Resources

Publications

  • Author(s): E. Dormy and H. K. Moffatt Stokes flow driven by rotation of two parallel cylinders inside a cylinder of large radius R0 is investigated, and the flow in this triply-connected domain is determined numerically, with particular focus on the narrow-gap situation, when the local behavior is well described by lubrication theory. The asymptotic situation for infinite R0 is inferred (i) when the cylinder axes are unconstrained, and (ii) when...
  • Author(s): Nan He, Yutong Cui, David Wai Quan Chin, Thierry Darnige, Philippe Claudin, and Benoît Semin We report experiments on the dissolution of a single particle during its sedimentation in a quiescent aqueous solution in the regime of low Reynolds and high Péclet numbers. We use butyramide, a chemical which does not change the density of water when it dissolves. The particle shrinks at a rate independent of its initial radius, in agreement...
  • Author(s): Alexis Commereuc, Sandrine Mariot, Emmanuelle Rio, and François Boulogne The structure of liquid foams follows simple geometric rules formulated by Plateau 150 years ago. On smooth surfaces, the foam liquid channels, also called pseudo Plateau borders, are straight between vertices. We demonstrate experimentally that on rough surfaces and under some conditions that we establish, the bubble footprint exhibits a morphological transition...
  • Author(s): Rebecca Liyanage, Xiaojing Fu, Ronny Pini, and Ruben Juanes We examine how fluids mix in three-dimensional (3D) porous materials due to differences in density which represent one mechanism of underground carbon dioxide storage. The experiment closely matched the simulation in terms of the patterns and speed of mixing. Interestingly, the experiment reveals columnar plumes self-organizing into a reticular pattern, previously seen only...
  • Author(s): G. Corsi, P. G. Ledda, G. Vagnoli, F. Gallaire, and A. De Simone Seed dispersal strategies exemplify the role of morphology in defining falling paths. Here, macroscopic geometry effects are systematically studied by considering trajectories of annular disks. Via linear stability analysis, we identify the stability boundary for vertical fall, with a non-monotonic behavior of the critical falling velocity with the hole size, before increasing...
  • Author(s): Hao Zeng, Feng Wang, and Chao Sun The impact and freezing process of a water droplet are studied experimentally, incorporating the presence of frost and salt. A distinct transition of the spreading dynamics is observed, altering from the well-known 1/2 inertial scaling law to a 1/10 capillary-viscous scaling law. By considering the effect of impact inertia, partial-wetting behavior, and salinity, the mechanism of this transition is...
  • Author(s): Diego Donzis and Shilpa Sajeev Turbulent flows comprise a multitude of scales which make them extremely difficult to analyze and simulate. In this work, we study homogeneous isotropic turbulence using a novel approach which solves the Navier-Sokes equations on a reduced set of modes that are sampled stochastically. The complementary set are solved using trivial dynamics. This method, called Selected Eddy Simulations, is able to capture...