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Ansys Fluent Using User-Defined Functions (UDFs)

Course Overview

User-defined functions (UDFs) allow you to customize Ansys Fluent and can significantly enhance its capabilities. The Ansys Fluent UDF training will provide you with the skills to make use of this powerful capability.


  • A technical education and background in fluid mechanics and heat transfer is recommended but not mandatory. An engineering degree is not required.
  • Completion of the Introduction to Ansys Fluent course is required.
  • Experience with Ansys Fluent is strongly recommended.
  • Experience running Ansys Fluent and some prior experience with a programming language, preferably a C-based language is essential. The introduction to C itself is very firm during this course. The focus is on the usage of Fluent macros embedded in a C program. UDFs are written in C90.
  • For the workshops a supported C-compiler is required. A text editor with user-defined syntax highlighting is recommended but not required.

Target Audience

Fluids Engineers, Combustion Engineers, Thermal Engineers and Aerodynamics Engineers

Teaching Method

Lectures and computer practical sessions to validate acquired knowledge.A training certificate is provided to all attendees who complete the course.

Learning Path


Learning Outcome

Upon successful completion of this course, you will be able to:

  • Learn the basic structure of UDFs 
  • Understand the different kinds of macros used to access solver variables
  • Be able to hook their UDF to most models that are available in Ansys Fluent
  • Be able to write UDFs for custom boundary conditions, source terms and material properties
  • Learn how to use UDFs to define input and output parameters and report definitions
  • Learn what is required to write UDFs to execute correctly in parallel
  • Learn necessary concepts and macros for applying UDFs in multiphase flow, including UDFs for the Discrete Phase Model (DPM)

 Available Dates

Time Duration Event Type Location Language Course cost Registration
May 25, 2021
10:00 - 17:00   KST (GMT +9)
1 Day
May 25
Live Seoul , South Korea Korean 368000  KRW REGISTER
May 26, 2021
10:00 - 17:00   JST (GTM +10)
1 Day
May 26
Virtual Virtual - WebEx Japanese 57000   JPY REGISTER

Learning Options

Training materials for this course are available with a Ansys Learning Hub Subscription. If there is no active public schedule available, private training can be arranged. Please contact us.


This course is a 1 day classroom covering both tutorials and workshops. For virtual training, this course is covered over 4 x 2 hour sessions, lectures only.

Day 1

  • Ansys Fluent Data Structure
  • Compilation and Interpretation of UDFs
  • Composing UDFs - Examples to Learn How to Use DEFINE and Data Access Macros
  • Workshop: Wall Temperature Profile
  • Composing UDFs - Examples to Learn How to Use DEFINE and Data Access Macros (continued)
  • User-Defined Memories and User-Defined Scalars
  • Workshop: Energy Source
  • Parallelization
  • Workshop: Parallelization
  • Workbench Parameters and UDFs
  • Eulerian Multiphase UDF Macros
  • Workshop: Derived Post-processing