Hello,
I would like to use FAST for an inviscid case but my polars make an error because some lift coefficients are higher than 3.
Then I tried to delete in all my AeroData files the lines which have these problematic coefficients and I launched the program again.
A new error came:
FAST_InitializeAll:CheckRComp: RElm(17) produces ill-conditioned DR(
I checked my DR values but they seem to be ok, so I don’t know what makes the problem… The value 17 is my last section. Would you have an idea about what causes that?
Thank you very much in advance.
Dear Franck,
I’m not sure I understand your problem with the lift coefficient, but this seams to be unrelated to the problem with RElm and DR. For the latter, see our FAQ: nwtc.nrel.gov/FAQ#Nodes.
Best regards,
Thank you for your reply!
The problem is that I checked with my Aerodyn input file and the DRNodes seem to be ok… For a radius of 66 m:
RNodes DRNodes NFoil
2.00 4 1
6.00 4 2
10.00 4 3
14.00 4 4
18.00 4 5
22.00 4 6
26.00 4 7
30.00 4 8
34.00 4 9
38.00 4 10
42.00 4 11
46.00 4 12
50.00 4 13
54.00 4 14
58.00 4 15
62.00 4 16
65.00 2 17
Dear Franck,
Your RNodes and DRNodes look correct for the case where HubRad = 0 and TipRad = 66 in the ElastoDyn input file. Are HubRad and TipRad in ElastoDyn also correct?
Best regards,
Ah ok I didn’t think about the HubRad. Ok the simulation runs fine now, thank you!