Simulation error for IEA-scaled turbine

Wind & Water Computer-Aided Engineering Software Tools
1

Hi,

I am new to OpenFast & is still exploring. I tried to run the model from the location openfast-turbine-models/IEA-scaled/NREL-2.8-127/OpenFAST at master · NREL/openfast-turbine-models · GitHub

But got the following error.
Any help is highly appreciated.

OpenFAST input file heading:
Generated with AeroElasticSE FAST driver

Running ElastoDyn.
Nodal outputs section of ElastoDyn input file not found or improperly formatted.
Running AeroDyn.
AD15 Nodal Outputs: Nodal output section of AeroDyn input file not found or improperly formatted.
Skipping nodal outputs.
Warning: Turning off Unsteady Aerodynamics because UA parameters are not included in airfoil
(airfoil has likely has constant polars). (node 1, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 2, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 3, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 4, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 5, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 7, blade 1)
Warning: Turning off Unsteady Aerodynamics because UA parameters are not included in airfoil
(airfoil has likely has constant polars). (node 1, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 2, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 3, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 4, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 5, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 7, blade 2)
Warning: Turning off Unsteady Aerodynamics because UA parameters are not included in airfoil
(airfoil has likely has constant polars). (node 1, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 2, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 3, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 4, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 5, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 7, blade 3)
Running InflowWind.

FAST_InitializeAll:InflowWind_Init:Steady_ValidateInput: Horizontal wind speed (HWindSpeed) for
steady winds must be greater than zero.

OpenFAST encountered an error during module initialization.
Simulation error level: FATAL ERROR

Aborting OpenFAST.

Error
Error1060×751 26.8 KB

2

Dear Karthik,

It does not appear that the wind specification is valid in this model. Steady wind is selected via WindType = 1, but HWindSpeed = 0. Change HWindSpeed to a more meaningful wind speed.

Best regards,

3

Dear Jason,

Thanks a lot for getting back. It helps, the simulation was running but now I stumbled into another error.

Running ElastoDyn.
Nodal outputs section of ElastoDyn input file not found or improperly formatted.
Running AeroDyn.
AD15 Nodal Outputs: Nodal output section of AeroDyn input file not found or improperly formatted.
Skipping nodal outputs.
Warning: Turning off Unsteady Aerodynamics because UA parameters are not included in airfoil
(airfoil has likely has constant polars). (node 1, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 2, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 3, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 4, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 5, blade 1)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 7, blade 1)
Warning: Turning off Unsteady Aerodynamics because UA parameters are not included in airfoil
(airfoil has likely has constant polars). (node 1, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 2, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 3, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 4, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 5, blade 2)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 7, blade 2)
Warning: Turning off Unsteady Aerodynamics because UA parameters are not included in airfoil
(airfoil has likely has constant polars). (node 1, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 2, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 3, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 4, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 5, blade 3)
Warning: Turning off Unsteady Aerodynamics because C_nalpha is 0. (node 7, blade 3)
Running InflowWind.
Running ServoDyn.
Running ServoDyn Interface for Bladed Controllers (using Intel Visual Fortran for Windows, ).

FAST_InitializeAll:SrvD_Init:BladedInterface_Init:The dynamic library
/home/equon/WEIS/local/lib/libdiscon.so could not be loaded. Check that the file exists in the
specified location and that it is compiled for 64-bit applications.

OpenFAST encountered an error during module initialization.
Simulation error level: FATAL ERROR

Aborting OpenFAST.

When I checked the file NREL-2p8-127_ServoDyn.dat, I could see in the section below the path, “/home/equon/WEIS/local/lib/libdiscon.so” , should I change it some other path?

Also, Is the data in the Bladed Interface needed for OpenFast to run.

---------------------- BLADED INTERFACE ---------------------------------------- [used only with Bladed Interface]
“/home/equon/WEIS/local/lib/libdiscon.so” DLL_FileName - Name/location of the dynamic library {.dll [Windows] or .so [Linux]} in the Bladed-DLL format (-) [used only with Bladed Interface]
“NREL-2p8-127_DISCON.IN” DLL_InFile - Name of input file sent to the DLL (-) [used only with Bladed Interface]
“DISCON” DLL_ProcName - Name of procedure in DLL to be called (-) [case sensitive; used only with DLL Interface]
default DLL_DT - Communication interval for dynamic library (s) (or “default”) [used only with Bladed Interface]
False DLL_Ramp - Whether a linear ramp should be used between DLL_DT time steps [introduces time shift when true] (flag) [used only with Bladed Interface]
99999.0 BPCutoff - Cuttoff frequency for low-pass filter on blade pitch from DLL (Hz) [used only with Bladed Interface]
0.0 NacYaw_North - Reference yaw angle of the nacelle when the upwind end points due North (deg) [used only with Bladed Interface]
0 Ptch_Cntrl - Record 28: Use individual pitch control {0: collective pitch; 1: individual pitch control} (switch) [used only with Bladed Interface]
0.0 Ptch_SetPnt - Record 5: Below-rated pitch angle set-point (deg) [used only with Bladed Interface]
0.0 Ptch_Min - Record 6: Minimum pitch angle (deg) [used only with Bladed Interface]
0.0 Ptch_Max - Record 7: Maximum pitch angle (deg) [used only with Bladed Interface]
0.0 PtchRate_Min - Record 8: Minimum pitch rate (most negative value allowed) (deg/s) [used only with Bladed Interface]
0.0 PtchRate_Max - Record 9: Maximum pitch rate (deg/s) [used only with Bladed Interface]
0.0 Gain_OM - Record 16: Optimal mode gain (Nm/(rad/s)^2) [used only with Bladed Interface]
0.0 GenSpd_MinOM - Record 17: Minimum generator speed (rpm) [used only with Bladed Interface]
0.0 GenSpd_MaxOM - Record 18: Optimal mode maximum speed (rpm) [used only with Bladed Interface]
0.0 GenSpd_Dem - Record 19: Demanded generator speed above rated (rpm) [used only with Bladed Interface]
0.0 GenTrq_Dem - Record 22: Demanded generator torque above rated (Nm) [used only with Bladed Interface]
0.0 GenPwr_Dem - Record 13: Demanded power (W) [used only with Bladed Interface]

Best,
Karthik

4

Dear @Karthik.Prakash,

The file NREL-2p8-127_DISCON.IN listed as DLL_InFile in the ServoDyn input file appears to be an input file for v2.3 of the ROSCO controller. So, ServoDyn input DLL_FileName should point to your local copy of this ROSCO DLL. You can find precompiled DLLs of various ROSCO releases here: Releases · NREL/ROSCO · GitHub.

Best regards,

5

image
image1877×932 164 KB

can you explain how to read this file if outb is not output file for reading results then how to generate .out file ?

6

Dear @Muhammad.Irfan,

The OpenFAST output files with extension .outb are binary formatted and cannot be viewed with a text editor. Instead, NREL has provided MATLAB- and Python-based scripts (in the MATLAB Toolbox and OpenFAST Toolbox, respectively), that can be used to read the binary formatted files into memory.

(The advantage of binary files over text files is that they are roughly 1/4 the size.)

Best regards,

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