I dot not have this link now, but in CFD online there are a well described tutorial to configure Fluent and all environments variables. You will need a SDK installation, the Visual Studio, and configure some environmenta variables to Fluent know where search the tools to compile your UDF. If you  follow the tutorial, you will be able to compile in the Fluent environment without use command lines, or theVS interface. Search in CFD on line data base. You will find it.

It turned out that my problem was not well understodd, hence my question was not well posed. :)

The actual problem was in fact that I was trying to link a 32 bit library in a 64 bit environment. Who could have guessed, based on the error message?

The method for linking static libraries (.lib) is to include the names of the .lib files in the linker command in the makefile.

E.g.:

     LIBS = cblas.lib

     link $(LIBS) /dll /debug /out:$(TARGET) $(OBJECTS) $(FLUENT_LIB) $(GPU_LIB)

The makefile is created when the build command is run from the ANSYS Fluent GUI (Define->User-Defined->Functions->Compiled). This makefile can be processed with your favorite compiler, using the make command (e.g. nmake for MS VS). The resuling .dll file can be loaded in ANSYS Fluent (Define->User-Defined->Functions->Manage). This even enables debugging in e.g. Visual Studio (by attaching the fluent process) by including the /debug flag in the linker command (see above) and adding /Od /Zi compiler flags.

Is the lib in 32bits pre-compiled before? I think that is not possible to run in a 64bits, or if is, some error must be arise in execution time. It can be the source of your error.But as I've said before, this workflow is not need. If the Fluent is properly configured  together with MS VS, SDK, and some Enviromental variables, you be able to compile through the interface directly. And the your library will be linked  automatically.  Fluent will call nmake command, compile, generate all objects, and dll, and you will see this library available in the interface, and its functions. 

Yes. The lib-files were precompiled 32 bit. And yes, that did not work. :) Replacing them with precompiled versions for 64 bit worked like  charm, however.

It might be possible to do the linking in Fluent, but then you need dll-files, I think. Also, running nmake from the command-line is necessary to enable debugging in MS VS SDK, as I have understood it.

Try this post and see if could be usefull to you

http://www.cfd-online.com/Wiki/Fluent_FAQ#How-To_Setup_Microsoft_Visual_C.2B.2B_10.0_to_Work_with_Fluent_13

Thank you, for the link, Ricardo.

The link describes very well the basic steps for setting up Visual Studio SDK, for compiling UDFs in Fluent, on a Windows system.

Dear Dr. Sverre,

Thank you for your post. It is really helpful.

I am struck up with similar issue.  I am using nmake (MS VS2010) to compile a UDF for Ansys Fluent 17.0 [64 bit]. Further, my UDF file calls functions from  static library (blas_win64_MT.dll, lapack_win64_MT. These libraries i copied from armadillio - stable version). I am able to link it succesfully and create a libudf.dll.

However when i load the UDF library folder libudf through ANSYS fluent(Define->User-Defined->Functions->Manage), i get a error message

Error:: Error code:126\n

Error Object: #f

Could not understand why ANSYS fluent could not load a library that is built.

-> Is it a library(LAPACK , BLAS) problem? . The UDF file gets loaded when compiled with nmake, if i do not include the below sample code

-> I am not sure whether i am missing anything here.

-> Any thoughts will be really helpful to me as i am struggling a lot on this :(

The sample code that i use in my UDF file is as follows:

#ifdef __cplusplus

   extern "C"

#endif

void dgesv_(const int *N, const int *nrhs, double *A, const int *lda, int *ipiv, double *b, const int *ldb, int *info);

void dgels_(const char *trans, const int *M, const int *N, const int *nrhs,

    double *A, const int *lda, double *b, const int *ldb, double *work,

    const int * lwork, int *info);

double A[9] = {76, 27, 18, 25, 89, 60, 11, 51, 32};

double b[3] = {10, 7, 43};

int N = 3;

int nrhs = 1;

int lda = 3;

int ipiv[3];

int ldb = 3;

int info = 0;

dgesv_(&N, &nrhs, A, &lda, ipiv, b, &ldb, &info);

Thank you in advance!

-Chris

Christober,

I suggest that you thest the static libraries in a stand-alone C-code before you try to run them inside fluent.

This will make debugging easier, and will definitely tell you if the precompiled static libraries are able to run on your computer architecture.

When you find out, please post your solution here. :)

Good luck!