Séminaires PMMH

Séminaire PMMH - Site Jussieu

Contact :
Benoit Semin
Sylvain Patinet
Etienne Reyssat
responsables-seminaires (arobase) pmmh.espci.fr

PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France

Tel : (33) 1 40 79 45 22

Comment venir ?

7 quai Saint Bernard, 75005 PARIS

Le séminaire hebdomadaire du laboratoire PMMH a lieu tous les vendredis à 11h, au premier étage Barre Cassan, campus Jussieu.


Séminaire PMMH- Elisabeth Guazzelli (MSC)

Vendredi 7 février 2020 11:00-12:00 - Salle réunion PMMH 1

Particle motion in vortical flows

In many natural phenomena or industrial applications, heavy particles are transported in complex flows. The flow structures may happen to promote the stirring and dispersion of the particles. But the opposite can also take place and the flow configuration may contribute to the focussing and accumulation of particles within specific regions of the flow. A typical example in the natural environment is the observed patchiness of plankton concentration caused by wind-induced Langmuir cells occurring at the surface of lakes and oceans. The objective of this work is to examine the interactions of particles with local spatial structures of the flow, i.e. large vortices. We first consider the settling of particles under the action of gravity in a cellular flow field which is a simple model flow capturing key features of vortical effects on the particles. The experiment uses electroconvection to generate a two-dimensional array of controlled vortices. Experimental observations are compared to the predictions of point-particle simulations. We examine the motion of single particles (spheres and also anisotropic particles such as fibers) but also of clouds of particles to address the interplay between the multibody particle interactions and the interaction between the particles and the spatial structures of the flow. We finally consider the interactions of particles with wakes and recirculating flows around obstacles in a channel and are particularly interested in the understanding of the particle exchange between the recirculating flow regions and the free stream.

This work has been undertaken in Laboratoire IUSTI, Aix Marseille Université, CNRS, in collaboration with O. Ait Oucheggou, L. Bergougnoux, G. Bouchet, D. Lopez, B. Marchetti. The work on `Particle-laden flow around an obstacle in a pipe' is in collaboration with V. Pointeau and G. Ricciardi, CEA Cadarache.

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Séminaires  (4)

  • Séminaire PMMH - Jérôme Fresnais (PHENIX, UPMC)
    Vendredi 15 novembre 11:00-12:00 - Salle réunion PMMH 1
    Making superhydrophobic surfaces with magnetic elastomer : towards controlled droplet movement
    In the field of superhydrophobic surfaces, natural surfaces exhibiting non-wetting filament networks remain a challenge to understand. Indeed, if classical superhydrophobic surfaces developed roughness at different scales, superhydrophobicity on hairy surfaces shows elastic behavior that is more difficult to (...)
  • Séminaire PMMH — Miguel Fernandez (équipe-projet Commedia, INRIA Paris)
    Vendredi 22 novembre 11:00-12:00 - Salle réunion PMMH 1
    Numerical methods for fluid-structure interaction with immersed elastic bodies
  • Séminaire PMMH, Vinod Kumar Saranathan (Yale NUS College)
    Vendredi 6 décembre 11:00-12:00 - Salle réunion PMMH 1
    Biomimetic and Bio-inspired Potential of Self-assembled Biophotonic Nanostructures
    Colors in Nature can be produced either chemically, by the selective light bsorption by pigments, or physically, by light interference from biophotonic nanostructures. Intriguingly, there are almost no known violet, blue or green pigments in animals. And yet these structurally produced colors are ubiquitous in (...)
  • Séminaire PMMH - Jean-Philippe Bouchaud
    Vendredi 20 décembre 11:00-12:00 - Salle réunion PMMH 1
    Physique et modélisation de l'économie

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.

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Informations Pratiques

Laboratoire : 01 40 79 45 22
Directeur : Damien Vandembroucq
Codirecteur : Philippe Petitjeans
Administratrice : Frédérique Auger (01 40 79 45 22)
Gestionnaire : Claudette Barez (01 40 79 58 53)
Courriel : dir (arobase) pmmh.espci.fr

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