Séminaires

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

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


Séminaire PMMH- Pedro Saenz (University of North Carolina at Chapel Hill)

Vendredi 25 octobre 2019 11:00-12:00 - Salle réunion PMMH 1

Hydrodynamic Spin Lattices

Mesoscale and macroscale analogs of electronic spin systems, such as ultra-cold fermionic lattice gases and mechanical metamaterials, offer direct insights into fundamental physical prin ciples while simultaneously promising groundbreaking applications, from quantum computation and simulators to photonic and phononic band gap materials. In this talk, we introduce hydrodynamic spin lattices (HSLs) of walking droplets as a new class of highly tunable active spin analog systems. Millimetric liquid droplets can walk across the surface of a vibrating fluid bath, self-propelled through a resonant interaction with their own guiding wave fields. A walking droplet, or ‘walker', may be trapped by a submerged circular well at the bottom of the fluid bath, leading to a clockwise or counterclockwise angular motion centered at the well. When a collection of such wells is arranged in a 1D or 2D lattice geometry, a thin fluid layer between wells enables wave-mediated interactions between neighboring walkers. Through experiments and mathematical modeling, we demonstrate the spontaneous emergence of coherent droplet rotation dynamics for different types of lattices. For sufficiently strong pair-coupling, wave interactions between neighboring droplets may induce local spin flips leading to ferromagnetic or antiferromagnetic order. Transitions between these two forms of magnetic order can be induced through variations in non-equilibrium driving, lattice geometry and Coriolis forces mimicking an external magnetic field. Our experimental results agree with theoretical predictions from a generalized Kuramoto model derived from first principles, establishing HSLs as a generic paradigm for active phase oscillator dynamics with complex particle-wave coupling.

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Archives des anciens séminaires  (74)

  • 2020

    • Séminaire PMMH - Lorraine Montel (UPMC)
      Vendredi 11 décembre 2020 11:00-12:00 - Salle réunion PMMH 1
      Emulsion droplets as a model biomimetic system
      Emulsion droplets recapitulate the deformability and surface fluidity of biological objects, in a simpler and tunable fashion. Thus, they can be used as a model biomimetic system to study cell-cell interactions. During this talk, I will demonstrate this use in two different systems : the study of phagocytosis, and (...)
    • Séminaire PMMH - A.M. Goryaeva (Université de Rouen)
      Vendredi 27 novembre 2020 11:00-12:00 - Salle réunion PMMH 1
      Reinforcing materials modelling by encoding the structures of defects in crystalline solids into distortion scores
      A perfect crystal is a purely theoretical concept. Real-world crystals contain imperfections, also called defects. Identification and characterization of defects provide the crucial information for interpretation of simulations and experiments that bridge the gap between atomic- and micrometer-scales. But what is (...)
    • Séminaire PMMH - Joseph d'Alessandro
      Vendredi 13 novembre 2020 11:00-12:00 - Salle réunion PMMH 1

      Eukaryotic cells as interacting living particles

      Cells move. They propel themselves using an internal machinery which endows them with the characteristics of active particles. At the same time, they interact dynamically with their (...)
      Eukaryotic cells as interacting living particles
      Cells move. They propel themselves using an internal machinery which endows them with the characteristics of active particles. At the same time, they interact dynamically with their environment and with neigbouring cells, by adhering, exerting forces and exchanging biochemical signals. In this talk, we will first (...)

    • Séminaire PMMH - Costantino Creton (SIMM ESPCI)
      Vendredi 6 novembre 2020 11:00-12:00 - Salle réunion PMMH 1
      Using light to detect molecular forces, chemical bond scission and to understand fracture
      Costantino Creton Soft Matter Science and Engineering, ESPCI Paris, Université PSL, Paris, F Recent advances in chemistry have made it possible to directly optically visualize forces on chemical bonds or even bond scission by using molecules that either emit light or become fluorescent when activated by the (...)
    • Séminaire PMMH-Cécile Sykes (Institut Curie, Paris)
      Vendredi 27 mars 2020 11:00-12:00 - Salle réunion PMMH 1
      Active or passive deformation of the cell membrane supplied by actin assembly. Perpectives on nucleus deformation
      In all cell functions, a common observation is that cytoskeleton assembly correlates with membrane deformation based on active forces. The exact role, in particular, of the actin cytoskeleton in cell membrane deformation, with pushing or pulling forces, is what we address both experimentally and theoretically. We (...)
    • Séminaire PMMH - Chung-Yuen Hui (Cornell University)
      Vendredi 13 mars 2020 11:00-12:00 - Salle réunion PMMH 1
      Mechanical Properties of Fiber-Reinforced Soft Composites
      In this talk I will focus on an emerging class of fiber reinforced composites where the matrix is extremely soft and tough. For example, an upper estimate for fiber/matrix modulus ratio in traditional fiber reinforced polymer composites is at most 100. Matrices made from tough elastic gels can have modulus (...)
    • Séminaire PMMH, Arthur Lebée ENPC
      Vendredi 6 mars 2020 11:00-12:00 - Salle réunion PMMH 1
      Continuum elasticity of Miura Tessellations
      Origami tessellations are curved two-dimensional discrete shells folded out of a periodic crease pattern. Unlike solid shells, Origami tessellations can morph and access a space of configurations each characterized by the list of folding angles of all creases. Due to inextensibility constraints imposed by Origami (...)
    • Séminaire PMMH- Paulo E. Arratia (UPenn)
      Vendredi 28 février 2020 11:00-12:00 - Salle réunion PMMH 1
      A microstructural view of yielding and plasticity in 2D disordered materials
      When stressed sufficiently, amorphous materials yield and deform plastically via reorganization of microscopic constituents. Despite much effort, understanding the interdependence of yielding, plasticity, and microscopic structure in non-equilibrium states (i.e. under stress) remains a major challenge. In this (...)
    • 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 (...)
    • Séminaire PMMH- Dwight Barkley (University of Warwick)
      Vendredi 31 janvier 2020 11:00-12:00 - Salle réunion PMMH 1
      A fluid mechanic's analysis of the tea-cup singularity
      In 1926 Einstein published a short paper explaining the meandering of rivers. He famously began the paper by discussing the secondary flow generated in a stirred tea cup — the flow now widely known to be responsible for the collection of tea leaves at the center of a stirred cup of tea. In 2014, Luo and Hou (...)
    • Séminaire PMMH- Kristina Davitt (ENS)
      Vendredi 24 janvier 2020 11:00-12:00 - Salle réunion PMMH 1
      Wetting hysteresis and dynamics : interpreting dissipation mechanisms at the contact line
      A liquid moving over a solid substrate is an everyday occurrence, and the hysteresis and dynamics of the three-phase contact line have been measured in innumerable experiments over the years. In addition, the ingredients needed to describe the phenomenon are known : in the most basic picture, there is viscous (...)
    • Séminaire PMMH - Doron Grossman (Collège de France)
      Vendredi 17 janvier 2020 11:00-12:00 - Salle réunion PMMH 1
      From Molecules to Helical Ribbons - Shape and Shape Fluctuations
      * Self assembly of molecules into supramolecular structures is an important process through which non trivial structures are formed in nano-metric scale. The resulting structure depends on chemical and physical principles that govern the process, and may be sensitive to the exact conditions in which they are (...)
    • Séminaire PMMH Nicolas Triantafyllidis (LMS polytechnique)
      Vendredi 10 janvier 2020 11:00-12:00 - Salle réunion PMMH 1
      STABILITY PROBLEMS IN MECHANICS : MULTIPHYSICS AND MULTISCALE ASPECTS (A MECANICIAN'S PERSPECTIVE…)
      Stability is a fascinating topic in solid mechanics that has its roots in the celebrated Euler column buckling problem, which first appeared in 1744. Over the years advances in technology have led to the study of ever more complicated structures first in civil and subsequently in mechanical engineering applications. (...)
  • 2019

    • Séminaire PMMH - Jean-Philippe Bouchaud
      Vendredi 20 décembre 2019 11:00-12:00 - Salle réunion PMMH 1
      Crises et phénomènes socio-économiques collectifs
      Comme l'écrivait P. W. Anderson en 1972 dans « More is different », le comportement de grandes assemblées d'individus ne peut pas être compris à partir de l'extrapolation du comportement d'individus isolés. Au contraire, des comportements complètement nouveaux, parfois spectaculaires et difficiles à anticiper, peuvent (...)
    • Séminaire PMMH - Séverine Atis (Harvard University)
      Vendredi 13 décembre 2019 11:00-12:00 - Salle réunion PMMH 1
      On Growth and Form of Range Expansions at Liquid Interfaces
      Range expansions coupled with fluid flows are of great importance in understanding the organization and competition of microorganism populations in liquid environments. However, combining growth dynamics of an expanding assembly of cells with hydrodynamics leads to challenging problems, involving the coupling of (...)
    • Séminaire PMMH, Vinod Kumar Saranathan (Yale NUS College)
      Vendredi 6 décembre 2019 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 — Miguel Fernandez (équipe-projet Commedia, INRIA Paris)
      Vendredi 22 novembre 2019 11:00-12:00 - Salle réunion PMMH 1
      Numerical methods for fluid-structure interaction with immersed elastic bodies
      The mechanical interaction of an incompressible fluid flow with an elastic structure is a multi-physic problem omnipresent in nature and in many engineering fields. One can think, for instance, of the opening/closing dynamics of heart valves when blood is propelled into the arteries and of the wings of a bird (...)
    • Séminaire PMMH - Jérôme Fresnais (PHENIX, UPMC)
      Vendredi 15 novembre 2019 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 -Julien Bobroff (LPS, Univ. Paris-Sud/Paris-Saclay)
      Vendredi 8 novembre 2019 11:00-12:00 - Salle réunion PMMH 1
      La physique autrement
      Pourquoi vulgariser la physique autrement ? Et surtout comment ? Voilà les deux questions au coeur des activités de notre équipe de recherche. Nous y explorons de nouvelles formes de vulgarisation en lien avec le monde du design et de la création. Parmi nos dernières productions, un objet de médiation sur la (...)
    • Séminaire PMMH - Jean Comtet (EPFL)
      Vendredi 4 octobre 2019 11:00-12:00 - Salle réunion PMMH 1
      Soft matter and mechanics at the molecular scale : from the rheology of few-atoms gold junctions to the observation of single proton transport at solid/water interfaces.
      Jean Comtet École Polytechnique Fédérale de Lausanne, Département Sciences et Techniques de l'Ingénieur, CH-1015 Lausanne New paradigms are expected to emerge at the nanometer scale for soft matter and mechanics, stemming from the breakdown of continuum concepts and the appearance of new force scales. I will present (...)
    • Séminaire PMMH - Natsuhiko Yoshinaga (Tohoku University)
      Lundi 30 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
      Model Selection of PDE for Pattern Forming Systems
      Partial differential equations (PDE) have been widely used to reproduce patterns in nature, and to give an insight on the mechanism underlying pattern formation. Although enormous number of PDE models have been proposed, they rely on pre-request knowledge of physical laws and symmetries, and one has difficulties (...)
    • Séminaire PMMH-Arezki Boudaoud (ENS Lyon)
      Vendredi 27 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
      From tissue mechanics to plant morphogenesis
      The form of organisms relies on the mechanical properties of their cells and tissues. In order to help understanding how plants grow and reach well-defined shapes, we developed a set of experimental and theoretical approaches to quantify tissue mechanics in living plants at multiple scales and to relate such (...)
    • Séminaire PMMH - David Saintillan (University of California San Diego)
      Vendredi 20 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
      Viscous dynamics of passive and active microfilaments
      Elastic filaments and semiflexible polymers are ubiquitous in biology, where they play a role in cell mechanics and locomotion as well as for fluid transport on the microscale. In this talk, I will discuss two problems involving the interaction of such filaments with fluid flows. The first problem focuses on the (...)
    • Séminaire PMMH - Patrick Bot (Institut de Recherche de l'Ecole Navale)
      Vendredi 13 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
      From sails aerodynamics to the Lift Crisis (and other results on the lift generated by a highly curved plate)
      Yacht sails show some peculiarities among aerodynamic systems. Rather flat sails are used to sail upwind, and the flow remains mostly attached. To sail downwind, highly cambered sails may be used where flow separation is significant. Some results will be shown on the flow around a spinnaker and the related fluid (...)
    • Séminaire PMMH - Yukitaka Ishimoto (Akita Prefectural University)
      Vendredi 6 septembre 2019 11:00-12:00 - Salle réunion PMMH 1
      Biomechanical excursions : from cell shapes to dragonfly wings
      In the last decade, much attention has been paid to the physical/mechanical aspects of biological phenomena inside/outside living bodies, owing to the latest technological developments. For example, it becomes possible to directly measure the forces generated by cells on specially designed substrates, or to infer (...)
    • Seminaire Yahya Modarres-Sadeghi
      Lundi 26 août 2019 11:00-12:00 - Salle réunion PMMH 3
    • Séminaire PMMH - Farzam Zoueshtiagh (IEMN, Lille)
      Vendredi 5 juillet 2019 11:00-12:00 - Salle réunion PMMH 1
      Dynamics and stability of a liquid-gas interface in the presence of micro-particles
      This French-Japan-US collaborative study examines the influence of the micro-particles on the stability of the liquid-air interface. We will first revisit the effect of these particles on the dynamics of the interface in a confined "1D" geometry [1] with the formation of armored bubbles (fig. 1(a)) and will show (...)
    • Séminaire PMMH - Allbens Atman (Centro Federal de Educação Tecnológica de Minas Gerais, Brasil)
      Vendredi 28 juin 2019 11:00-12:00 - Salle réunion PMMH 1
      Experimental validation of nonextensive scaling law in confined granular media : emergence of shear bands
      The statistics of grain displacements probability distribution function (pdf) during the shear of a granular medium displays an unusual dependence with the shear increment upscaling as recently evinced [Phys. Rev. Lett. 115 238301 2015]. Basically, the pdf of grain displacements has clear nonextensive (q-Gaussian) (...)
    • Séminaire PMMH-Nicolas Vandewalle (Université de Liège)
      Vendredi 21 juin 2019 11:00-12:00 - Salle réunion PMMH 1
      Milliswimmers : Self-assembling complex and functional structures at the (sub)millimeter scale
      When soft ferromagnetic particles are suspended at air-water interfaces in the presence of a vertical magnetic field, dipole-dipole repulsion competes with capillary attraction such that structures self-assemble. The complex arrangements of such floating bodies are emphasized. By adding a horizontal and (...)
    • Séminaire PMMH - Denis Guthleben (CNRS)
      Vendredi 7 juin 2019 11:00-12:00 - Salle réunion PMMH 1
      Le CNRS, 80... et quelques années d'histoire
      Créé par un décret du 19 octobre 1939, le CNRS voit le jour dans un monde qui vient de basculer dans l'abîme : six semaines plus tôt, l'Allemagne nazie a envahi la Pologne et, dans la foulée, l'Angleterre et la France lui ont déclaré la guerre. Dans ce contexte, le nouvel établissement doit piloter la mobilisation (...)
    • Séminaire PMMH- Tom Mullin (Univ Oxford)
      Vendredi 31 mai 2019 11:00-12:00 - Salle réunion PMMH 1
      Levitation by Thin Viscous Layers
      The results of experimental investigations into balancing cuboids, cylinders and spheres‘ on a vertical moving wall which is covered a thin layer of viscous fluid are discussed. It is found that balance can be achieved over a narrow range of speeds in all cases. Systematic results for spheres and cylinders have (...)
    • Séminaire PMMH - Corrado Rainone (ITP Univ. of Amsterdam)
      Vendredi 24 mai 2019 11:00-12:00 - Salle réunion PMMH 1
      Addressing the protocol dependence of glass plasticity and yielding
      The glassy slowdown is a phenomenon whereupon a liquid, when supercooled below its melting point, exhibits a dramatic slowdown of its dynamics, such that it rapidly becomes impossible to maintain it equilibrated on feasible experimental timescales. The resulting out-of-equilibrium system is referred to as a glass, (...)
    • Séminaire PMMH - Michaël Baudoin (IEMN - Université de Lille)
      Vendredi 17 mai 2019 11:00-12:00 - Salle réunion PMMH 1
      Manipulation of fluid and particles at microscales with selective acoustical tweezers
      The selective contactless manipulation and assembly of physical and biological objects and fluids at micrometric down to nanometric scales promises tremendous development in fields as diverse as microrobotics, microfluidics, tissue engineering or micro/nano- medicine. In this regard, acoustical tweezers is a (...)
    • Séminaire PMMH-Bertrand Maury (Dpt maths, ENS)
      Vendredi 10 mai 2019 11:00-12:00 - Salle réunion PMMH 1
      Faster is Slower effect in crowds
      The so-called Faster is Slower (FiS) effect is commonly observed in real-life or experimental situations. In the context of evacuation processes, it expresses that increasing the speed (or, more generally, the eagerness to egress) of individuals may induce a reduction of the flow through the exit door. We propose (...)
    • Séminaire PMMH - Barakat Abdul (Ladhyx, Polytechnique)
      Vendredi 19 avril 2019 11:00-12:00 - Salle réunion PMMH 1
      Optimizing the Performance of Endovascular Stents : Cells, Vessels, and Connected Devices
      The pathological complications of atherosclerosis, namely heart attacks and strokes, are the leading cause of mortality in the world. The most common treatment for atherosclerosis is the implantation of a stent, a wire-mesh structure that is deployed on a balloon catheter and expanded at the location of arterial (...)
    • Séminaire PMMH - Priya Subramanian (Univ. of Leeds)
      Vendredi 12 avril 2019 11:00-12:00 - Salle réunion PMMH 1
      Modal Interactions and Superlattice Patterns
      Pattern formation in systems in many real world systems such as neural-field models, reaction-diffusion systems and fluid systems such as the Faraday wave system have separation of scales leading to nonlinear modal interactions. A general analysis of possible terms that can arise via modal interactions is subject (...)
    • Séminaire PMMH Michaël Berhanu (MSC)
      Vendredi 5 avril 2019 11:00-12:00 - Salle réunion PMMH 1
      Nonlinear interactions and turbulence of capillary surface waves
      The dynamics of the waves propagating on a water surface is often influenced by nonlinear effects. The complex and disordered patterns of gravity waves seen on a choppy sea are indeed interpreted as a statistical dynamic equilibrium of waves in interaction. Using among some others the hypothesis of weak non (...)
    • Séminaire PMMH-Elim Hong (IBPS, Sorbonne Université)
      Vendredi 29 mars 2019 11:00-12:00 - Salle réunion PMMH 1
      The yin yang pathway in the aversive brain
      The habenulo-interpeduncular (Hb-IPN) pathway is an evolutionarily conserved neural pathway mediating diverse pathophysiological behaviors including locomotion, fear, anxiety and nicotine addiction. The left and right habenular nuclei consists of hundreds of neurons that send long axons to project to its target, (...)
    • Séminaire PMMH - Corrado Maurini (Inst. J.-L. d'Alembert UPMC)
      Vendredi 22 mars 2019 11:00-12:00 - Salle réunion PMMH 1
      Nucleation and propagation of cracks in the variational approach to fracture
      Damage and fracture in brittle materials are associated to a loss of stiffness and an energy dissipation. These phenomena can be modelled as a minimisation problem on the sum of the elastic and the dissipated energies. This view led a fecund variational theory of fracture and to efficient numerical approximation (...)
    • Séminaire PMMH - Shreyas Mandre (Brown Univ., Providence)
      Vendredi 15 mars 2019 11:00-12:00 - Salle réunion PMMH 1
      Surfactants driven out of equilibrium by a flow
      A surfactant is a chemical compound that adsorbs onto a fluid-fluid interface and reduces its surface tension. A non-uniform distribution of such compounds at the interface causes a Marangoni stress that drives a flow, which in turn transports the surfactant. Estimating in situ the degree to which the adsorbed (...)
    • Séminaire PMMH Jean-Arthur Olive (ENS)
      Vendredi 22 février 2019 11:00-12:00 - Salle réunion PMMH 1
      From micro-crack to crustal fault
      Major fault systems dissect the Earth's crust at the boundaries of tectonic plates. On human time scales, faults may slip catastrophically during earthquakes, but fault lines remain steady features of tectonic landscapes. On geological time scales, new fault lines can form, shape mountains and basins as they (...)
    • Séminaire PMMH - Tobias Schneider (EPFL)
      Vendredi 15 février 2019 11:00-12:00 - Salle réunion PMMH 1
      A network of invariant solutions underlying spatio-temporal patterns in inclined layer convection
      Thermal convection in a fluid between two horizontal plates, a lower hot plate and an upper cold plate, exhibits chaotic dynamics and turbulence. If such a convection cell is inclined against gravity, buoyancy forces drive hot and cold fluid up and down the incline leading to a shear flow in the base state and the (...)
    • Séminaire PMMH - Marie Le Merrer (ILM, Univ. Lyon 1)
      Vendredi 8 février 2019 11:00-12:00 - Salle réunion PMMH 1
      Flow and surfactant dynamics in bubble rearrangements in foams
      Liquid foams are assemblies of gas bubbles in a soapy solution, found in many applications from cosmetics to oil drilling. The nature of surfactants changes the properties of the liquid-gas interfaces, and consequently the macroscopic properties of the foam like its stability and rheology. However, the flow (...)
    • Séminaire PMMH - Christophe Gissinger (ENS)
      Vendredi 1er février 2019 11:00-12:00 - Salle réunion PMMH 1
      Instabilités dans les écoulements entraînés par forçage magnétique
      La conversion d'énergie électromagnétique en énergie cinétique par un fluide conducteur de l'électricité est un phénomène omniprésent que l'on trouve dans plusieurs systèmes naturels ainsi que dans de nombreuses applications industrielles. Malgré l'importance de ces applications, plusieurs aspects des écoulements (...)
    • Séminaire PMMH - Sophie Ramananarivo (LadHyX, École Polytechnique)
      Vendredi 18 janvier 2019 11:00-12:00 - Salle réunion PMMH 1
      Emergent order, from fish schools to colloidal crystals
      It has long been thought that fish form into schools and birds into flocks so that each individual can take advantage of the flows produced by others. Using physical experiments that mimic the movements of fins or wings, we discover that flapping bodies not only swim or fly faster when grouped together but that (...)
    • Séminaire PMMH - Bernadette Bensaude-Vincent (Univ. Paris 1)
      Vendredi 11 janvier 2019 11:00-12:00 - Salle réunion PMMH 1
      Dialogue avec les matériaux
      Cette intervention est une invite à penser les matériaux comme des partenaires de nos aventures techniques. Après un bref historique des conditions d'émergence de la science des matériaux on montrera en quel sens les matériaux sont des hybrides de nature, de technique et de société. Et on illustrera cette condition (...)
  • 2018

    • Séminaire PMMH - Emmanuel Virot (EPFL - Harvard University)
      Vendredi 21 décembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Non-destructive prediction of the buckling load of soda cans and space rockets
      What is the critical load required to crush a soda can or a space rocket shell ? Surprisingly, there is no good way to estimate it, because of the high defect-sensitivity of the buckling instability. Here we measure the response of (imperfect) empty Coca-Cola cans to lateral poking and identify a generic stability (...)
    • Séminaire PMMH - Ory Schnitzer ( Imperial College London)
      Vendredi 14 décembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Asymptotic models of wave propagation and resonance in micro-structured media
      The study of microstructured media in acoustic settings is undergoing a considerable revival, with ideas originating from electromagnetism, photonic crystals and metamaterials influencing structured acoustic devices. Fundamentally, these advancements rely on incorporating resonances to effectively control wave (...)
    • Séminaire PMMH - Dimitry Kolomenskiy (JAMSTEC, Japon)
      Vendredi 7 décembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Bumblebee in flight and in digit
      Flight as a mode of animal locomotion emerges from interaction of internal biological systems with the external environment. Although it is currently, or even generally, unrealistic to fully reduce this problem to first principles, it proves possible and useful to combine low-dimensional models of biological (...)
    • Séminaire PMMH - Nicolas Taberlet (UCBL - ENS Lyon)
      Vendredi 30 novembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Morphogenèse glaciaire induite par ablation différentielle
      Les processus d'ablation de la glace sont multiples, la sublimation et la fonte étant dépendantes des conditions climatiques (ensoleillement, température, humidité, précipitations, vent…). Nous avons étudié la morphogenèse des « Zen Stones » qui se forment essentiellement sur le lac Baïkal au cours de la saison hivernale. (...)
    • Séminaire PMMH - Pierre Jop (SVI, Saint-Gobain)
      Vendredi 23 novembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Vers un matériau granulaire humide : quand la capillarité contrôle les interfaces
      Le mélange de grains avec un liquide est souvent la première étape d'un processus industriel, mais la nature triphasique du milieu rend la description globale difficile [1] : la cohésion des ponts capillaires [2] et la progression du liquide dans le système créent des zones de comportements mécaniques différents. De (...)
    • Séminaire PMMH - Lucio Isa (ETH, Zurich)
      Vendredi 16 novembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Breaking the symmetry : Designing colloidal motors and swimming at oil-water interfaces
      Breaking symmetry is at the very core of achieving propulsion at the microscale, where viscous forces dominate. Nature has perfected a range of different strategies to reach this goal for swimming microorganisms, which scientists have taken inspiration from to produce artificial micro-swimmers [1]. A common way to (...)
    • Séminaire PMMH - Mark Pauly (EPFL)
      Vendredi 9 novembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Light, Matter, Form - Computational Design of Functional Geometry
      In this talk, I will outline a general computational approach for material-aware design of complex 3D models. The key step is to identify suitable geometric abstractions of physical properties that enable effective computations with high predictive accuracy. I will show several examples of this approach for (...)
    • Séminaire PMMH - Thomas Lessinnes (EPFL)
      Vendredi 19 octobre 2018 11:00-12:00 - Salle réunion PMMH 1
      New tools for the mechanics of biofilaments
      Many biological objects present themselves as elongated slender structures. One may for instance mention proteins, polymers, DNA, bacterial fibres, fungi, stems, roots, arteries or neurons to cite but a few. It so happens that these bio-filaments are often organised as bundles of sub-filaments. The interplay of (...)
    • Séminaire PMMH- Nicolas FRANCOIS (The Australian National University)
      Vendredi 12 octobre 2018 11:00-12:00 - Salle réunion PMMH 1
      Surfing wave driven turbulence at a fluid surface
      Nicolas FRANCOIS, Hua XIA, Horst PUNZMANN, Michael SHATS Physics of Fluids Laboratory, The Australian National University When a laminar flow becomes turbulent, its energy is spread over a range of scales in a process named energy cascade. It has recently been discovered that turbulent flows can be forced by (...)
    • Séminaire PMMH - Laurent Duchemin (IRPhE, Marseille)
      Vendredi 5 octobre 2018 11:00-12:00 - Salle réunion PMMH 1
      Deux écoulements capillaires impulsionnels
      Dans cet exposé, je présenterai deux études expérimentales et théoriques sur des écoulements ayant une dynamique rapide à une échelle capillaire. La première concerne l'étirement impulsionnel d'un ligament liquide millimétrique. Dans le contexte général de la fragmentation, cette expérience modèle permet à la fois d'étudier (...)
    • Séminaire PMMH - Sara Jabbari Farouji (Gutenberg University, Mainz, Germany)
      Vendredi 28 septembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Controlling stability and transport of magnetic microswimmers by an external field
      Inspired by intriguing dynamics of magnetotactic bacteria, we present a minimal kinetic model for magnetic swimmers in an external magnetic field to investigate their collective behavior. Our kinetic model couples a Fokker-Planck equation for active particles in an external magnetic field to the Stokes flow. (...)
    • Séminaire PMMH - Marc Durand (MSC, Univ. Paris Diderot)
      Vendredi 21 septembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Milieux cellulaires fluides et réseaux : microstructure et propriétés effectives
      Les propriétés structurelles (géométrie, topologie, désordre) d'un matériau à l'échelle de ses constituants affectent profondément ses propriétés effectives, telles que sa réponse mécanique ou acoustique. Au cours de ce séminaire, je présenterai diverses études visant à caractériser - de manière exacte ou statistique - les (...)
    • Séminaire PMMH - Hans Herrmann (ETH, Zürich)
      Vendredi 14 septembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Structures granulaires renforcées par un fil et éjections granulaires d'un milieu poreux
      Je vais présenter deux sujets granulaires : Le premier c'est la stabilisation d'une colonne granulaire avec un fil. Il s'agit de comprendre avec des expériences et des simulations numériques pourquoi et comment stabilisent des piliers renforcés par ficelle selon une nouvelle technique développée par des architectes. (...)
    • Séminaire PMMH - Fernando Peruani (Univ. de Nice)
      Vendredi 7 septembre 2018 11:00-12:00 - Salle réunion PMMH 1
      Towards a non-equilibrium statistical mechanics of biological and biomimetic systems
      Collective phenomena are observed in biological and biomimetic systems at all scales, from bacterial systems to sheep herds in biology, and from Quincke rollers to bristlebots or kilobots in man-made, active systems. Provided that these non-equilibrium systems consist of independent units without a central control (...)
    • Séminaire PMMH : Antonio de Simone (Trieste)
      Vendredi 13 juillet 2018 11:00-12:00 - Salle réunion PMMH 1
      Biological and bio-inspired motility at microscopic scales : locomotion by shape control
      Locomotion strategies employed by unicellular organism are a rich source of inspiration for studying mechanisms for shape control. In fact, in an overwhelming majority of cases, biological locomotion can be described as the result of the body pushing against the world, by using shape change. Motion is then a (...)
    • Séminaire PMMH - Federico Toschi (Technische Universiteit, Eindhoven)
      Vendredi 6 juillet 2018 11:00-12:00 - Salle réunion PMMH 1
      Turbulence and plastic events in fluid emulsions
      Emulsions made of immiscible fluids can display an very rich phenomenology. In this talk we will discuss how to numerically model fluid emulsions and we will present results from recent numerical studies. The numerical model that we employ is based on the multi-component Lattice Boltzmann method as it provides a (...)
    • Séminaire PMMH - Philippe Marcq (Institut Curie)
      Vendredi 29 juin 2018 11:00-12:00 - Salle réunion PMMH 1
      From cells to tissue : A continuum model of epithelial mechanics
      A continuum model of epithelial tissue mechanics is formulated using cellular-level mechanical ingredients and cell morphogenetic processes, including cellular shape changes and cellular rearrangements. This model incorporates stress and deformation tensors, which can be compared with experimental data. Focusing (...)
    • Séminaire PMMH - Alexander Alexeev (Georgia Tech)
      Vendredi 22 juin 2018 11:00-12:00 - Salle réunion PMMH 1
      Biomimetic flapping and beating in viscous fluid
      We probe interactions of elastic structures with viscous fluids to investigate biomimetic approaches for fluid manipulation. We consider two systems : fish-like elastic fines and artificial cilia. Fish displays incredible agility and speed using oscillating flexible fins. We represent fins as thin elastic plates (...)
    • Séminaire PMMH - Ludovic Bellon (ENS Lyon)
      Vendredi 15 juin 2018 11:00-12:00 - Salle réunion PMMH 1
      Interrupteur optique, ondes gravitationnelles et physique statistique hors d'équilibre : des microleviers à tout faire
      Dans cette présentation, je montrerai comment le bruit thermique, loin d'être une simple nuisance, peut être un outil de précision dans l'exploration des matériaux autant qu'une porte ouverte sur des phénomènes de physique statistique intrigants. Guidée par la sérendipité, cette marche aléatoire de la physique à l'échelle (...)
    • Séminaire PMMH : Thomas Engels (LMD, ENS)
      Vendredi 8 juin 2018 11:00-12:00 - Salle réunion PMMH 1
      The impact of turbulence on flying insects in tethered and free flight : high-resolution numerical experiments
      Flapping insects are remarkably agile fliers, adapted to a highly turbulent environment. We present a series of high resolution numerical simulations of a bumblebee interacting with fully developed turbulent inflow. We consider both tethered and free flight, the latter with all six degrees of freedom coupled to (...)
    • Séminaire PMMH - John Kolinski (EPFL)
      Vendredi 1er juin 2018 11:00-12:00 - Salle réunion PMMH 1
      Wetting and contact line propagation on solid surfaces
      John M. Kolinski, EMSI, EPFL, Lausanne Switzerland The propagation of a contact line at the interface between liquid and a dry solid is of great fundamental and practical importance. We experimentally probe the dynamics of wetting that occur when an impacting drop first contacts a dry surface. We show that the (...)
    • Séminaire PMMH - Alba Marcellan (SIMM, ESPCI)
      Vendredi 25 mai 2018 11:00-12:00 - Salle réunion PMMH 1
      Some strategies for hydrogel toughening, from polymer adsorption onto NPs to responsive toughening by phase-separation
      Based on gel's remarkable features of absorption, storage or release of water (or solvent), gels have become essential in engineering applications like superabsorbent, soilless agriculture or tissue engineering and regeneration. Gels could also be key players for the design of flexible actuators, valves or (...)
    • Séminaire PMMH - Aleksandra Walczak (ENS - LPT)
      Vendredi 18 mai 2018 11:00-12:00 - Salle réunion PMMH 1
      Learning how bird flocks coordinate
      Flocking is a typical example of emergent collective behavior, where interactions between individuals produce collective patterns on large scales. I will discuss how by analysing different aspect of this motion based on quantitative data we can learn about the origins of these interactions. Specifically I will (...)
    • Séminaire PMMH - Giuseppe Zurlo (National University of Ireland)
      Vendredi 13 avril 2018 11:00-12:00 - Salle réunion PMMH 1
      Manufacturing of information-rich elastic bodies through surface deposition.
      In this talk I will discuss a recent theory, developed in collaboration with Lev Truskinovsky, that describes how desired distributions of residual stress can be achieved in bodies that are manufactured though the local addition of mass on their boundary [1],[2]. The source of residual stresses in elastic bodies (...)
    • Séminaire PMMH - Etienne Guyon
      Vendredi 6 avril 2018 11:00-12:00 - Salle réunion PMMH 1
      Une brève histoire des musées de sciences jusqu'au Palais de la Découverte aujourd'hui et demain (?)
      Au-delà de la diversité des conditions de leurs créations et de leurs fonctionnements dans l'histoire, on retrouve dans l'histoire des Musées des composantes universelles. Tout en faisant références à d'autres expériences culturelles scientifiques, nous axerons notre présentation sur quatre grands musées français. Tout (...)
    • Séminaire Charlotte K. Hemelrijk (Univ. Groningen)
      Mercredi 4 avril 2018 11:00-12:00 - Salle réunion PMMH 2
    • Séminaire PMMH - Leonardo Gordillo (Universidad De Santiago de Chile)
      Vendredi 30 mars 2018 11:00-12:00 - Salle réunion PMMH 1
      Drop-impact dynamics on solid surfaces : Evolution of impact force
      In this talk, I will give an overview of our latest advances in understanding the dynamics of drop impacts on dry solid surfaces. By synchronizing high-speed photography with fast force sensing, we simultaneously measured the temporal evolution of the shape and impact force of impacting drops over a wide range of (...)
    • Séminaire PMMH - Falko Ziebert (Universität Heidelberg)
      Vendredi 9 mars 2018 11:00-12:00 - A1 (Urbain)
      Self-propelled motion of biological cells and polymeric fibers
      Self-propulsion, i.e. self-organized motion in the absence of external forces, is an active research topic in non-equilibrium physics. Depending on the system, open questions span from the propulsive force generation and transfer over guiding mechanisms to collective effects in ensembles of self-propellers. The (...)

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.

Lien vers séminaires café (internes, tous les jeudis)

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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