257 citations · 785 across the 44 of their papers we have counts for
44 papers · 1 filter
Imperfect bifurcations in a laminar 3D bluff body wake: effect of pitch and yaw
Atharva Lagwankar, Alessandro Chiarini, François Gallaire +1
We study the effect of pitch and yaw on the bifurcations of the laminar flow past an Ahmed body, a bluff body of width-to-height ratio and length-to-height ratio .…
Sudden expansion stability thresholds modified by lateral flows
T. Salamon, R. Debuysschère, A. Chafaï +2
We study the flow in a symmetric three-dimensional confined sudden expansion with lateral inflow at Reynolds number below 300 and varying lateral-to-central flow rate ratio, using…
A minimal model of pump foil dynamics
Eunok Yim, Francois Gallaire
Pump foiling enables a hydrofoil surfboard to sustain forward motion on flat water using only periodic leg pumping, converting vertical oscillations into hydrodynamic lift and thru…
Effective flows across diffusio-phoretic membranes
Kevin Wittkowski, Pier Giuseppe Ledda, Edoardo Carlo Giordano +2
Flows enabled by phoretic mechanisms are of significant interest in several biological and biomedical processes, such as bacterial motion and targeted drug delivery. Here, we devel…
Drops can Perpetually Bounce over a Vibrating Wettable Solid
Lebo Molefe, Tomas Fullana, François Gallaire +1
On the surface of a vibrating liquid bath, instead of coalescing, a drop will continually bounce on a thin film of air between the drop and the free surface, giving rise to rich ch…
Nonmodal amplitude equations
Yves-Marie Ducimetière, François Gallaire
We consider fluid flows for which the linearized Navier-Stokes operator is strongly non-normal. The responses of such flows to external perturbations are spanned by a generically v…
Coating thickness prediction for a viscous film on a rough plate
Lebo Molefe, Giuseppe A. Zampogna, John M. Kolinski +1
Surface roughness significantly modifies the liquid film thickness entrained when dip coating a solid surface, particularly at low coating velocity. Using a homogenization approach…
Releasing trapped Taylor bubbles via centrifugation and inclination
Alice Marcotte, Pier Giuseppe Ledda, Valentin Buriasco +3
In confined systems, the entrapment of a gas volume with an equivalent spherical diameter greater than the dimension of the channel can form extended bubbles that obstruct fluid ci…
Noise-induced transitions past the onset of a steady symmetry-breaking bifurcation: the case of the sudden expansion
Yves-Marie Ducimetière, Edouard Boujo, François Gallaire
We consider fluid flows, governed by the Navier-Stokes equations, subject to a steady symmetry-breaking bifurcation and forced by a weak noise acting on a slow time scale. By gener…
A revised gap-averaged Floquet analysis of Faraday waves in Hele-Shaw cells
Alessandro Bongarzone, Baptiste Jouron, Francesco Viola +1
Existing theoretical analyses of Faraday waves in Hele-Shaw cells rely on the Darcy approximation and assume a parabolic flow profile in the narrow direction. However, Darcy's mode…
Stability of liquid film coating a horizontal cylinder: interplay of capillary and gravity forces
Shahab Eghbali, Simeon Djambov, François Gallaire
We study the drainage of a viscous liquid film coating outside a horizontal cylinder. We first study the evolution of the axially invariant draining flow, initiated at rest with un…
Swirling against the forcing: evidence of stable counter-directed sloshing waves in orbital-shaken reservoirs
Alice Marcotte, François Gallaire, Alessandro Bongarzone
We study the free surface response in a cylindrical container undergoing an elliptic periodic orbit. For small forcing amplitudes and deep liquid layers, we quantify the effect of…
Super-harmonically resonant swirling waves in longitudinally forced circular cylinders
Alice Marcotte, François Gallaire, Alessandro Bongarzone
Resonant sloshing in circular cylinders was studied by Faltinsen et al. (2016), whose theory was used to describe steady-state resonant waves due to time-harmonic container's ellip…
On the liquid film instability of an internally coated horizontal tube
Shahab Eghbali, Yves-Marie Ducimetiere, Edouard Boujo +1
We study numerically and theoretically the gravity-driven flow of a viscous liquid film coating the inner side of a horizontal cylindrical tube and surrounding a shear-free dynamic…
Numerical estimate of the viscous damping of capillary-gravity waves: A macroscopic depth-dependent slip-length model
Alessandro Bongarzone, Francois Gallaire
We propose a numerical approach to regularize the contact line singularity appearing in the computation of viscous capillary-gravity waves with moving contact line in cylindrical c…
Breaking one into three: surface-tension-driven droplet breakup in T-junctions
Jiande Zhou, Yves-Marie Ducimetière, Daniel Migliozzi +4
Droplet breakup is an important phenomenon in the field of microfluidics to generate daughter droplets. In this work, a novel breakup regime in the widely studied T-junction geomet…
An amplitude equation modeling the single-to-double crest wave transition in orbital shaken cylindrical containers
Alessandro Bongarzone, Margherita Guido, François Gallaire
The container motion along a planar circular trajectory at a constant angular velocity, i.e. orbital shaking, is of interest in several industrial applications, e.g. for fermentati…
Sub-harmonic parametric instability in nearly-brimful circular-cylinders: a weakly nonlinear analysis
Alessandro Bongarzone, Francesco Viola, Simone Camarri +1
In lab-scale Faraday experiments, meniscus waves respond harmonically to small-amplitude forcing without threshold, hence potentially cloaking the instability onset of parametric w…
Fiber buckling in confined viscous flows: an absolute instability described by the Ginzburg-Landau equation
Jean Cappello, Olivia du Roure, François Gallaire +2
We explore the dynamics of a flexible fiber transported by a viscous flow in a Hele-Shaw cell of height comparable to the fiber height. We show that long fibers aligned with the fl…
Weak nonlinearity for strong nonnormality
Yves-Marie Ducimetière, Edouard Boujo, François Gallaire
We propose a theoretical approach to derive amplitude equations governing the weakly nonlinear evolution of nonnormal dynamical systems when they experience transient growth or res…
Prediction of Self-Assembled Dewetted Nanostructures for Photonics Applications via a Continuum Mechanics Framework
Louis Martin-Monier, Pier Giuseppe Ledda, Pierre-Luc Piveteau +2
When a liquid film lies on a non-wettable substrate, the configuration is unstable and the film then retracts from a solid substrate to form droplets. This phenomenon, known as dew…
Too fast to grow: Dynamics of pendant drops sliding on a thin film
Etienne Jambon-Puillet, Pier Giuseppe Ledda, François Gallaire +1
Pendant drops suspended on the underside of a wet substrate are known to accumulate fluid from the surrounding thin liquid film, a process that often results in dripping. The growt…
Nonlinear evolution of the centrifugal instability using a semi-linear model
Eunok Yim, Paul Billant, Francois Gallaire
We study the nonlinear evolution of the centrifugal instability developing on a columnar anticyclone with a Gaussian angular velocity using a semi-linear approach. The model consis…
Frequency selection in a gravitationally stretched capillary jet in the jetting regime
Isha Shukla, François Gallaire
A capillary jet falling under the effect of gravity continuously stretches while thinning downstream. We report here the effect of external periodic forcing on such a spatially var…