2.4 Multiphase DEFINE Macros

The DEFINE macros presented in this section are used for multiphase applications, only.

Table  2.4.1 provides a quick reference guide to the multiphase-specific DEFINE macros, the functions they are used to define, and the dialog boxes in which they are activated in ANSYS FLUENT. Definitions of each DEFINE macro are listed in the udf.h header file (see Appendix  C).

Appendix  B contains a list of general purpose DEFINE macros that can also be used to define UDFs for multiphase cases. For example, the general purpose DEFINE_PROPERTY macro is used to define a surface tension coefficient UDF for the multiphase VOF model. See Section  2.3.16 for details.

Table 2.4.1: Quick Reference Guide for Multiphase DEFINE Macros

Model	Function	DEFINE Macro	Dialog Box Activated
VOF	mass transfer	DEFINE_MASS_TRANSFER	Phase Interaction
	heterogeneous reaction rate	DEFINE_HET_RXN_RATE	Phase Interaction
Mixture	mass transfer	DEFINE_MASS_TRANSFER	Phase Interaction
	drag coefficient	DEFINE_EXCHANGE_PROPERTY	Phase Interaction
	slip velocity	DEFINE_VECTOR_EXCHANGE_ _PROPERTY	Phase Interaction
	cavitation rate	DEFINE_CAVITATION_RATE	User-Defined Function Hooks
	heterogeneous reaction rate	DEFINE_HET_RXN_RATE	Phase Interaction
Eulerian	mass transfer	DEFINE_MASS_TRANSFER	Phase Interaction
	heat transfer	DEFINE_EXCHANGE_PROPERTY	Phase Interaction
	drag coefficient	DEFINE_EXCHANGE_PROPERTY	Phase Interaction
	lift coefficient	DEFINE_EXCHANGE_PROPERTY	Phase Interaction
	heterogeneous reaction rate	DEFINE_HET_RXN_RATE	Phase Interaction