Publications by François Gallaire

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

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

Beer tapping: dynamics of bubbles after impact

François Gallaire, Pierre-Thomas Paul Brun, Vladislav Mantic Lugo

Beer tapping is a well known prank where a bottle of beer is impacted from the top by a solid object, usually another bottle, leading to a sudden foam overflow. A description of the shock-driven bubble dynamics leading to foaming is presented based on an e ...

Iop Publishing Ltd2015

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 ...

2015

Second-order sensitivity of parallel shear flows and optimal spanwise-periodic flow modifications

François Gallaire, Edouard Boujo, Andrea Fani

The question of optimal spanwise-periodic modification for the stabilisation of spanwise-invariant flows is addressed. A second-order sensitivity analysis is conducted for the linear temporal stability of parallel flows U-0 subject to small-amplitude spanw ...

Cambridge University Press2015

The effect of rounding corners or cutting edges on the absolute/convective instability properties of mixing layers

François Gallaire

We revisit the inviscid spatio-temporal stability properties of mixing layers. Earlier comparisons of the dispersion relations pertaining to the broken line model and the hyperbolic tangent profile have shown that the temporal stability properties are main ...

Elsevier2015

Breaking Anchored Droplets in a Microfluidic Hele-Shaw Cell

François Gallaire, Pierre-Thomas Paul Brun

We study microfluidic self-digitization in Hele-Shaw cells using pancake droplets anchored to surface-tension traps. We show that above a critical flow rate, large anchored droplets break up to form two daughter droplets, one of which remains in the anchor ...

Amer Physical Soc2015

Controlled reattachment in separated flows: a variational approach to recirculation length reduction

François Gallaire, Edouard Boujo

A variational technique is used to derive analytical expressions for the sensitivity of recirculation length to steady forcing in separated flows. Linear sensitivity analysis is applied to the two-dimensional steady flow past a circular cylinder for Reynol ...

Cambridge University Press2014

Open-loop control of a separated boundary layer

François Gallaire, Edouard Boujo

Linear optimal gains

G_{opt}(\omega)

are computed for the separated boundary-layer flow past a two-dimensional bump in the subcritical regime. Very large values are found, making it possible for small-amplitude noise to be strongly amplified and to desta ...

Elsevier France-Editions Scientifiques Medicales Elsevier2014

Sensitivity of stochastic perturbations in a noise amplifier flow

François Gallaire, Edouard Boujo

It is a well-known fact that small-amplitude perturbations can be amplified in globally stable flows due to non-normal mechanisms. This leads in the time domain to the transient growth of some initial disturbances, and in the frequency domain to the amplif ...

2014

François Gallaire

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

Instability of wind turbine wakes immersed in the atmospheric boundary layer

Beer tapping: dynamics of bubbles after impact

Instability of wind turbine wakes immersed in the atmospheric boundary layer

Second-order sensitivity of parallel shear flows and optimal spanwise-periodic flow modifications

The effect of rounding corners or cutting edges on the absolute/convective instability properties of mixing layers

Breaking Anchored Droplets in a Microfluidic Hele-Shaw Cell

Controlled reattachment in separated flows: a variational approach to recirculation length reduction

Open-loop control of a separated boundary layer

Sensitivity of stochastic perturbations in a noise amplifier flow

Breaking Anchored Droplets in a Microfluidic Hele-Shaw Cell

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

Instability of wind turbine wakes immersed in the atmospheric boundary layer

Second-order sensitivity of parallel shear flows and optimal spanwise-periodic flow modifications

The effect of rounding corners or cutting edges on the absolute/convective instability properties of mixing layers

Open-loop control of a separated boundary layer

Controlled reattachment in separated flows: a variational approach to recirculation length reduction

Beer tapping: dynamics of bubbles after impact

Instability of wind turbine wakes immersed in the atmospheric boundary layer

Sensitivity of stochastic perturbations in a noise amplifier flow