ESPCI web site
Séminaires
Le séminaire hebdomadaire du laboratoire PMMH a lieu tous les vendredis à 11h, au premier étage Barre Cassan, campus Jussieu (plan).
Alice Pelosse
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.
Séminaires (2)
-
Séminaire PMMH - Ada Altieri (MSC, Paris)
Vendredi 20 novembre de 11h00 à 12h00 - Salle réunion PMMH 1
From disordered Generalized Lotka-Volterra models to gut microbiome complexity
Inferring species interactions in highly heterogeneous ecological communities and developing a robust, predictive theory of ecological stability remain major challenges, due both to the amount of data required and the complexity of the underlying interaction network. In this talk, I will present a high-dimensional (…) -
Séminaire PMMH — Benjamin Apffel (ENS Lyon)
Vendredi 8 janvier 2027 de 11h00 à 12h00 - Salle réunion PMMH 1
Computing with Frustrated Space-Time Metamaterials
Space-time metamaterials are engineered media whose constitutive parameters are modulated simultaneously in both space and time. They are now used to achieve unprecedented wave control. However, the vast majority of studies operate in the stable regime, where modulation parameters are chosen to ensure linear wave (…)
Instructions générales pour les conférenciers
Le public du séminaire est très hétérogène (rien qu’au PMMH nous travaillons sur des thématiques très diverses, mécanique des fluides, des milieux granulaires, des solides, physique statistique, physique du mouillage, micro-fluidique, biophysique,...) l’objectif est donc de ne pas faire un séminaire trop spécialiste : au moins la première moitié du séminaire à un niveau accessible pour celui qui ne connaît rien sur le sujet.
Le séminaire a lieu à 11h. rendez-vous 15 minutes avant pour installer et tester la projection.
Le séminaire dure environ 45 minutes pour laisser un peu de temps pour discuter à la fin.
- 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
Soutenances de thèse
Auriane Huyghues-Despointes : 22/09 - 14h30
Sébastien Kuchly : 23/09 - 14h
Juliette Michaud : 28/09 - 14h
Diane Komaroff : 02/10 - 14h
Marc Vacher : 13/10
Jules Tampier : 16/10 - 13h30
Alex Le Guen : 01/12 - 14h
Elias Lundheim : 07/12 - 9H
Séminaires café (internes, tous les jeudis)
Lien
