4.1.1 Location of the udf.h File

UDFs are defined using DEFINE macros (see Chapter  2) and the definitions for DEFINE macros are included in udf.h header file. Consequently, before you can interpret a UDF source file, udf.h will need to be accessible in your path, or saved locally within your working folder .

The location of the udf.h file is:

path $\backslash$ ANSYS Inc $\backslash$ v120 $\backslash$ fluent $\backslash$ fluent12.0. $\stackrel{\Downarrow}{x} \backslash$ src $\backslash$ udf.h

where path is the folder in which you have installed ANSYS FLUENT (by default, the path is C: $\backslash$ Program Files), and $x$ is replaced by the appropriate number for the release (e.g., 9 for fluent12.0.9).

In general, you should not copy udf.h from the installation area. The compiler is designed to look for this file locally (in your current folder) first. If it is not found in your current folder, the compiler will look in the $\backslash$ src folder automatically. In the event that you upgrade your release area, but do not remove an old copy of udf.h from your working folder, you will not be accessing the most recent version of this file.

You should not, under any circumstances, alter the udf.h file.