MFiX 25.2 Release Announcement

Dear MFiX user,

We are pleased to announce the MFiX 25.2 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 vog.eod.lten.xifm@nimda.

Regards,
The MFiX Development Team

New features:

• Multi-temperature range for specific heat definition (CHEMKIN format)
• New gas viscosity and thermal conductivity models:
  • Lennard-Jones model.
  • Cantera-based polynomial model.
  • Option to load Cantera transport data from file.
  • Plotting of viscosity and thermal conductivity profiles.

Improvements:

• New keyword kg_model to specify how the gas thermal conductivity is set.
  • CONSTANT: constant thermal conductivity (constant value set by k_g0 keyword).
  • AIR: air thermal conductivity is a function of temperature (default model).
  • LENNARD_JONES： Lennard-Jones model.
  • CANTERA_POLY: polynomial fit from species transport data using Cantera.
  • USR: user-defined thermal conductivity.
• Options to save the thermal conductivity of gas mixture using vtk_k_g.
• Options to save total GSP particle mass and GSP bounding diameter in vtp files.
• Turning off heterogeneous reactions that consume particles if the ratio of the particle mass to the minimum initial mass is below threshold des_min_pmass_frac (new keyword).
• Options to read multiple CHEMKIN mechanism files.
• Improved debug build option (enables array bounds checking, pointer and memory checks)
• Preview filtering of particle_input in Modeler pane.
• Control added for resolution of superquadric shapes in GSP model.

Notable bug fixes:

• Fixed bugs in GSP convection heat transfer.
• Fixed bug in pressure gradient calculation when using internal surfaces with DEM.
• Fixed bug in PIC parcel interaction with STL geometry.
• Fixed indexing error when using CALL_USR_SOURCE in solve_species_eq.f
• Fixed bug when reading solid reactions from CHEMKIN mechanism files for DPM models.
• Fixed bug with constant particle size from mass inflow in CGDEM.
• Improved plotting (constant data displays correctly).