problem in runing linearization with aerodyn

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Posts: 6
Joined: Sun Mar 17, 2019 10:32 pm
Organization: Shanghai Electric Wind Power Group Co.,Ltd.
Location: China

problem in runing linearization with aerodyn

Postby Shijing.Xu » Thu Jul 11, 2019 1:37 am

Dear all,
I am trying to use OpenFast to linearize with the ElastoDyn, AeroDyn enable. However I encountered the following error:

Compile Info:
- Architecture: 32 bit
- Precision: single
- Date: Dec 05 2018
- Time: 14:55:05
Execution Info:
- Date: 07/11/2019
- Time: 15:17:55+0800

OpenFAST input file heading:

Running ElastoDyn.
Running AeroDyn.
Running AirfoilInfo.
Running BEM.
Running InflowWind.

FAST_InitializeAll:InitModuleMappings:ED_2_AD_TowerMotion:MeshMapCreate:CreateMotionMap_L2_to_L2:CreateMapping_ProjectToLine2:Found close value for node 94. (4.99752E-03 m)

Performing linearization at simulation time 0 s. (RotSpeed=9.92 rpm, BldPitch1=18.44 deg)

FAST_Linearize_T:FAST_Linearize_OP:AD_JacobianPInput:CheckLinearizationInput:Blade1, node 1:
residual is discontinuous or undefined because z%phi = 0.
FAST_Linearize_OP:AD_JacobianPConstrState:CheckLinearizationInput:Blade1, node 1:
residual is discontinuous or undefined because z%phi = 0.

FAST encountered an error at simulation time 0 of 1 seconds.
Simulation error level: FATAL ERROR

Aborting OpenFAST.

I wonder if anyone can help me? :?:

Posts: 4858
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO

Re: problem in runing linearization with aerodyn

Postby Jason.Jonkman » Sun Jul 14, 2019 9:30 pm

Dear Shijing.Xu,

We are aware of an issue in AeroDyn that prevents linearization when the local inflow angle (phi) equals zero, which usually occurs due to some unfortunate combination of tilt and precone angles, rotor speed, and wind speed. Until we fix this issue, usually linearizing at a slightly different time allows OpenFAST to linearize without error.

I hope that helps.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901

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