Wind profile with mean, turbulence intensity and direction

[ArnoldTUB]

Hey everyone,

I want to create a wind profile with a specific mean velocity, direction and turbulence intensity that all may change over time (which I want to be able to control).
However, I haven’t found a clue on how to accomplish that.
My best guess is that I would have to provide an input file that has some data points. Do you happen to have such a file I could use as a template? Or how else would I accomplish my goals?

Best
Arnold

[hgopalan]

Geostrophic and ABL forcing lets you specify a table with changing wind speed and direction to generate the initial precursor data. The other option is the body forcing source term which lets you specify a height varying profile. You can also take a look at VelocityFreeAtmosphere forcing source term which adds a wind speed nudging to the momentum equation. Do you want to do something different from any of them?

[ArnoldTUB]

Hey @hgopalan, thanks for your quick response! I think ABLForcing.velocity_timetable is providing exactly what I want.
Can you please explain what kind of header is expected?

Documentation:

Note that the code expects there to be a single-line header at the beginning of the velocity timetable file; if no header exists, the first line of data will be ignored.

[hgopalan]

Take a look at this test precursor: https://github.com/Exawind/amr-wind/tree/main/test/test_files/abl_godunov_timetable

and the driven case: https://github.com/Exawind/amr-wind/blob/main/test/test_files/abl_godunov_forcetimetable/abl_godunov_forcetimetable.inp

[ArnoldTUB]

Perfect, thank you!