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MFiX 23.4 Release Announcement

MFiX 23.4 release

Dear MFiX user,

We are pleased to announce the MFiX 23.4 release. Please download the latest version. See the release note below that highlights the changes from the previous version.

Please visit the MFS forum for any software related questions, or send administrative questions to

The MFiX Development Team

New features:

  • New adaptive time step option (nice dt): The fluid time step is automatically adjusted during a simulation. Instead of specifying a constant factor to decrease/increase the time step, a new option constrains the time step to "nice" values (0.001, 0.002, 0.003 etc.).
  • Stiff solver tolerances can be set through new keywords (chemistry pane).
  • Particle mass and volume can now be saved in the vtp files.


  • More accurate DEM seeding (initial condition) when using Particle Size Distribution.
  • Treat compiler warnings as fatal when building mfixsolver.
  • Faster loading of large files in the GUI text editor.
  • [Windows] Added desktop icon and start menu entries for launching MFIX.

Notable bug fixes:

  • Fixed error when renaming a geometry element in GUI.
  • Fixed error when setting CGP statistical weight in GUI.
  • Fixed bug that was resetting DEM interpolation scheme to SQUARE_DPVM when loading .mfx file.
  • Fixed Floating point exception traps.
  • Fixed solver compilation issues on CentOS.