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Ansys CFX Customization

Course Overview

As with many other Ansys software products, it is possible to customize the operation of the Ansys CFX tools. There are two key reasons for doing this: Firstly, to extend the standard numerical models available within CFX, and secondly, to streamline the environment so as to make it more efficient for your specific application.

This course covers a range of skills and techniques for customizing CFX. Topics covered include the use of CFX Expression Language (CEL), and CFX Command Language (CCL). CCL can itself be controlled with embedded Perl, and user-generated models can be applied using User Fortran. The ways in which the software process can then be controlled using junction boxes and command files are presented. Parallel computing (or HPC) places some important considerations on customization, and these factors are also addressed in this course.


  • 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 CFX Getting Started course is required.
  • Experience with Ansys CFX is strongly recommended.
  • Some prior experience with a programming language, preferably FORTRAN, is essential. The introduction to FORTRAN itself is very firm during this course. 
  • For the workshops a supported FORTAN 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 Outcome

Following completion of this course, you will be able to:

  • extend the modeling capabilities of CFX and customize/automate the CFX workflow with the aid of:
    • CEL and CCL
    • User functions & user routines
    • Embedded Perl

 Available Dates

Currently, no training dates available

Learning Options

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


This is a 2-day classroom course 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 CFX Customization   
  • Lecture 02: Introduction to CFX Expression Language   
  • Workshop 01: NACA airfoil, Lift and Drag forces 
  • Workshop 02: 1-D Interpolation for Inlet velocity

Virtual Classroom Session 2

  • Lecture 03: CFX Command Line Usage
  • Lecture 04: CFX Command Language (CCL)    
  • Lecture 05: Scripting and Automation
  • Workshop 03:  Scripting and Batch Processing 

Virtual Classroom Session 3

  • Lecture 06: Introduction to User Fortran
  • Demonstration:  Free Form User Fortran: Coding, Compiling, Setup 
  • Lecture 07: User CEL Functions  
  • Workshop 04: User CEL Inlet Profile

Virtual Classroom Session 4

  • Lecture 08:  Junction Boxes
  • Workshop 05: Timescale Modification
  • Lecture 09: Math and Utility Routines
  • Workshop 06: Setting a Wall Temperature Profile (Junction Boxes)  
  • Lecture 10: Parallel Fortran