Shapes of CFD mosaic and WRG

[Pablo Faúndez]

Hello,

I am making a big "mosaic" consisting of fifteen 2x2 km CFD tiles. The mosaic does not have a rectangular shape. Nevertheless, Windfarmer uses WRG files which are rectangular in shape.

Should I create within Wasp fifteen 2x2 km WRGs to feed into Windfarmer?

Or,

Will WAsP allow me to create a single rectangular WRG although not all the area will be covered with CFD results?

Additional info: All my turbines will be placed within CFD results area, which is guaranteed through appropriate windfarm boundaries set out within Windfarmer.

Thanks very much!    

[Morten]

Hi Pablo, 

The Terrain analysis (CFD) window can optimize this mosaic to cover all turbines and met stations by a minimum number of 2x2 km tiles. As you say, this will normally not result in an area of a rectangular shape.

WAsP allows you to generate one or several resource grids, and they may include areas with no CFD data. To see how this work, we can open the ParqueFicticio workspace, which is part of the WAsP sample data normally stored in ..\Documents\WAsP samples\WAsP 12\Wasp, import the associated CFD data and create a resource grid, which is larger than the area covered by CFD calculations as in the first screen dump below. If we export this to a WRG file, that file will include the grid nodes without CFD data and report zero in all result columns, see second screen dump.

I do not know how Windfarmer will react to a WRG file containing lots of zeros. To learn about best practice for CFD results in Windfarmer, I suggest that you consult the Windfarmer documentation or ask for their guidance. 

Good luck with your project!