All Spaces

Bolund Neutral

Scope

The benchmark revisits the blind test of 2009 now allowing the participants to optimize their models to obtain the best match to the validation dataset.

Objectives

Test model fine-tuning strategies that will be applied in complex terrain sites. Evaluate turbulence models in a test site with well defined boundary conditions.

Data Accessibility

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

Input data

The conditions for simulating the Bolund flow field in neutral conditions are:

Sections: Public
Request group membership

CRES PULL OUT TESTS

Scope

This benchmark checks the static restoring force and tensions of a mooring system mounted on  a semi-submersible floating support structure for an offshore wind turbine. No other external forces are applied on the structure while the waterline is calm throughout the experiment.

Data Accessibility

The benchmark is offered to participants of IRPWIND WP6

Objectives

The objective of this benchmark is the correct simulation of the response of both the structure and the mooring system under the influence of externally imposed forces and moments.

Input data

The participants of the benchmark will be granted access to MT2016 F-049 MARINTEK report and to the geometry specifications of the semisubmersible floater for running with their numerical models. The following data can be derived from the provided files:

  • Geometry and material properties of both support structure and  mooring system
  • Scaling factors for simulation of the experiment on a scale 1:30
  • The vectors of restoring forces and moments  exerted on the floater as well as their attachment points on the structure
  • The mooring system layout, i.e. the anchor locations on the basin floor and the fairlead positions on the floater

Validation data

The partners must provide the following data:

Sections: Public
Request group membership

DU00W212_High-Reynolds

Site Description: 

The wind tunnel test has been performed at the HDG wind tunnel, which is a closed return circuit with a closed test section of 0.6 x 0.6 m. (width x height) and 1 m. length, and a contraction ratio of 5.85. This tunnel can be pressurized up to 100 bars to achieve high Reynolds numbers. The wind tunnel speed is controlled by rpm regulation of the constant pitch fan in the range from 3.5 to 35 m/s, which allows for Reynolds number effect simulations with negligible Mach influence as it stays always below 0.1.
The test section used for the measurements is a dedicated 2D test section where the model is horizontally installed in the mid part into a remote controlled alpha mechanism capable of performing 360º of angular setting of the model. Top and bottom wall centerlines are equipped with 23 pressure taps each, equally distributed over the whole length of the test section, which can be used to calculate wall interference properties

Sections: Files
Request group membership

ECN Wind Turbine Test Station Wieringermeer (EWTW)

Site Description

The ECN Wind Turbine Test Station Wieringermeer (EWTW) is a test location for wind turbines that comprises of six prototype turbines, five research N80 turbines and five large meteorological masts.

Data Provider

ECN Wind Turbine Test Site Wieringermeer

Sections: Files
Request group membership

EERA-DTOC (2012-2015)

EERA-DTOC Design Tool for Offshore Wind Farm Cluster. The concept of the EERA-DTOC project is to combine this expertise in a common integrated software tool for the optimized design of offshore wind farms and wind farm clusters acting as wind power plants. The design tool includes state-of-the-art wake, yield and electrical models available in the consortium, as a plug-in architecture with the possibility for third party models to extend and enhance predictions. In order to decrease uncertainties around wind farm wake predictions, a small measurement campaign together with the new data available from the industry partners will enable better tuning, and eventually better modeling of the far-field of wind farm wakes.

More info: http://www.eera-dtoc.eu/

Sections: Documents
Request group membership

Egmond aan Zee (OWEZ)

Site Description

  • 36 Vestas V90 3MW
  • Located 10-18km at the coast near Egmond aan Zee

Sections: Files
Request group membership

Furry Hill

Data Provider: 

Ian Harman (CSIRO)

Data accesibility: 

The test case is offered to participants of the IEA Task 31 Wakebench who agree with the terms and conditions described below.

Site Description: 

The experiment is described in Finnigan and Brunet (1995). It is a logical follow-up of the homogeneous waving wheat experiment of Brunet et al. (1994) to study the effects of terrain-induced heterogeneity in canopy flows. To this end, the waving wheat model is placed on top of a two-dimensional hill.

Sections: Files
Request group membership

Furry Hill Neutral

Scope

The benchmark is open to participants of the Wakebench project using canopy models. The benchmark will evaluate the ability of the models at reproducing the interaction of canopy and hill flows in idealized conditions.

Objectives

Demonstrate the performance of the models at reproducing mean flow and turbulent quantities on a hill-induced heterogeneous canopy. Test model fine-tuning strategies in a controlled environment when boundary conditions are well defined.

Data Accessibility

The benchmark is offered to participants of the IEA Task 31 Wakebench who agree with the terms and conditions described below.

Input data

The conditions for simulating the Furry Hill experiment in neutral conditions are:

  • Inlet profile: measurements at X = -2.125 m (X/L = -5.06)
  • Hill profile: Zh(X)=h/(1+(X/L)2), with X = 0 at the crest of the ridge, truncated at X = ±925 mm where it smoothly meets the flat floor. Ridge height h = 150 mm, half-length L = 420 mm.
  • Canopy height: hc = 0.047 m
  • Canopy drag coefficient: Cd = 0.68
  • Canopy-area-density: A = 0.1 m-1
  • Obukhov length: L0 = ∞
  • Use dry air with a density ρ = 1.225 kg/m3 and dynamic viscosity μ = 1.73e-5 kg/ms

Sections: Public
Request group membership

GABLS

Introduction

The GEWEX Atmospheric Boundary Layer Study (GABLS) series of benchmarks have been developed to improve the representation of the atmospheric boundary layer in regional and large-scale atmospheric models. The model intercomparison studies have been organized for single-column models (SCM) and large-eddy simulation models (LES). The cases are based on observations over flat terrain in the Artic, Kansas (USA), Cabauw (The Netherlands) and Dome C (Antarctica).

GABLS1 simulated a quasi-steady stable boundary layer resulting from 9 hours of uniform surface cooling [1][2][3]. GABLS2 simulated a diurnal cycle, still with idealized forcing, by simplifying measurements from the CASES-99 experiment in Kansas [4][5]. GABLS3 simulated a real diurnal case with a strong nocturnal low-level jet (LLJ) at the Cabauw met tower in the Netherlands [6][7][8][9][10]. In GABLS4, the aim is to study the interaction of a boundary layer with strong stability in relatively simple surface coupling characteristics.

Sections: Files
Request group membership

GABLS 3

Status

The GABLS3 benchmark carried out jointly in the NEWA, Wakebench and MesoWake projects finished in June 2017. You can find the results and data open-access in the following links:

Additionaly, you can also find individual evaluation results and data from CFDWindSCM:

Sections: Public
Request group membership

Horns Rev

Data Provider: 

Kurt S. Hansen (DTU)

Data accesibility: 

The test case is offered to participants of the IEA Task 31 Wakebench and EU project EERA-DTOC Work Package 1.

Site Description: 

The Horns Rev wind farm (HR) has a shared ownership by Vattenfall AB (60%) and DONG Energy AS (40%). It is located 14 km from the west coast of Denmark, with a water depth of 6-14 m. The wind farm has a rated capacity of 160 MW comprising 80 wind turbines, which are arranged in a regular array of 8 by 10 turbines, with a spacing of 560 m in both directions covering an area of 5x3.8 km2. 

Sections: Files
Request group membership

Horns Rev Neutral

Scope

The benchmark is open to participants of both Wakebench and EERA-DTOC for wake model validation on wind farms with regular layout under neutral atmospheric conditions.

Objectives

Determine the power deficit along a single row of 10 turbines, with an internal spacing of 7D, inside a wind farm of regular layout. Evaluate the sensitivity of the model performance to the wind direction sector size.

Data Accessibility

The benchmark is offered to participants of the IEA Task 31 Wakebench and EU project EERA-DTOC Work Package 1.

Input data

The conditions for simulating the wind farm flow are:

Sections: Public
Request group membership

Horns Rev Spacing

Scope

The benchmark is open to participants of both Wakebench and EERA-DTOC for wake model validation on wind farms with regular layout under neutral atmospheric conditions.

Objectives

Determine the power deficit along single rows consisting of 6 or 10 turbines, with an varying internal spacing, inside a wind farm of regular layout. Evaluate the sensitivity of the model performance to the spacing.

Data Accessibility

The benchmark is offered to participants of the IEA Task 31 Wakebench and EU project EERA-DTOC Work Package 1.

Input data

The conditions for simulating the wind farm flow are:

Sections: Public
Request group membership

Horns Rev Stratified

Scope

The benchmark is open to participants of both Wakebench and EERA-DTOC for wake model validation on wind farms with regular layout under neutral atmospheric conditions.

Objectives

Determine the power deficit along a single row of 10 turbines, with an internal spacing of 7D, inside a wind farm of regular layout. Evaluate the sensitivity of the model performance for three atmospheric stratifications, which can be categorized as stable, neutral or unstable.

Data Accessibility

The benchmark is offered to participants of the IEA Task 31 Wakebench and EU project EERA-DTOC Work Package 1.

Input data

The conditions for simulating the wind farm flow are:

Sections: Public
Request group membership