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MFiX 24.1 Release Announcement

Dear MFiX user,

We are pleased to announce the MFiX 24.1 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:

  • Glued Sphere Particle model: This is a variation of the DEM model, where spheres are assembled to create a non-spherical shape (glued sphere). If the energy equation is solved, intra-particle heat transfer is computed between component spheres [1].
  • New Non-Newtonian viscosity model (Herschel-Bulkley) [2].
  • Mass inlet ramps: New option to ramp up/down Mass Inlet Boundary Conditions parameters over time


  • Additional variables can be saved in the vtk files: viscosity, specific heats, particle volume
  • The Sutherland's law viscosity parameters can be specified as keywords
  • More accurate cohesive forces output to vtk files
  • DEM initial seeding that doesn't match the input parameters is now treated as a fatal error, prompting users to verify their settings

Notable bug fixes:

Fixed data check failure when particle count or inventory specified in an Initial Condition


[1] Lu, L. Q. G., X.; Shahnam, M.; Rogers, W. A. "Open source implementation of glued sphere discrete element method and nonspherical biomass fast pyrolysis simulation," Aiche Journal Vol. 67, No. 6, 2021, p. 14,

[2] S. Benyahia, "Simulation of heavy particles fluidized with non-Newtonian fluids", Powder Technology, Vol. 433, 2024,