Update: New wake2e version 3.3

In the beginning of May we will release a new wake2e version (3.3). This version includes a couple of new features and it will serve as a basis for other new features which we will release in future versions.

There will be no change of the calculation method for the effective turbulence intensities. However, you may observe differences when running old projects with version 3.3. The reason is a change of the wind bin width from 2m/s to 1m/s. The frequency distribution of the wind speed related to a wind bin width of 1m/s is obviously slightly different from the one related to a broader wind bin width. But in most cases this will show no impact on the results.

If you prepare measured data which is a function of the wind speed as e.g. measurements of ambient turbulence intensities, this has to be done for a wind bin width of 1m/s within version 3.3. We will provide appropriate templates for Excel and LibreOffice. To avoid a new analysis of your measurements when running existing projects it will be possible to manually switch the wind bin width back to 2m/s.

More new features:

  • External wind data sets can be georeferenced. The different wind data sets will then be displayed in the map.

  • Results for the flow inclination are available.
  • The result file was arranged more clearly to ease interpretation and analysis. The different result parameters now appear in different sections:

    • One section for effective turbulence intensities.
    • One section for differences between design and calculated turbulence intensities.

    • One section for ultimate turbulence intensities.

    • Another section for data which is not a function of the wind speed.

Concerning projects in Germany there will be changes in the assessment of wind turbines having a type approval according to DIBt 1993/95. The result of the assessment will remain more or less the same, but the procedure will be modified.

The assessment will now be based on the design values of the DIBt 2004 which are a function of wind speed. The constant design value of the DIBt 1993/95 can still be compared to the related constant effective turbulence intensity, in case this leads to a contrary and positive assessment. Still it will remain a case-by-case review to decide whether the constant value gives reasonable results. This change of the procedure has two advantages. First, all wind turbines showing no exceedances according to DIBt 2004 will be assessed positively. Second, the case-by-case review will only be used to decide whether wind turbines showing exceedances may be assessed positively and not vice versa as it is current practice.

We hope that you will appreciate the new features and we are looking forward to your feedback.

Best regards
Your F2E-team