Publications related to Turbulent vortex shedding from a blunt trailing edge hydrofoil

Canopy-wake dynamics and wind sheltering effects on Earth surface fluxes

Fernando Porté Agel, Corey Dean Markfort

The atmospheric boundary layer adjustment at the abrupt transition from a canopy (forest) to a flat surface (land or water) is investigated in a wind tunnel experiment. Detailed measurements examining the effect of canopy turbulence on flow separation, red ...

Springer2014

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

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

Unsteady asymmetric engulfment regime in a T-mixex

Andrea Fani

Unsteady flow regimes in a micro T-mixer are investigated. Direct numerical simulations (DNS) show that, in agreement with experimental and numerical results in the literature, when the Reynolds number is increased above a critical value larger than those ...

Amer Inst Physics2014

Comoving frames and symmetry-related motions in parallel shear flows

Tobias Klaus Kreilos

Parallel shear flows have continuous symmetries of translation in the downstream and spanwise directions. As a consequence, flow states that differ in their spanwise or downstream location but are otherwise identical are dynamically equivalent. In the case ...

2014

Obstacle-induced spiral vortex breakdown

Mohamed Farhat, François Gallaire, Matthieu Dreyer, Simon Pasche

An experimental investigation on vortex breakdown dynamics is performed. An adverse pressure gradient is created along the axis of a wing-tip vortex by introducing a sphere downstream of an elliptical hydrofoil. The instrumentation involves high-speed visu ...

Springer2014

Effect of trailing edge shape on hydrodynamic damping for a hydrofoil

Mohamed Farhat, Matthieu Dreyer, Zhifeng Yao

Flow induced vibration on a hydrofoil may be significantly reduced with a slight modification of the trailing edge without alteration of the hydrodynamic performance. Particularly, the so called Donaldson trailing edge shape gave remarkable results and is ...

Elsevier2014

Generating Mobile Fluidic Traps for Selective Three-Dimensional Transport of Microobjects

Mahmut Selman Sakar

We demonstrate noncontact transport of microscale objects in liquid environments using untethered, magnetic microrobots. The flow and vortices generated by the rotating microrobot are efficient for selective and gentle trapping, stable transport, and targe ...

American Institute of Physics2014

Mind the gap: a new insight into the tip leakage vortex using stereo-PIV

Mohamed Farhat, Cécile Münch-Alligné, Matthieu Dreyer

The tip leakage vortex (TLV), which develops in the clearance between the rotor and the stator of axial hydro turbines, has been studied for decades. Yet, many associated phenomena are still not understood. For instance, it remains unclear how the clearanc ...

Springer2014

Edge states for the turbulence transition in the asymptotic suction boundary layer

Tobias Schneider, Tobias Klaus Kreilos

We demonstrate the existence of an exact invariant solution to the Navier-Stokes equations for the asymptotic suction boundary layer. The identified periodic orbit with a very long period of several thousand advective time units is found as a local dynamic ...

Cambridge University Press2013

Turbulent vortex shedding from a blunt trailing edge hydrofoil

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Canopy-wake dynamics and wind sheltering effects on Earth surface fluxes

Open-loop control of a separated boundary layer

Complexity of localised coherent structures in a boundary-layer flow

Unsteady asymmetric engulfment regime in a T-mixex

Comoving frames and symmetry-related motions in parallel shear flows

Obstacle-induced spiral vortex breakdown

Effect of trailing edge shape on hydrodynamic damping for a hydrofoil

Generating Mobile Fluidic Traps for Selective Three-Dimensional Transport of Microobjects

Mind the gap: a new insight into the tip leakage vortex using stereo-PIV

Edge states for the turbulence transition in the asymptotic suction boundary layer

Canopy-wake dynamics and wind sheltering effects on Earth surface fluxes

Comoving frames and symmetry-related motions in parallel shear flows

Unsteady asymmetric engulfment regime in a T-mixex

Obstacle-induced spiral vortex breakdown

Effect of trailing edge shape on hydrodynamic damping for a hydrofoil

Open-loop control of a separated boundary layer

Edge states for the turbulence transition in the asymptotic suction boundary layer

Complexity of localised coherent structures in a boundary-layer flow

Generating Mobile Fluidic Traps for Selective Three-Dimensional Transport of Microobjects

Mind the gap: a new insight into the tip leakage vortex using stereo-PIV