cause i have to use UDF and i have only the Fortran editon code, i wonder whether in fluent the udf can be in fortran? if not, can i using a simple c code inside which the fortran code is used?? please give me some advice!!! i am a newer here!!

the code can be written in Fortran as well according to UDF user guide. try a simple code in Fortran to see if it works. and then paste your entire code.

but the help says that the udf can only be written in C !!help!!!

For version 5 and above you'll need to use C, as per the manual. You may still be able to link some Fortran code if you want, but at least the code that interfaces with Fluent will need to be in C.

For versions 4 you need to use Fortran, but can link some C code into the executable.

Greg

You can link Fortran into Fluent 5 and 6 UDF. I have done that several times. The current appliation has ~10 000 lines of Fortran. You have to do some machine dependent modifications to makefile and write the interface in C, since you can not use the UDF macros in Fortran. There are a few things to note when linking C and fortran. E.g. array indices and parameter types.

Joakim

can you give me some details about it??thanks!!