AeroDyn Error: input values for DR not compatible

Wind & Water Computer-Aided Engineering Software Tools
1

Hi all,

I’ve been re-making the FAST files for the WindPACT project and I came across the following AeroDyn error: “Input values for DR(:slight_smile: are not compatible with input RElm(:).” It suggests changing my evenly-spaced elements to an alternating form:

[code] Input values for DR(:slight_smile: are not compatible with input RElm(:).
To make them compatible, please modify DR in the AeroDyn input file, .\WP3.0A02
V02_00000_AD.ipt,
as follows:

DR (Old) → DR (New)
3.1350 → 3.1250
3.1350 → 3.1450
3.1350 → 3.1250
3.1350 → 3.1450
3.1350 → 3.1250
3.1350 → 3.1450
3.1350 → 3.1250
3.1350 → 3.1450
3.1350 → 3.1250
3.1350 → 3.1450
3.1350 → 3.1250
3.1350 → 3.1450
3.1350 → 3.1250
3.1350 → 3.1450
3.1350 → 3.1250
Could not initialize AeroDyn.

Aborting FAST.[/code]

My full AeroDyn file is attached.

I checked my number calculations, (my tip radius is 49.5 m and my hub radius is 2.475 m), these element specs should be correct. Specifically, the values for RNodes were in the centers of each element, the edges of each element lined up with the next, the first edge of the first element is equal to my hub radius, and the ending edge of the last element equals my tip radius. Does anyone know what’s up?

Jenni
WP3.0A02V02_00000_AD.txt (2.87 KB)

2

Figured it out. I was using a Python script to automatically generate the FAST and AeroDyn files from a dictionary of my turbine, and I didn’t have enough precision in my hub radius so it was being rounded to 2.48 m in my FAST input file (attached). Silly me.

Here’s a quick list of things to check if you get this error:

  • RNodes[0] - DRNodes[0]/2 = HubRad from FAST file
  • RNodes[-1] + DRNodes[-1]/2 = TipRad from FAST file
  • RNodes[i]+DRNodes[i]/2 = RNodes[i+1]-DRNodes[i+1]/2 for all elements

Happy coding!

Jenni
WP3.0A02V02_00000.txt (18 KB)