Formation of tip-vortices on triangular prismatic-shaped cliffs Part 1: A wind tunnel study

Cochard, Steve; Letchford, Chris; Earl, Thomas; Montlaur, Adeline de Villardi de

doi:10.1016/j.jweia.2012.06.003

Cited by 5 publications

(11 citation statements)

References 12 publications

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“…The zone of interest of this simulation is a rectangle plane located at z¼0.1143 m above the cliff and extending for 0.2 m along the cliff, that is À0:1 mo x o0:1 m and À0:15 m o yo 0:15 m. This zone is where PIV data from Cochard et al (2012) are available.…”

Section: Test Setup and Methodologymentioning

confidence: 99%

“…The following boundary conditions were set for the numerical simulations, based on experimental data from Cochard et al (2012). The boundary layer velocity profile can be approximated with the following logarithm law:…”

Section: Test Setup and Methodologymentioning

confidence: 99%

“…Cochard et al (2012) performed wind tunnel tests of flow over models made from generic 3D triangular elements arranged in sawtooth patterns. Flow changes with shape and wind direction were also studied.…”

Section: Introductionmentioning

confidence: 99%

“…Flow changes with shape and wind direction were also studied. The present study, carried out with the commercial CFD solver ANSYS CFX13, aims to validate the experimental results of Cochard et al (2012) and to present further and more complete results, such as 3D flow streamlines. Section 2 presents the main hypotheses considered for the CFD study.…”

Section: Introductionmentioning

confidence: 99%

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Formation of tip-vortices on triangular prismatic-shaped cliffs. Part 2: A computational fluid dynamics study

Montlaur

Cochard

Fletcher

2012

Journal of Wind Engineering and Industrial Aerodynamics

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Section: Test Setup and Methodologymentioning

confidence: 99%

Section: Test Setup and Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Formation of tip-vortices on triangular prismatic-shaped cliffs. Part 2: A computational fluid dynamics study

Montlaur

Cochard

Fletcher

2012

Journal of Wind Engineering and Industrial Aerodynamics

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“…Wind energy applications have first focused on locations where enhanced speed could be utilized to increase energy output, which explains why coastal and exposed hill tops have been preferred development sites, taking advantage of speed-up effects [2,13]. More recently, especially in the last 5 years, offshore renewable energy, including tidal and offshore wind energy, has been undergoing rapid development globally.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of 2D Vertical Axis Wind and Tidal Turbines with a Degree-Adaptive Hybridizable Discontinuous Galerkin Method

Montlaur

Giorgiani

2015

Springer Tracts in Mechanical Engineering

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This work presents a 2D study of vertical axis turbines with application to wind or tidal energy production. On the one hand, a degree-adaptive Hybridizable Discontinuous Galerkin (HDG) method is used to solve this incompressible NavierStokes problem. The HDG method allows to drastically reduce the coupled degrees of freedom (DOF) of the computation, seeking for an approximation of the solution that is defined only on the edges of the mesh. The discontinuous character of the solution provides an optimal framework for a degree-adaptive technique. Degreeadaptivity further reduces the number of DOF in the HDG computation by means of degree-refining only where more precision is needed. On the other hand, the finite volume method of ANSYS ® is used to validate and compare the obtained results. IntroductionIn the last two decades, driven by the efforts to develop energy alternatives in order to reduce fossil fuel consumption and carbon emissions, wind power has been growing fast as an energy source, leading to cover 8 % of the European Union electricity consumption in 2013 [5]. Wind energy applications have first focused on locations where enhanced speed could be utilized to increase energy output, which explains why coastal and exposed hill tops have been preferred development sites, taking advantage of speed-up effects [2,13]. More recently, especially in the last 5 years, offshore renewable energy, including tidal and offshore wind energy, has been undergoing rapid development globally. 2013 was indeed a record year for offshore installations, with 1:567 MW of new capacity grid connected, and with A. Montlaur ( )

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Siting wind turbines near cliffs—the effect of wind direction

et al. 2015

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The optimal siting of wind turbines in the vicinity of cliffs is investigated with respect to inflow yaw angle, using wind tunnel experiments. Wind statistics are measured above a generic forward facing step, namely, the speed-up, turbulence intensity, changes in wind direction and the persistence and frequency of vortices shed from the crest of the cliff. The experiments demonstrate that at half a cliff height above the cliff, and that same distance downstream of the crest, there exists an optimal region with increases in wind speed, combined with lower levels of turbulence intensity across the range of inflow angles that were investigated. In contrast, the far wake experiences a velocity deficit and an increase in turbulence intensity, when compared with the inflow. Furthermore, vortices are shed from the downstream reattachment region and persist beyond 10 cliff heights downstream.

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Formation of tip-vortices on triangular prismatic-shaped cliffs Part 1: A wind tunnel study

Cited by 5 publications

References 12 publications

Formation of tip-vortices on triangular prismatic-shaped cliffs. Part 2: A computational fluid dynamics study

Formation of tip-vortices on triangular prismatic-shaped cliffs. Part 2: A computational fluid dynamics study

Numerical Study of 2D Vertical Axis Wind and Tidal Turbines with a Degree-Adaptive Hybridizable Discontinuous Galerkin Method

Siting wind turbines near cliffs—the effect of wind direction

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