85 citations · 355 across the 20 of their papers we have counts for
21 papers
Particle trapping in vortex crystals
Jean-Régis Angilella, S. Ravichandran
We study the motion of inertial particles in two-dimensional inviscid and viscous vortex crystals, where vortices are placed at the tips of a regular polygon, and determine the con…
Emergent oscillations and chaos in non-compliant microfluidic networks
Yanxuan Shao, Jean-Regis Angilella, Adilson Motter
Incompressible fluids in microfluidic networks with non-rigid channels can exhibit flow rate oscillations analogous to electric current oscillations in RLC circuits. This is due to…
Mass crystals and cage effect in vorticity crystals
Jean-Régis Angilella
We study the motion of tiny heavy inertial particles advected by a two dimensional inviscid fluid flow composed of identical point vortices regularly placed on a ring, and form…
Chaotic advection in a steady three-dimensional MHD flow
Julien Fontchastagner, Jean-François Scheid, Jean-Régis Angilella +1
We investigate the 3D stationary flow of a weakly conducting fluid in a cubic cavity, driven by the Lorentz force created by two permanent magnets and a weak constant current. Our…
Separatrix crossing due to multiplicative colored noise
Jean-Régis Angilella
The effect of weak multiplicative colored noise on the dynamics of a Hamiltonian system is studied by means of asymptotic methods, in the vicinity of homoclinic or heteroclinic tra…
Spontaneous oscillations and negative-conductance transitions in microfluidic networks
Daniel J. Case, Jean-Regis Angilella, Adilson E. Motter
The tendency for flows in microfluidic systems to behave linearly poses a challenge for designing integrated flow control schemes to carry out complex fluid processing tasks. This…
Braess's paradox and programmable behaviour in microfluidic networks
Daniel J. Case, Yifan Liu, Istvan Z. Kiss +2
Microfluidic systems are now being designed with precision to execute increasingly complex tasks. However, their operation often requires numerous external control devices due to t…
Probability of noise-induced separatrix crossing for inertial particles in flows
Jean-Régis Angilella
The motion of weakly inertial Brownian particles, transported by steady two-dimensional fluid flows, is investigated by means of asymptotic methods. We focus on the phenomenon of n…
The effect of colored noise on heteroclinic orbits
Jean-Régis Angilella
The dynamics of a weakly dissipative Hamiltonian system submitted to stochastic perturbations has been investigated by means of asymptotic methods. The probability of noise-induced…
Levitation of heavy particles against gravity in asymptotically downward flows
Jean-Regis Angilella, Daniel J. Case, Adilson E. Motter
In the fluid transport of particles, it is generally expected that heavy particles carried by a laminar fluid flow moving downward will also move downward. We establish a theory to…
Chaotic sedimentation of particle pairs in a vertical channel at low Reynolds number: multiple states and routes to chaos
Romuald Verjus, Sylvain Guillou, Alexander Ezersky +1
The sedimentation of a pair of rigid circular particles in a two-dimensional vertical channel containing a Newtonian fluid is investigated numerically, for terminal particle Reynol…
The role of inertia for the rotation of a nearly spherical particle in a general linear flow
F. Candelier, J. Einarsson, F. Lundell +2
We analyse the angular dynamics of a neutrally buoyant nearly spherical particle immersed in a steady general linear flow. The hydrodynamic torque acting on the particle is obtaine…
Effect of weak fluid inertia upon Jeffery orbits
J. Einarsson, F. Candelier, F. Lundell +2
We consider the rotation of small neutrally buoyant axisymmetric particles in a viscous steady shear flow. When inertial effects are negligible the problem exhibits infinitely many…
Rotation of a spheroid in a simple shear at small Reynolds number
J. Einarsson, F. Candelier, F. Lundell +2
We derive an effective equation of motion for the orientational dynamics of a neutrally buoyant spheroid suspended in a simple shear flow, valid for arbitrary particle aspect ratio…
Tumbling of asymmetric microrods in a microchannel flow
J. Einarsson, B. M. Mihiretie, A. Laas +4
We describe results of measurements of the orientational motion of glass microrods in a microchannel flow, following the orientational motion of particles with different shapes. We…
Critical Stokes number for the capture of inertial particles by recirculation cells in 2D quasi-steady flows
Romuald Verjus, Jean-Régis Angilella
Inertial particles are often observed to be trapped, temporarily or permanently, by recirculation cells which are ubiquitous in natural or industrial flows. In the limit of small p…
Inertial particle trapping in an open vortical flow
Jean-Regis Angilella, Rafael D. Vilela, Adilson E. Motter
Recent numerical results on advection dynamics have shown that particles denser than the fluid can remain trapped indefinitely in a bounded region of an open fluid flow. Here, we i…
Aperiodic tumbling of microrods advected in a microchannel flow
J. Einarsson, A. Johansson, S. K. Mahato +4
We report on an experimental investigation of the tumbling of microrods in the shear flow of a microchannel (40 x 2.5 x 0.4 mm). The rods are 20 to 30 microns long and their diamet…
Asymptotic properties of wall-induced chaotic mixing in point vortex pairs
Jean-Regis Angilella
The purpose of this work is to analyze the flow due to a potential point vortex pair in the vicinity of a symmetry line (or "wall"), in order to understand why the presence of the…
Note on dust trapping in inviscid vortex pairs with unequal strengths
Tatiana Nizkaya, Jean-Regis Angilella, Michel Bues
We investigate theoretically the motion of tiny heavy passive particles transported in a plane inviscid flow consisting of two point vortices, in order to understand particle dispe…
Dust trapping in inviscid vortex pairs
Jean-Regis Angilella
The motion of tiny heavy particles transported in a co-rotating vortex pair, with or without particle inertia and sedimentation, is investigated. The dynamics of non-inertial sedim…