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Offshore design codes

This section is focused on benchmarks of integrated codes for the analysis of offshore wind turbines. The substructure of an offshore wind turbine can be fixed or floating. The expression ”integrated codes” refers to codes that are able to model all the different effects that influence the dynamics of an offshore wind turbine in a coupled manner. The use of integrated codes for the analysis of offshore wind turbines is a physical requirement, because the different effects: aerodynamics, hydrodynamics, structural dynamics, control, are interrelated.

Figure 1: Schematic of top-level building level building-block models for offshore design codes (from IEA Task 30 OC4, Phase II Results Regarding a Floating Semisubmersible Wind System)

Based on "Model evaluation protocol for offshore design codes. Version 1" IRPWind WP6.2 2005

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Projects

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Riso Wake Lidar

Data Provider: 

DTU Wind Energy / Stuttgart University, Department of Wind Energy (SWE)

Data accesibility: 

The test case is offered to participants of the IEA Task 31 Wakebench

Site Description: 

Wake velocity measurements have been recorded by a pulsed lidar system as part of a measurement campaign conducted from June 2011 to early January 2012 at the DTU Wind Energy, Risø Campus test site located on the south-east side of Roskilde Fjord in Denmark. It is a fairly flat  and homogeneous onshore terrain mainly characterized by grassland. This test site is made of 3 stall regulated turbines: a Tellus 95kW, a Vestas V27 and a Nordtank 500kW. A satellite picture of the terrain with nearby obstacles, and centered on the lidar mounted Nordtank 500kW is  shown in Fig. 1.

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Risø Wake Lidar Single Wake

Scope

The benchmark is open to participants of WakeBench who want to validate the near-wake models in horizontally homogemeous terrain using lidar cross-sectional scans from 1 to 5 rotor diameter downstream.

Objectives

Determination of mean wake velocity ratio at hub height as function of downstream position for a Nordtank 500 kW stall regulated turbine in flat and horizontally homogeneous terrain at different atmospheric stabilities and wind conditions.

Data Accessibility

The benchmark is offered to participants of the IEA Task 31 Wakebench.

Input data

The necessary input parameters related to the turbine, the terrain and the ambient flow are:

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San Gregorio

Data Provider: 

Sorgenia Green s.r.l.

Data accesibility: 

Site Description: 

The wind farm is placed in southern Italy on a very complex terrain area; prior the installation of the turbines site assessment was done using met-mast measurements.

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San Gregorio Freeflow

Scope

Participants of the Wakebench projects are invited to join the benchmark for flow models over topography in neutral conditions. Simulations need to be performed to ensure an exhaustive characterization of the wind on the main directions. Reliability of the models will be investigated using the anemometric measurements from the available met-masts.

Objectives

Produce the best estimate of the flow field in neutral conditions above the San Gregorio Magno site for the 240°, 270° and 30° wind directions.

Data Accessibility

The benchmark is offered to participants of the IEA Task 31 Wakebench who has signed the NDA attached to the test case guide.

Input data

The following input data are at disposal for simulating San Gregorio Magno flow field in neutral conditions:

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San Gregorio Wakes

Scope

The benchmark is open to the participants of the Wakebench project using flow and wake models for complex terrains. 

Objectives

The main goal of this benchmark is to assess flow and wake models behaviour on a very complex terrain environment.

Simulations need to be performed to ensure an exhaustive characterization of the wind on the main direction sector (270°) for the wind farm sub-cluster T10, T11, T12, T13. Reliability of the models will be investigated using the anemometric and SCADA measurements.

Data Accessibility

Brief description about the accessibility of the data

Input data

The ASTER digital terrain, the roughness model (winter and summer retrieved fromwww.dataforwind.com), as well as the layout of the sub-cluster shall be provided to the participants (the coordinate system used is UTM-WGS84-33N).

The wind turbines are Siemens SWT-93 with a nominal power of 2300 kW and a hub height of 80 m; the nominal thrust and power curves shall be available.

The conditions for simulating the wind farm flow are the anemometric conditions at reference met-mast position at hub-height.

 

Mean velocity at hub height (80 m) at met-mast position:         from 5 to 9 m/s

Mean direction at hub height (80 m) at met-mast position:       from 260 to 280°

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Sexbierum

Data Provider: 

The data has been extracted from Cleijne (1993, 1992).

Data accesibility: 

The test case is offered to participants of the IEA Task 31 Wakebench.

Site Description: 

The measurements were carried out in 1992 at the Dutch Experimental Wind Farm at Sexbierum, which is in the northern part of The Netherlands about 4 km from the shore.  The wind farm is in flat, homogeneous terrain characterized by grassland.  The wind farm contains 18 HOLEC turbines each producing 310 kW rated power and with a rotor diameter of 30 m and a hub height of 35 m.  The turbines are arranged in a 3 × 6 array as shown in Figure 1.

Sections: Files
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Sexbierum Double Wake Neutral

Scope

The benchmark is open to participants of the Wakebench project using wake and, possibly, atmospheric boundary layer models. This is a realistic wake case measured at the Dutch Experimental Wind Farm at Sexbierum that has the added complexity of multiple wake interaction. It should test a wake model’s ability to reproduce the wake merging process.

This benchmark follows the single-wake case (Sexbierum_SingleWakeNeutral). Participants are strongly encouraged to participate in both exercises for a more complete model evaluation.

Objectives

Demonstrate how wake models perform and capture the wake merging process in the presence of atmospheric shear and turbulence.

Data Accessibility

The benchmark is offered to participants of the IEA Task 31 Wakebench.

Input data

The conditions for simulating the Sexbierum double wake are:

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Sexbierum Single Wake Neutral

Scope

The benchmark is open to participants of the Wakebench project using wake and, possibly, atmospheric boundary layer models. This is a realistic wake case measured at the Dutch Experimental Wind Farm at Sexbierum.  It focuses on the single wake case, which is a good “building-block” to the double wake case (Sexbierum_DoubleWakeNeutral).

Objectives

Demonstrate how wake models perform and capture the wake formation and evolution process in the presence of atmospheric shear and turbulence.

Data Accessibility

The benchmark is offered to participants of the IEA Task 31 Wakebench.

Input data

The conditions for simulating the Sexbierum double wake are:

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SOWE 2017

The Fifth Symposium on OpenFOAM in Wind Energy

Conference description:

The Fifth Symposium on OpenFOAM® in Wind Energy (SOWE 2017) is hosted by the Department of Wind Energy at CENER (National Renewable Energy Centre of Spain). As in the previous editions, the symposium offers a space to share the latest developments based on OpenFOAM® for Wind Energy applications. The symposium brings together experts, beginners, developers and final end users to discuss the research results and techniques to solve the new demands of the Wind Energy sector.

The First Edition of SOWE was hosted by ForWind and Fraunhofer IWES in Oldenburg (Germany).

The Second Edition of SOWE was hosted by NREL and RASEI in Boulder (Colorado, USA).

The Third Edition of SOWE was hosted by Politecnico di Milano in Milan (Italy).

The Fourth Edition of SOWE was hosted by Delft University of Technology (The Netherlands).

Date and venue:

The conference will be held on 26, 27 and 28 April 2017.

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Static TEFlap TL-190-82

Site Description: 

The test case was performed in the Laminar Wind Tunnel (LWT) of the Institute of Aerodynamics and Gas Dynamics (IAG), University of Stuttgart, Germany.

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Static TEFlap TL-190-82 Re 3.3M

Scope

The benchmark is public for the validation of aerodynamic codes and models of 2D airfoils including deformable geometries. The cases of the benchmark are static flap configurations in clean and transition conditions.

Objectives

Produce the best estimate of the aerodynamic polars of the TL-190-82 airfoil with a TE flap at different static deployments.

Data Accessibility

The benchmark is offered to participants of AVATAR, and provided as public in the windbench platform by the University of Stuttgart.

Input data

The input data for simulating the TL-190-82 airfoil with a static flap are:
•    Airfoil geometry http://it.cener.com/demo/windbench/system/files/tl190-82.txt
•    Airfoil chord = 0.6 m
•    Tripped conditions = 5% chord
•    TE flap geometry = Rigid 10% chord
•    Flap angle = -10º, -5º, 0º, 5º, 10º
•    Wind speed = 82.5 m/s
•    Angle of attack range (see experimental data)

Validation data

The experimental data available in each file (see experimental data):
•    Angle of attack (AoA)
•    Lift force coefficient (Cl)
•    Drag force coefficient (Cd)

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