[SAM S]

I want to compile the udf for mass transfer source. I am not sure what is meant by source and header files separately.What should be the content of these two files, should I split the code into this.

Also I have another query, if source term not specified through udf then how will fluent compute the transfer process

[`e`]

The UDFs for Fluent are written in ANSI C and include header files at the top of the source files using the compiler directive (#include), for example:

#include "udf.h" // the header file required for UDFs

DEFINE_SOURCE(a_custom_source,c,t,dS,eqn)
{
    return 0.; // this example returns a zero source term
}

The header file (udf.h) is for Fluent and contains a list of definitions for the DEFINE macros amongst other important code.

The UDF source term is for additional source terms, more information can be found in the relevant section of the UDF manual. Fluent recommends that you should define a momentum source if you've defined a mass source for a cell zone.

[SAM S]

Thank you for the help. So I should save only the header i.e. #include "udf.h" in a .c file and load it for header files during compilation.

[`e`]

No, simply type the following line at the top of your UDF file (as shown in my example above):

#include "udf.h"

and compile then load your UDF file within Fluent: Define > User-Defined > Functions > Compiled...