Introduction to UDF Concepts
This video aims to talk about User-Defined Function (UDF) Concepts. This lesson will give you a general introduction to the UDF and an overview of using UDF programming in ANSYS Fluent. This product is the first chapter of the UDF training course. We fully and comprehensively introduce you to UDF writing and its importance in Ansys Fluent software.
First, we teach how to run UDF in Fluent software. For this, you can use two methods:
Compiling
Interpreting
When you use UDF, there is a link between the UDF commands and the internal data of the Fluent software. So, we introduce a concept called Mesh Terminology. Therefore, we define concepts such as Mesh Components, Structure Data, Threads, Pointers, etc. To program UDF, we must use predefined Macros in Fluent Ansys. So, UDF can be classified based on the type of macros used.
In this training chapter, we introduce different types of commonly used macros. Some of them are:
General Purpose DEFINE Macros
Model-Specific DEFIENE Macros
Multiphase DEFINE Macros
Discrete Phase Model (DPM) DEFINE Macros
Dynamic Mesh DEFINE Macros
Each category has several examples of macros, and we introduce some commonly used examples. Then, we explain the use and function of each of these macros. Each of these macros consists of several arguments. We introduce each of these arguments and explain their function.
Some examples of general purpose macros category:
DEFINE_ADJUST
DEFINE_DELTAT
DEFINE_EXECUTE_AT_END
DEFINE_INIT
Some examples of model-specific macros category:
DEFINE_PROFILE
DEFINE_PROPERTY
DEFINE_SOURCE
DEFINE_PRANDTL
Some examples of multiphase macros category:
DEFINE_CAVITATION_RATE
DEFINE_EXCHANGE_PROPERTY
DEFINE_MASS_TRANSFER
Some examples of discrete phase model (DPM) macros category:
DEFINE_DPM_BC
DEFINE_DPM_DRAG
DEFINE_DPM_EROSION
Some examples of dynamic mesh macros category:
DEFINE_CG_MOTION
DEFINE_SDOF_PROPERTIES
DEFINE_GRID_MOTION
In the next section, we introduce some examples of additional macros:
Data Access Macros
Looping Macros
Vector and Dimensions Macros
Time-Dependent Macros