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François Gallaire

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Publications associées (155)

Three-dimensional Rayleigh–Taylor instability under a unidirectional curved substrate

Gioele Mariano Nicolò Balestra, François Gallaire, Pierre-Thomas Paul Brun, Nicolas Igor Jacques Kofman

We investigate the Rayleigh–Taylor instability of a thin liquid film coated on the inside of a cylinder whose axis is orthogonal to gravity. We are interested in the effects of geometry on the instability, and contrast our results with the classical case o ...

Cambridge University Press2017

Spatio-temporal stability of the Kármán vortex street and the effect of confinement

François Gallaire, Saviz Mowlavi, Cristobal Manuel Arratia Martinez

The instability of the Kármán vortex street is revisited under a spatio-temporal perspective that allows the taking into account of the advection of the vortices by the external flow. We analyse a simplified point vortex model and show through numerical si ...

Cambridge University Press2016

Impact of rotating and fixed nozzles on vortex breakdown in compressible swirling jet flows

Leonhard Kleiser, François Gallaire

Vortex breakdown of swirling, round jet flows is investigated in the compressible, subsonic regime by means of Direct Numerical Simulation (DNS). This is achieved by solving the compressible Navier-Stokes equations on a cylindrical grid using high-order sp ...

Elsevier2016

Self-consistent model for the saturation mechanism of the response to harmonic forcing in the backward-facing step flow

François Gallaire, Vladislav Mantic Lugo

Certain flows denominated as amplifiers arc characterized by their global linear stability while showing large linear amplifications to sustained perturbations. As the forcing amplitude increases, a strong saturation of the response appears when compared t ...

Cambridge University Press2016

Hub vortex instability within wind turbine wakes: Effects of wind turbulence, loading conditions, and blade aerodynamics

François Gallaire, Giacomo Valerio Iungo, Francesco Viola

The near wake of wind turbines is characterized by the presence of the hub vortex, which is a coherent vorticity structure generated from the interaction between the root vortices and the boundary layer evolving over the turbine nacelle. Bymoving downstrea ...

Amer Physical Soc2016

The stability of a rising droplet: an inertialess non-modal growth mechanism

François Gallaire, Giacomo Gallino, Lailai Zhu

Prior modal stability analysis (Kojima et al., Phys. Fluids, vol. 27, 1984, pp. 19-32) predicted that a rising or sedimenting droplet in a viscous fluid is stable in the presence of surface tension no matter how small, in contrast to experimental and numer ...

Cambridge University Press2016

Fabrication of slender elastic shells by the coating of curved surfaces

Gioele Mariano Nicolò Balestra, François Gallaire, Pierre-Thomas Paul Brun, Pedro Miguel Nunes Pereira de Almeida Reis

Various manufacturing techniques exist to produce double-curvature shells, including injection, rotational and blow molding, as well as dip coating. However, these industrial processes are typically geared for mass production and are not directly applicabl ...

Nature Publishing Group2016

A self-consistent formulation for the sensitivity analysis of finite-amplitude vortex shedding in the cylinder wake

François Gallaire, Philippe Meliga, Edouard Boujo

We use the adjoint method to compute sensitivity maps for the limit-cycle frequency and amplitude of the Benard von Karmzin vortex street in the wake of a circular cylinder. rfhe sensitivity, analysis is performed in the frame of the semi-linear self consi ...

Cambridge University Press2016

Mode selection in trailing vortices: harmonic response of the non-parallel Batchelor vortex

François Gallaire, Cristobal Manuel Arratia Martinez, Francesco Viola

In the present study, the response of model trailing vortices subjected to a harmonic forcing is studied. To this purpose, a globally stable non-parallel Batchelor vortex is considered as the baseflow. Direct numerical simulations (DNS) show that a large v ...

Cambridge University Press2016

Pushing amplitude equations far from threshold: application to the supercritical Hopf bifurcation in the cylinder wake

François Gallaire, Philippe Meliga, Edouard Boujo, Vladislav Mantic Lugo, Cristobal Manuel Arratia Martinez

The purpose of this review article is to push amplitude equations as far as possible from threshold. We focus on the Stuart-Landau amplitude equation describing the supercritical Hopf bifurcation of the flow in the wake of a cylinder for critical Reynolds ...

Iop Publishing Ltd2016

Rayleigh-Taylor instability under curved substrates: An optimal transient growth analysis

Gioele Mariano Nicolò Balestra, François Gallaire, Pierre-Thomas Paul Brun

We investigate the stability of thin viscous films coated on the inside of a horizontal cylindrical substrate. In such a case, gravity acts both as a stabilizing force through the progressive drainage of the film and as a destabilizing force prone to form ...

Amer Physical Soc2016

A pancake droplet translating in a Hele-Shaw cell: lubrication film and flow field

François Gallaire, Lailai Zhu

We adopt a boundary integral method to study the dynamics of a translating droplet confined in a Hele-Shaw cell in the Stokes regime. The droplet is driven by the motion of the ambient fluid with the same viscosity. We characterize the three-dimensional (3 ...

Cambridge University Press2016

Vortex-Breakdown-Induced Particle Capture in Branching Junctions

François Gallaire, Andrea Fani

We show experimentally that a flow-induced, Reynolds number-dependent particle-capture mechanism in branching junctions can be enhanced or eliminated by varying the junction angle. In addition, numerical simulations are used to show that the features respo ...

American Physical Society2016

Foam on troubled water: Capillary induced finite-time arrest of sloshing waves

François Gallaire, Francesco Viola, Pierre-Thomas Paul Brun, Benjamin Jérémy Dollet

Interfacial forces exceed gravitational forces on a scale small relative to the capillary length-two millimeters in the case of an air-water interface-and therefore dominate the physics of sub-millimetric systems. They are of paramount importance for vario ...

Amer Inst Physics2016

Inkjet Printing of Viscous Monodisperse Microdroplets by Laser-Induced Flow Focusing

Demetri Psaltis, François Gallaire, Christophe Moser, Miguel Antonio Modestino, Paul Delrot

The on-demand generation of viscous microdroplets to print functional or biological materials remains challenging using conventional inkjet-printing methods, mainly due to aggregation and clogging issues. In an effort to overcome these limitations, we impl ...

American Physical Society (APS)2016

Saturation of the response to stochastic forcing in two-dimensional backward-facing step flow: A self-consistent approximation

François Gallaire, Vladislav Mantic Lugo

Selective noise amplifiers are characterized by large linear amplification to external perturbations in a particular frequency range despite their global linear stability. Applying a stochastic forcing with increasing amplitude, the response undergoes a st ...

Amer Physical Soc2016

Energetic Macroscopic Representation of A Linear Reciprocating Compressor Model

Alfred Rufer, Philippe Barrade, François Gallaire, Mahbod Heidari

This article introduces the energetic macroscopic representation (EMR) as approach for the dynamic nonlinear modeling of a reciprocating air compressor. EMR has been introduced recently for research development in complex electromechanical systems and is b ...

Elsevier2015

Effects of incoming wind condition and wind turbine aerodynamics on the hub vortex instability

François Gallaire, Giacomo Valerio Iungo, Francesco Viola

Dynamics and instabilities occurring in the near-wake of wind turbines have a crucial role for the wake downstream evolution, and for the onset of far-wake instabilities. Furthermore, wake dynamics significantly affect the intra-wind farm wake flow, wake i ...

Iop Publishing Ltd2015

Interaction between counterpropagating Rossby waves and capillary waves in planar shear flows

François Gallaire, Luca Biancofiore

A counterintuitive destabilizing effect of the surface tension in planar wakes has been observed by Tammisola et al. ["Effect of surface tension on global modes of confined wake flows," Phys. Fluids 23, 014108 (2011)] and Biancofiore et al. ["Direct numeri ...

American Institute of Physics2015

Instability of wind turbine wakes immersed in the atmospheric boundary layer

Fernando Porté Agel, François Gallaire, Giacomo Valerio Iungo, Francesco Viola

In this work a technique capable to investigate the near-wake stability properties of a wind turbine immersed in the atmospheric boundary layer is presented. Specifically, a 2D local spatial stability analysis is developed in order to take into account typ ...

Iop Publishing Ltd2015

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