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Vortex Generators - DU97W300 airfoil

Experimental parameter study for passive vortex generators on a 30% thick airfoil

Site Description: 

The dataset prepared in this package relates to the publication "Experimental parameter study for passive vortex generators on a 30% thick airfoil". Pressure data over the surface of the DU97W300 airfoil is collected at a Reynolds number of 2 million, for 41 different vortex generator configurations. These cases are described in a README accompanying this data. The sensitivities to the different vortex generator parameters and analysis of further results can be found in the article which will appear in the Wind Energy journal.

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Vortex Generators - Flat Plate

Site Description: 

Particle Image Velocimetry (PIV) measurements of vortex generators (VG) on a flat plate with zero- and adverse-pressure gradients. Time-averaged velocity fields with turbulence statistics have been acquired in transverse planes in the wake of rectangular, vane-type vortex generators up to 50 device heights downstream the VG trailing edges.

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WAUDIT (2009-2013)

Wind Resource Assessment Audit and Standardization (WAUDIT) is an Initial Training Network (ITN), a Marie-Curie action funded under the FP7-People program. The objective of WAUDIT is the generation of a pool of researchers, in the field of wind resource assessment, in order to support the technological development of wind energy as one of the fastest growing industries worldwide.

The development of state-of-the-art measurement and numerical and physical modelling techniques provides a wide range of methodologies whose potential will be assessed by the network. The training activities are carried out under the umbrella of the European Wind Energy Academy (EAWE) in the organization of PhD seminars, schools and conferences.

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Waving Wheat

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 Brunet et al. (1994). It consists on single-point velocity statistics in a wind tunnel within and above a model of a waving wheat crop, made of nylon stalks 47 mm high and 0.25 mm wide, in a square grid of side 5 mm and frontal area index 0.47. This model was designed by Finnigan and Mulhearn (1978) with special attention to the aeroelastic properties of the crop. The canopy area density is A=10 m-1. The canopy drag coefficient Cd depends on the height. An average value of 0.68 can be assumed over the depth of the canopy, where drag = CdAU2.

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Waving Wheat Neutral

Scope

The benchmark is open to participants of the Wakebench project using canopy models. This is the first element of the building-block approach in this range, so it should be mandatory if you intend to participate with this model in other test cases down the line.

Objectives

Demonstrate the performance of the model at reproducing the mean flow and turbulent quantities of a horizontally-homogeneous canopy profile.

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 waving wheat canopy profile in neutral conditions are:

  • Free-stream wind speed: U0 = 10.2 m/s
  • 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

Validation data

The validation consists on mean and standard deviation values for the horizontal wind speed (U) and mean values of the shear stress (uw).

Model runs

The user is free to define the computational domain and model settings that best fit with the validation data.

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Windbench: V&V Repositories for Wind Energy

The WINDBENCH verification and validation (V&V) platform is developed to guide wind energy model developers and end-users on best practices for the evaluation of models. To this end, the platform offers an updated inventory of models, a repository of quality checked test cases for model evaluation and documentation to orient the user. Best practice guidelines are built from model intercomparison benchmarks with different levels of complexity.

V&V benchmarks are typically developed in the frame of a research project. Windbench offers hosting for a project space from which test case (experiment description) and benchmark (model intercomparison) instances are produced. Contents in windbench can be open-access or restricted by access control ruled by an associated manager.   

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