FAST - Singular Matrix Error

Wind & Water Computer-Aided Engineering Software Tools
1

Hello,

I am trying to run Linux compiled version of FAST that contains my own PitchCntrl() function. After compiling with gfortran and parsing out some errors I am left with the following that I cannot seem to figure out:

[b]" Reading a 90x90 grid (90 m wide, 33 m to 123 m above ground) with a characterstic wind speed of
20 m/s. This full-field file was generated by TurbSim (v1.50, 25-Sep-2009) on 01-Feb-2013 at
14:06:09.
Processed 890 time steps of 20-Hz full-field data (44.45 seconds).
+
Singular matrix encountered.

Aborting FAST."[/b]

I would really appreciate tips on what might be causing this – I can supply my source code if that would be helpful.

Thank you in advance,
Nicholas

2

Hi, Nicholas.

I’m not the best person to answer your question, but I do know that the “Singular matrix encountered” error is generated by AeroDyn when it tries to invert a singular matrix for Generalized Dynamic Wake (GDW). Now you just need to figure out why the matrix is singular…