Publications associées à A linearized approach for the control of aerodynamic forces in flow past a square cylinder

Sensitivity of aerodynamic forces in laminar and turbulent flow past a square cylinder

François Gallaire, Edouard Boujo, Philippe Meliga

We use adjoint-based gradients to analyze the sensitivity of the drag force on a square cylinder. At Re = 40, the flow settles down to a steady state. The quantity of interest in the adjoint formulation is the steady asymptotic value of drag reached after ...

Amer Inst Physics2014

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 aerodynamic forces in laminar and turbulent flow past a square cylinder

François Gallaire, Edouard Boujo, Philippe Meliga

We use adjoint-based gradients to analyze the sensitivity of the drag force on a square cylinder. At Re = 40, the flow settles down to a steady state. The quantity of interest in the adjoint formulation is the steady asymptotic value of drag reached after ...

2014

Hydrodynamics of turbulent flows within arrays of circular cylinders

Ana Margarida Da Costa Ricardo

In rivers riparian vegetation can have not only strong interaction with the flow but also with the ecological services of the aquatic system. In wetlands and along riverbanks often tree-like vegetation with quite stiff trunks can be found. The study of the ...

EPFL - LCH2014

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

Heat Transfer Augmentation in a Straight Channel via Two Oscillating Circular Cylinders

David Andrew Barry, Mohsen Cheraghi

We consider flow-through systems in which the characteristic length is limited such that turbulent flow is not reached even at high fluid velocities, i.e., the flow remains laminar. Inthese flow regimes, inducing circulation or vortices in the flow enhance ...

2014

The impact of variable building height on drag, flow and turbulence over a realistic suburban surface

Marc Parlange, Marc Calaf Bracons, Marco Giovanni Giometto, Andreas Christen

In realistic urban environments, where buildings experience variable heights, the tallest structures have a disproportional impact on drag, mean flow and turbulence. Although wind-engineering studies document well the effects of individual high-rise buildi ...

2014

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 destabi ...

Cépaduès Editions2013

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

François Gallaire, Edouard Boujo

Sensitivity analysis is used to design an open-loop control for separated flows. The length of the recirculation region

l_c

is expressed as a cost functional, and its sensitivity to actuation is derived analytically. This analysis allows to identify regi ...

2013

Open-loop control of noise amplification in separated boundary layers

François Gallaire, Edouard Boujo

Linear optimal gains are computed for the subcritical two-dimensional separated boundary-layer flow past a bump. Very large optimal gain values are found, making it possible for small-amplitude noise to be strongly amplified and to destabilize the flow. Th ...

2013

A linearized approach for the control of aerodynamic forces in flow past a square cylinder

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Sensitivity of aerodynamic forces in laminar and turbulent flow past a square cylinder

Open-loop control of a separated boundary layer

Sensitivity of aerodynamic forces in laminar and turbulent flow past a square cylinder

Hydrodynamics of turbulent flows within arrays of circular cylinders

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

Heat Transfer Augmentation in a Straight Channel via Two Oscillating Circular Cylinders

The impact of variable building height on drag, flow and turbulence over a realistic suburban surface

Open-loop control of a separated boundary layer

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

Open-loop control of noise amplification in separated boundary layers

Sensitivity of aerodynamic forces in laminar and turbulent flow past a square cylinder

Open-loop control of noise amplification in separated boundary layers

Open-loop control of a separated boundary layer

Hydrodynamics of turbulent flows within arrays of circular cylinders

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

Heat Transfer Augmentation in a Straight Channel via Two Oscillating Circular Cylinders

Sensitivity of aerodynamic forces in laminar and turbulent flow past a square cylinder

The impact of variable building height on drag, flow and turbulence over a realistic suburban surface

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

Open-loop control of a separated boundary layer