Publications related to Wind tunnel study of a vertical axis wind turbine in a turbulent boundary layer flow

Simulation of Turbulent Flow Inside and Above Wind Farms: Model Validation and Layout Effects

A recently-developed large-eddy simulation framework is validated and used to investigate turbulent flow within and above wind farms under neutral conditions. Two different layouts are considered, consisting of thirty wind turbines occupying the same total ...

Springer Netherlands2013

Near-wake instability and sensitivity analysis of wind turbines immersed in the atmospheric boundary layer

Fernando Porté Agel, François Gallaire, Giacomo Valerio Iungo, Francesco Viola

In wind farms, the separation distance among wind turbines is mainly determined by the downstream recovery of wind turbine wakes, which affects in turn power production and fatigue loads of downstream turbines. Thus, the optimization of a wind farm relies ...

2013

Mean and turbulent kinetic energy budgets inside and above very large wind farms under conventionally-neutral condition

Fernando Porté Agel, Mahdi Abkar

In this study, large-eddy simulations (LES) is combined with a turbine model to investigate all the terms in the budgets of mean and turbulent kinetic energy (TKE) inside and above very large wind farms. Emphasis is placed on quantifying the relative contr ...

2013

Linear stability analysis of wind turbine wakes performed on wind tunnel measurements

Fernando Porté Agel, François Gallaire, Giacomo Valerio Iungo, Francesco Viola

Wind tunnel measurements were performed for the wake produced by a three-bladed wind turbine immersed in uniform flow. These tests show the presence of a vorticity structure in the near-wake region mainly oriented along the streamwise direction, which is d ...

Cambridge University Press2013

The Effect of Free-Atmosphere Stratification on Boundary-Layer Flow and Power Output from Very Large Wind Farms

Fernando Porté Agel, Mahdi Abkar

Large-eddy simulation is used to study the influence of free-atmosphere stratification on the structure of atmospheric boundary-layer flow inside and above very large wind farms, as well as the power extracted by the wind turbines. In the simulations, tuni ...

Mdpi Ag2013

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

Coherent Structures and the k−1 spectral behavior

Valentin Simeonov, Marc Parlange, Marc Calaf Bracons, Holly Jayne Oldroyd

Here we present unique evidence of a k −1 scaling behaviour in the atmospheric boundary layer and its connection to large scale coherent structures within the boundary layer. Wind lidar measurements were conducted above a lake under cold atmospheric condit ...

2013

Coherent structures and the k(-1) spectral behaviour

Valentin Simeonov, Marc Parlange, Marc Calaf Bracons, Holly Jayne Oldroyd

l Here we present unique evidence of a k(-1) scaling behaviour in the atmospheric boundary layer and its connection to large scale coherent structures within the boundary layer. Wind lidar measurements were conducted above a lake under cold atmospheric con ...

Amer Inst Physics2013

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

Near-wake flow structure downwind of a wind turbine in a turbulent boundary layer

Fernando Porté Agel, Wei Zhang, Corey Dean Markfort

Wind turbines operate in the surface layer of the atmospheric boundary layer, where they are subjected to strong wind shear and relatively high turbulence levels. These incoming boundary layer flow characteristics are expected to affect the structure of wi ...

Springer-Verlag2012

Wind tunnel study of a vertical axis wind turbine in a turbulent boundary layer flow

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Simulation of Turbulent Flow Inside and Above Wind Farms: Model Validation and Layout Effects

Near-wake instability and sensitivity analysis of wind turbines immersed in the atmospheric boundary layer

Mean and turbulent kinetic energy budgets inside and above very large wind farms under conventionally-neutral condition

Linear stability analysis of wind turbine wakes performed on wind tunnel measurements

The Effect of Free-Atmosphere Stratification on Boundary-Layer Flow and Power Output from Very Large Wind Farms

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

Coherent Structures and the k−1 spectral behavior

Coherent structures and the k(-1) spectral behaviour

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

Near-wake flow structure downwind of a wind turbine in a turbulent boundary layer

Simulation of Turbulent Flow Inside and Above Wind Farms: Model Validation and Layout Effects

Linear stability analysis of wind turbine wakes performed on wind tunnel measurements

Near-wake instability and sensitivity analysis of wind turbines immersed in the atmospheric boundary layer

The Effect of Free-Atmosphere Stratification on Boundary-Layer Flow and Power Output from Very Large Wind Farms

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

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

Near-wake flow structure downwind of a wind turbine in a turbulent boundary layer

Mean and turbulent kinetic energy budgets inside and above very large wind farms under conventionally-neutral condition

Coherent structures and the k(-1) spectral behaviour

Coherent Structures and the k−1 spectral behavior