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MFIX2012-1 Release Announcement

Dear MFIX user,

We are pleased to announce the release of the new version of MFIX (MFIX2012-1). Please visit to download the latest version. Please see the release notes below that highlight the changes from the previous version.

Please send any software related questions to or administrative questions

MFIX Development Team

Changes from MFIX2010-1 (Date: 02/02/2010) to MFIX2012-1 (Date: 01/19/2012)

New features added:

  • DEM
    • DMP Parallelization (MPI)
    • SMP Parallelization (OpenMP)
    • Mass inlet and outlet boundary conditions
    • Heat transfer and DES reactive chemistry
    • Cohesion van der Waals force calculation with/without Rumpf corrections to asperities on surface of particles
  • Virtual mass
    • Virtual mass force acts to increase the inertia of the dispersed phase, which tends to stabilize simulations of bubbly gas-liquid flows
  • GHD (Garzo, Hrenya, and Dufty) granular kinetic theory
    • The GHD model solves mixture momentum and granular energy equations instead of the individual solids phases equations
  • Cartesian Grid cut cell technique
    • Partial slip boundary condition
    • K-epsilon wall functions
    • Energy equation
    • Geometry input from STL file and Gambit msh file (3D)
  • Quadrature method of moments (QMOM)
    • Solves moment transport equations for the particle phase [1]

Changes in existing features:

  • Bug fixes and enhancements:
    • Gfortran compilation: various format statement and line continuation were modified to accommodate gfortran
    • Chi scheme
      • Bug fix: ensure species mass fractions add to one
      • Enhancement: vanishing species no longer degrade the 2nd order scheme to FOU
  • Updated documents:
    • Readme file [2]
    • DEM documentation [3]
    • Cartesian grid documentation [4]
    • Summary of MFIX equations [5]

Under Development:

    • MPPIC: Multi-Phase Particle in Cell
    • Application of Cartesian cut-cell technique to DEM
    • Variable solids density


Project Metrics:

  • Change from 2010-1 Release:
    • 50 new files
    • Nearly 38,000 new lines of code (around 23,000 excluding comments and blank lines)
  • 2012-1 Total count:
    • Files: 519
    • Lines: 181092
    • Blank Lines: 23108
    • Code Lines: 107651
    • Comment Lines: 53285
    • Statements: 80529