2.2 General Purpose DEFINE Macros

The DEFINE macros presented in this section implement general solver functions that are independent of the model(s) you are using in ANSYS FLUENT. Table  2.2.1 provides a quick reference guide to these DEFINE macros, the functions they are used to define, and the dialog boxes where they are activated or "hooked'' to ANSYS FLUENT. Definitions of each DEFINE macro are contained in udf.h can be found in Appendix  B.

Table 2.2.1: Quick Reference Guide for General Purpose DEFINE Macros

Function	DEFINE Macro	Dialog Box Activated In
manipulates variables	DEFINE_ADJUST	User-Defined Function Hooks
time step size (for time dependent solutions)	DEFINE_DELTAT	Adaptive Time Step Settings
executes at end of iteration	DEFINE_EXECUTE_AT_END	User-Defined Function Hooks
executes at end of an ANSYS FLUENT session	DEFINE_EXECUTE_AT_EXIT	User-Defined Function Hooks
executes from a user- defined Scheme routine	DEFINE_EXECUTE_FROM_GUI	N/A
executes when a UDF library is loaded	DEFINE_EXECUTE_ON_LOADING	N/A
executes after a case file is read	DEFINE_EXECUTE_AFTER_CASE	N/A
executes after a data file is read	DEFINE_EXECUTE_AFTER_DATA	N/A
initializes variables	DEFINE_INIT	User-Defined Function Hooks
executes asynchronously	DEFINE_ON_DEMAND	Execute On Demand
reads/writes variables to case and data files	DEFINE_RW_FILE	User-Defined Function Hooks