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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.

Teaching Method

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

Learning Outcome

Following 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

Date/Time Duration Event Type Location Language Course Cost Registration
9:30 - 18:00
1 Days
8-Aug-24 to 8-Aug-24
Live Pune-IN English Subscription Only

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.

Virtual Classroom Session 1

  • Lecture 01 - Introduction to Fluent UDF  and Fluent Data Structure

Virtual Classroom Session 2

  • Lecture 02 - Compiling and Interpreting UDFs
  • Lecture 03 - Composing UDFs - DEFINE and Data Access Macros
  • Workshop 03.1 – UDF Basics:
  • Part 1: Wall temperature profile
  • Part 2: Energy source 
  • Part 3: Derived post-processing, 
  • Part 4: Output to text files

Virtual Classroom Session 3

  • Lecture 04 - User-Defined Memories and User-Defined Scalars
  • Workshop 04.1 - UDFs for a User-Defined Scalar
  • Lecture 05  Parallelizing Your UDFs
  • Workshop 05.1: Parallelization

Virtual Classroom Session 4

  • Lecture 06 - Workbench Parameters and UDFs
  • Lecture 07 - UDFs for Eulerian Multiphase Flows
  • Workshop 07.1: Modeling Uniform Fluidization in 2D Fluidized Bed
  • Lecture 08  - UDFs for the Discrete Phase Model (Optional)

Additional workshops

For module03

  • Position Dependent Porous Media
  • Sinusoidal Wall Temperature Variation
  • Temperature Dependent Viscosity

For module04

  • Calculation of Flow Uniformity
  • Modeling Effect of Sedimentation Concentration in a Secondary Clarifier using a UDF

For module08

  • Using a UDF to Control the Dynamic Mesh of a Flexible Oscillating Membrane