Butterfly wind analysis results on a complex terrain

[diego11ruiz]

Hi, I`m trying to get the wind field on a complex terrain with butterfly in grassshopper. The analysis seems correct, but the value of velocity obteneid at the “_ref_wind_height” with the “Vector Length” component is different than the velocity of the “_wind_vector” input for the “Butterfly_Create Case from Tunnel”. I don´t understan why the velocity at this z is so different than my input velocity.

Here is my grasshopper definition:

The results points and vectors have been internalized to avoid having to perform wind analysis multiple times.

[diego11ruiz]

and this is the wind results at “_ref_wind_height”:

My input for the wind vector is (0,-5,0), and the “_ref_wind_height” = 100 m, and the Rhino document (.3dm) is in meters.