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

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

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

Complexity of localised coherent structures in a boundary-layer flow

Tobias Klaus Kreilos

We study numerically transitional coherent structures in a boundary-layer flow with homogeneous suction at the wall (the so-called asymptotic suction boundary layer ASBL). The dynamics restricted to the laminar-turbulent separatrix is investigated in a spa ...

2014

Manipulating flow separation: sensitivity of stagnation points, separatrix angles and recirculation area to steady actuation

François Gallaire, Edouard Boujo

A variational technique is used to derive analytical expressions for the sensitivity of several topological indicators of flow separation to steady actuation. Considering the boundary layer flow above a wall-mounted bump, the six following representative q ...

Royal Soc2014

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

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

A real-time control system architecture for industrial power amplifiers

Faran Ahmed Qureshi

Power amplifiers are a highly important component in a range of industrial applications, such as, servo-drives, magnetic resonance imaging, energy systems, and audio. The control system for power amplifiers should satisfy a range of requirements, e. g., of ...

Ieee2013

Adiabatic vertical downward air-water flow pattern map: influence of inlet device, flow development length and hysteresis effects

John Richard Thome, Navid Borhani, Marco Milan

Flow patterns for adiabatic vertical downward air water flow in an 8.8 mm diameter channel have been studied. In particular, the influence of the inlet device, the flow history and the development length on the flow pattern have been investigated and asses ...

Elsevier2013

Optimal open-loop control of the recirculation length in the wake of a cylinder

François Gallaire, Edouard Boujo

We consider steady equilibrium solution of the 2-D Navier-Stokes equations describing the flow around a circular cylinder. It is well known that, for moderate Reynolds numbers, the recirculation length is an increasing function of the Reynolds number. We f ...

2012

Hydromorphological implications of local tributary widening for river rehabilitation

Anton Schleiss, Koen Blanckaert, Marcelo Leite Ribeiro, André Roy

The hydromorphological implications of the local widening of a tributary where it enters a confluence were investigated in a laboratory setting that is representative of the 20 major confluences on the channelized Upper Rhone River. Although local tributar ...

American Geophysical Union2012

Feedback control of the sawtooth period through real time control of the ion cyclotron resonance frequency

Jonathan Graves

Modification of the sawtooth period through ion cyclotron resonance frequency (ICRF) heating and current drive has been demonstrated in a number of experiments. The effect has been seen to depend critically on the location of the ICRF absorption region wit ...

IOP2011

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

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

Complexity of localised coherent structures in a boundary-layer flow

Manipulating flow separation: sensitivity of stagnation points, separatrix angles and recirculation area to steady actuation

Open-loop control of noise amplification in separated boundary layers

Open-loop control of a separated boundary layer

A real-time control system architecture for industrial power amplifiers

Adiabatic vertical downward air-water flow pattern map: influence of inlet device, flow development length and hysteresis effects

Optimal open-loop control of the recirculation length in the wake of a cylinder

Hydromorphological implications of local tributary widening for river rehabilitation

Feedback control of the sawtooth period through real time control of the ion cyclotron resonance frequency

Optimal open-loop control of the recirculation length in the wake of a cylinder

Hydromorphological implications of local tributary widening for river rehabilitation

Adiabatic vertical downward air-water flow pattern map: influence of inlet device, flow development length and hysteresis effects

Feedback control of the sawtooth period through real time control of the ion cyclotron resonance frequency

Open-loop control of noise amplification in separated boundary layers

Complexity of localised coherent structures in a boundary-layer flow

Open-loop control of a separated boundary layer

A real-time control system architecture for industrial power amplifiers

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

Manipulating flow separation: sensitivity of stagnation points, separatrix angles and recirculation area to steady actuation