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What's New
See the release notes of the last and previous versions, with the necessary information on new features.
Release Notes: Altair® Flux® 2025.1
Flux 2025.1 is available with new features, corrections and improvements. It is a completely independent version. It is installed by default in its own directory. It can not be installed on top of Flux 2025 (overwrite installation is blocked).
Essential Information about Flux 2025.1

Welcome
User guide
The user guide gives information about principles and how to use Altair® Flux® 2026.
What's New
See the release notes of the last and previous versions, with the necessary information on new features.
- Release Notes: Altair® Flux® 2026
  Flux 2026 is available with new features, corrections and improvements. Flux 2026 is a major release.
- Release Notes: Altair® Flux® 2025.1.1
  Flux 2025.1.1 is now available with the following fixes. This is a full release (not a patch).
- Release Notes: Altair® Flux® 2025.1
  Flux 2025.1 is available with new features, corrections and improvements. It is a completely independent version. It is installed by default in its own directory. It can not be installed on top of Flux 2025 (overwrite installation is blocked).
  - Essential Information about Flux 2025.1
  - New features of Flux 2025.1
  - Improvements
  - Fixed Defects
  - About other software – supported version
    Supported versions of software whose coupling is possible with Flux
  - About protection and installation
- Release Notes: Altair® Flux® 2025
  Flux 2025 is available with new features, corrections and improvements. Flux 2025 is a major release.
- Release Notes: Altair® Flux® 2024.1
  Flux 2024.1 is available with new features, corrections and improvements. It is a completely independent version. It is installed by default in its own directory. It can not be installed on top of Flux 2024 (overwrite installation is blocked).
- Release Notes: Altair® Flux® 2024
  Flux 2024 is available with new features, corrections and improvements. Flux 2024 is a major release.
- Release Notes: Altair® Flux® 2023.1
  Flux 2023.1 is available with new features, corrections and improvements. It is a completely independent version. It is installed by default in its own directory. It can not be installed on top of Flux 2023 (overwrite installation is blocked).
- Release Notes: Altair® Flux® 2023
  Flux 2023 is available with new features, corrections and improvements. Flux 2023 is a major release.
- Release Notes: Altair® Flux® 2022.3
  Flux 2022.3 is available with new features, corrections and improvements. It is a completely independent version. It is installed by default in its own directory. It can not be installed on top of Flux 2022 and or Flux 2022.1 or Flux 2022.2 (overwrite installation is blocked).
- Release Notes: Altair® Flux® 2022.2
  Flux 2022.2 is available with new features, corrections and improvements. It is a completely independent version. It is installed by default in its own directory. It can not be installed on top of Flux 2022 and or Flux 2022.1 (overwrite installation is blocked).
- Release Notes: Altair® Flux® 2022.1.1
  Flux 2022.1.1 is available with corrections and improvements. It should be applied to an existing installation of Flux 2022.1.
- Release Notes: Altair® Flux® 2022.1
  Flux 2022.1 is available with new features, corrections and improvements. It is a completely independent version. It is installed by default in its own directory. It can not be installed on top of Flux 2022 (overwrite installation is blocked).
- Release Notes: Altair® Flux® 2022.0.1
  Flux 2022.0.1 is available with corrections and improvements. It should be applied as an upgrade to an existing installation of Flux 2022.
- Release Notes: Altair® Flux® 2022
  Flux 2022 is available with new features, corrections and improvements. Flux 2022 is a major release.
"How to" Documents
See a list of documents to understand how to use certain features.
Altair Flux Videos
Several youtube videos about how to use Altair Flux and several tip and tricks
Flux Supervisor
The Flux supervisor allows to run projects, examples, pythons scripts; to configure user preferences; to access tools...
Flux
Flux is a finite element software for low-frequency electromagnetic and thermal simulations. Both, 2D and 3D solutions are available...
Flux Skew
Flux Skew is a module dedicated to the analysis of rotating electric machines with skewing, allowing a straightforward geometric and physical description in 2D and the consideration of continuous or step skewing effects.
Material Identification
The Material Identification tool is based on the Altair Compose environment and allows determining from measurements the parameters and coefficients required to create a material in Flux.
Altair Material Datacenter (AMDC)
AMDC is a comprehensive material database maintained by Altair and partner suppliers of engineering materials. Ready-to-use, Flux-compatible models may be obtained directly from this database for a growing number of materials.
Material Manager
Flux has a material manager with its own material base.The user can create his own material base and import them into the Flux models to be studied.
Flux e-Machine Toolbox
FeMt is a application in Flux dedicated for Electric Machine which permits to compute and postprocess results like efficiency maps.
Flux Examples
See the lists of examples 2D and SKEW with all available documents, as well as all project and python files.
Flux in SimLab Examples
See the list of SimLab examples using the Flux and Mipse solvers, with all available documents, *.slb databases, and all script files.
Mementos
See a list of Memento documents to understand certain Flux features.
Macros
Flux proposes several macros enabling doing actions that are not yet implemented in Flux.
PyFlux Documentation (Beta version)
This documentation deals with the Jython script used in Flux and allows to understand the various structures of entities and functions, and use it in user scripts for example.
Flux installation guide
This document provides instructions for Flux installation on supported platforms.
Flux Starting Guide
Several short videos to start with Flux.

Since version 2026, Flux 3D and Flux PEEC are no longer available.

Please use SimLab to create a new 3D project or to import an existing Flux 3D project.

Please use SimLab to create a new PEEC project (not possible to import an existing Flux PEEC project).

/!\ Documentation updates are in progress – some mentions of 3D may still appear.

Essential Information about Flux 2025.1


Essential information about Flux 2025.1
In order to use the version, you need: Altair Units License file Version 25.0 Altair License Manager (ALM) Version 2025 Altair License Utility (ALMUtil) Version 2025
Flux 2025.1 is available for Windows and Linux OS: Windows 10 & 11 Red Hat Enterprise Linux 9.4 and CIQ Rocky Linux 9.4 Warning: In Flux PEEC, the Linux distribution does not support the MUMPS LU Preconditioner of the Compression solver for inductive computations. Please use a different Linux distribution or another preconditioner.
The Linux version is qualified with the Gnome Classic with X11 display server. It is highly advisable to use the Gnome Classic with X11 display server to run Flux on Linux.
Flux 2025.1 takes into account the feedback from several users, and around 23 customer issues have been fixed in this version.
Distributed computing with MPI is available in Flux for Windows and Linux and can be used with PBS. However, qualification on Windows cluster connected with InfiniBand has not been done and Linux clusters are highly recommended for parallel computing. (Supported version : Intel MPI 2021.12)
Minimum memory required: For Flux 2D: 8 GB of RAM For Flux 3D, Skew and PEEC: 12 GB of RAM