – 378 (2003).
- ↑ J. Magnaudet, High-Reynolds-number turbulence in a shear-free boundary layer: revising the Hunt-Graham theory. J. Fluid Mech. 484, 167-196 (2003).
- ↑ L. Thais and J. Magnaudet, Turbulent structure below surface gravity waves sheared by the wind. J. Fluid Mech. 328, 313-344 (1996).
- ↑ Y. Hallez and J. Magnaudet, Effect of channel geometry on buoyancy-driven mixing. Phys. Fluids 20, 053306 (2008).
- ↑ J. Magnaudet and I. Eames, The motion of high-Reynolds-number bubbles in inhomogeneous flows. Annu. Rev. Fluid Mech. 32, 659-708 (2000).
- ↑ J. Magnaudet and D. Legendre, The viscous drag force on a spherical bubble with a time-dependent radius. Phys. Fluids 10, 550-554 (1998).
- ↑ J. Zhang et al., Three-dimensional dynamics of a pair of deformable bubbles rising initially in line. Part 1: Moderately inertial regimes. J. Fluid Mech. 920, A16 (2021).
- ↑ J. Magnaudet et al., Drag, deformation and lateral migration of a buoyant drop moving near a wall. J. Fluid Mech. 476, 115-157 (2003).
- ↑ P. Shi et al., Drag and lift forces on a rigid sphere immersed in a wall-bounded linear shear flow. Phys. Rev. Fluids 6, 104309 (2021).
- ↑ E. Climent and J. Magnaudet, Large-scale simulations of bubble-induced convection. Phys. Rev. Lett. 82, 4827-4830 (1999).
- ↑ J. Magnaudet and M.J. Mercier, Particles, drops and bubbles moving across sharp interfaces and stratified layers. Annu. Rev. Fluid Mech. 52, 61-91 (2020).
- ↑ F. Wodlei et al., Marangoni-driven flower-like patterning of an evaporating drop spreading on a liquid substrate. Nat. Commun. 9, 820 (2018).
- ↑ F. Auguste et al., Falling styles of disks. J. Fluid Mech. 719, 388-405 (2013).
- ↑ J. Tchoufag et al., Global linear stability analysis of the wake and path of buoyancy-driven disks and thin cylinders. J. Fluid Mech. 740, 278-311 (2014).
- ↑ P. Ern et al., Wake-induced oscillatory paths of bodies freely rising or falling in fluids. Annu. Rev. Fluid Mech. 44, 97-121 (2012).
- ↑ G. Mougin and J. Magnaudet, Path instability of a rising bubble. Phys. Rev. Lett. 88, 014502 (2002).
- ↑ P. Bonnefis et al., When, how and why the path of an air bubble rising in pure water becomes unstable. Proc. Natl. Acad. Sci. U. S. A. 120, e2300897120 (2023).
- ↑ P. Bonnefis et al., Path instability of deformable bubbles rising in Newtonian liquids: A linear study. J. Fluid Mech. 980, A19 (2024).
External links
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