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PMMH’s weekly seminar is held every Friday at 11 am (map)
Sylvain Patinet
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH - Ko Okumura (Ochanomizu University, Tokyo)
A hydrodynamic analog of critical phenomena : an uncountably infinite number of universality classes
When a solid object starts falling into a viscous fluid from air-liquid interface, air is entrained into the liquid and eventually detaches from the solid. Such detachment could occur with or without topological change. Recently, it was found that the former case (i.e., breakup, a form of singular transitions) is observed in a confined geometry but the topology change is suppressed in a more confined geometry, by falling a metal disk in a vertically stood Hele-Shaw cell filled with a viscous liquid with the disk axis perpendicular to the direction of gravity. In this talk, we discuss the results when we tune a confinement parameter, the thickness difference between the cell and the disk, with fixing another confinement parameter, the disk thickness. As a result, we find that the present hydrodynamic case possesses a strikingly close analogy with critical phenomena. Critical phenomena have widely been observed in nature, and the concept of universality class, which has emerged from our understanding of critical phenomena, has guided the recent development of physics. Accordingly, identifying a rich variety of universality class is a major issue in modern physics. Here, we remarkably find the present hydrodynamic analog of critical phenomena reveals the existence of an uncountably infinite number of universality classes, by showing critical exponents that define a universality class depend on continuous numbers characterizing the confinement.
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Seminars (7)
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Séminaire PMMH - Ludovic Berthier, Gulliver
Vendredi 24 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
Emerging active turbulence and chaotic advection in dense active matter
I will show that active mesoscale flows, a.k.a. active turbulence, leading to chaotic advection generically emerge in simple models of active particles leading to streams and vortices reminiscent of multiscale flow patterns in turbulence. The characteristics of these flows do not depend on the specific details of (...) -
Séminaire PMMH - Ludovic Berthier, Gulliver
Vendredi 24 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
Emerging active turbulence and chaotic advection in dense active matter
I will show that active mesoscale flows, a.k.a. active turbulence, leading to chaotic advection generically emerge in simple models of active particles leading to streams and vortices reminiscent of multiscale flow patterns in turbulence. The characteristics of these flows do not depend on the specific details of (...) -
Séminaire PMMH - Elisabeth Lemaire (INPHYNI, Nice)
Vendredi 31 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH - Elisabeth Lemaire (INPHYNI, Nice)
Vendredi 31 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
Origins of shear-thinning in non-Brownian suspensions
The rheology of concentrated non-Brownian suspensions has undergone a small revolution in the last 15 years when the importance of the role played by solid contacts between particles was realized. Considering these contacts has allowed to explain the continuous or discontinuous shear-thickening in dense (...) -
Séminaire PMMH - Chandan Bose (Univ. Birmingham)
Vendredi 7 février de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH - Christophe Denoual, CEA
Vendredi 14 février 2025 de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH - Christophe Denoual, CEA
Vendredi 14 février de 11h00 à 12h00 - Salle réunion PMMH 1
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
