Publications related to Experiments of flow separation at the inner bank of open-channel bends

Voltage Control in Active Distribution Networks Under Uncertainty in the System Model: A Robust Optimization Approach

Mario Paolone, Konstantina Christakou, Ali Abur

Within the context of ancillary services for Active Distribution Networks (ADNs), application of intelligent control techniques is required in order to achieve specific operation objectives. Despite their differences, most control mechanisms proposed in th ...

2018

Identification of the wave speed and the second viscosity in cavitating flow with 2D RANS computations - Part II

François Avellan, Sébastien Alligné

The 1D modelling of cavitation vortex rope dynamics in Francis turbine draft tube is decisive for prediction of pressure fluctuations in the system. However, models are defined with parameters which values must be quantified either experimentally or numeri ...

Iop Publishing Ltd2015

Sensitivity and open-loop control of stochastic response in a noise amplifier flow: the backward-facing step

François Gallaire, Edouard Boujo

The two-dimensional backward-facing step flow is a canonical example of noise amplifier flow: global linear stability analysis predicts that it is stable, but perturbations can undergo large amplification in space and time as a result of non-normal effects ...

Cambridge University Press2015

Practical mapping of the draw resonance instability in film casting of Newtonian fluids

Mathias Simon Daniel Bechert

The influence of viscosity and inlet velocity on the draw resonance instability of film casting processes is quantitatively analysed. By linear stability analysis of a Newtonian model including inertia and gravity effects, stability curves for different co ...

2015

An adjoint-based approach to the optimal control of separated flows

Edouard Boujo

Flow separation is relevant to many industrial applications, since it is detrimental to the aerodynamic performance of vehicles, induces vibrations in mechanical structures, but can also contribute to improve mixing in combustion devices. In this thesis, t ...

EPFL2014

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

François Gallaire, Edouard Boujo, Philippe Meliga

The analysis of Strykowski & Sreenivasan (JFM, 1990) provides experimental evidence that a small control cylinder suitably positioned in the wake of a main cylinder can alter vortex shedding close to the instability threshold. This problem was addressed fr ...

2014

Three dimensional flow field at confluent fixed-bed open channels

Sebastián Guillén Ludeña, António Heleno Cardoso

River confluences are known for their marked 3D patterns and, due to the complexity of local flow features and bed morphology, they require particular consideration. Although there are studies on the flow structure in junctions of two streams, amore detail ...

CRC Press/Balkema2014

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

Shift Dynamics of Capillary Self-Alignment

Massimo Mastrangeli

This paper describes the dynamics of capillary self-alignment of components with initial shift offsets from matching receptor sites. The analysis of the full uniaxial self-alignment dynamics of foil-based mesoscopic dies from pre-alignment to final settlin ...

Springer2014

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

Experiments of flow separation at the inner bank of open-channel bends

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Voltage Control in Active Distribution Networks Under Uncertainty in the System Model: A Robust Optimization Approach

Identification of the wave speed and the second viscosity in cavitating flow with 2D RANS computations - Part II

Sensitivity and open-loop control of stochastic response in a noise amplifier flow: the backward-facing step

Practical mapping of the draw resonance instability in film casting of Newtonian fluids

An adjoint-based approach to the optimal control of separated flows

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

Three dimensional flow field at confluent fixed-bed open channels

Sensitivity of stochastic perturbations in a noise amplifier flow

Shift Dynamics of Capillary Self-Alignment

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

Sensitivity of stochastic perturbations in a noise amplifier flow

Voltage Control in Active Distribution Networks Under Uncertainty in the System Model: A Robust Optimization Approach

Three dimensional flow field at confluent fixed-bed open channels

Practical mapping of the draw resonance instability in film casting of Newtonian fluids

Identification of the wave speed and the second viscosity in cavitating flow with 2D RANS computations - Part II

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

An adjoint-based approach to the optimal control of separated flows

Shift Dynamics of Capillary Self-Alignment

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

Sensitivity and open-loop control of stochastic response in a noise amplifier flow: the backward-facing step