1.4.1 Including the udf.h Header File in Your Source File

The udf.h header file contains definitions for DEFINE macros as well as #include compiler directives for C library function header files. It also includes header files (e.g., mem.h) for other ANSYS FLUENT-supplied macros and functions. You must, therefore, include the udf.h file at the beginning of every UDF source code file using the #include compiler directive:

#include "udf.h"

For example, when udf.h is included in the source file containing the DEFINE statement from the previous section,

#include "udf.h"

DEFINE_PROFILE(inlet_x_velocity, thread, index)

upon compilation, the macro will expand to

void inlet_x_velocity(Thread *thread, int index)

You do not need to put a copy of udf.h in your local folder when you compile your UDF. The ANSYS FLUENT solver automatically reads the udf.h file from the following folder after your UDF is compiled: path $\backslash$ ANSYS Inc $\backslash$ v120 $\backslash$ fluent $\backslash$ fluent12.0. $\stackrel{\Downarrow}{x} \backslash$ src $\backslash$ 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).