Recompile DISCON.f90 file

Wind & Water Computer-Aided Engineering Software Tools
1

Hello,

I’m trying to learn how to modify the DISCON.f90 file. As a start, I have tryed to change only the power from 5MW to 8MW, but the problem is that I cannot recompile the file to create a “.dll” file because I don’t have neither gfortram or Visual Fortran.

Is there any free software with which I could recompile the “.f90” file to “.dll”?
I have never worked with Fortran and I don’t know how to deal with this.

Thank you all in advance,

2

You will need a Fortran compiler if you want to make changes to source code. gfortran is free, so if you don’t want to pay for something, I suggest you use that one. If you’re on Windows, you can download the MinGW binaries of gfortran (and other compilers): mingw.org/

3

Thank you very much for your help, I will try to download a Fortran compiler from that link.

4

Hello,

I’m trying to recompile the file DISCON.f90. I downloaded gfortran and I used the following command:

$gfortran -c DISCON.f90

And I found the following error:

SUBROUTINE DISCON_sub ( avrSWAP, aviFAIL, accINFILE, avcOUTNAME, avcMSG ) BIND (C, NAME=‘DISCON’)
^
gfortran: error trying to exec ‘as’: execvp: No such file or directory

Could someone help me with this error? I just want to recompile DISCON.f90 to create a .dll file.

Thank you all in advance,
regards

5

In the compiling directory of the FAST v8 archive is a makefile you can use to compile the DISCON dlls (see makefile_DISCON_DLL). Otherwise, you can just compile with some additional compiling options, such as: gfortran -shared -O2 -m32 -fbacktrace -ffree-line-length-none -x f95-cpp-input -C DISCON.f90

6

I have compiled the DISCON.f90 using the -m64 instead of -m32 compile option with the gfortran compiler, and now have a DISCON.dll. However, when I run the compiled DISCON with OpenFAST, it fails to find or load the file. Additionally, I have used the CompileDiscon.bat file to generate a 64 -bit DISCON.dll and have run into the same issue when attempting to run it with OpenFAST_x64.exe. Could one of the options be incorrect?

7

Dear Martin,

Is the path to the DISCON.dll you compiled set correctly in your ServoDyn input file (DLL_FileName)?

Do you have any trouble running OpenFAST with the compiled DISCON.dlls provided for Windows?

Best regards,

8

Jason,

I believe the path to be correct, and I have been using dll’s compiled via a CMake, VisualStudio, MATLAB2015B (32-bit) procedure. I have never used gfortran before to compile a 64-bit version, as the command string shown above does not work with -m32 option, but does with -m64 option. The compiling process seems to complete just fine, but openFAST is unable to utilize the file.

9

Dear Martin,

Do you have any trouble running OpenFAST with the compiled DISCON.dlls provided for Windows?

Best regards,