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MFIX2010-1 Release Announcement

Dear MFIX user,

We are pleased to announce the release of the new stable version of MFIX (MFIX2010-1). Please visit https://mfix.netl.doe.gov/members/download.php to download the latest version. Please see the attached release notes that highlight the changes from the previous version.

Please send any software related questions to mfix-help@mfix.netl.doe.gov or administrative questions toadmin@mfix.netl.doe.gov.

Regards,
MFIX Development Team

Changes from MFIX2007-4 (Date: 12/31/2007) to MFIX2010-1 (Date: 02/02/2010)

Changes in existing features:

  • Bug fixes and enhancements:
    • Solids inventory reporting problem for parallel runs
    • Unit conversion from CGS to SI for dimensional quantities.
    • Print format changes to accommodate processor counts > 100
  • Enhancements:
    • Semi-implicit treatment of IA conductivity term
    • Conducted extensive debugging and verification of the DEM code
    • Updated DEM test cases
  • Updated documents:
    • Equations document [1]
    • Readme file [2]

New features added:

  • HYS polydisperse drag model and test case
    • The Holloway, Yin and Sundaresan (HYS) drag relation accounts for the effect of finite Reynolds number on the fluid-particle drag experienced by particles in polydisperse suspensions.
    • The HYS drag model is described in mfix/doc/HYS_drag.pdf.
  • DEM
    • Expanded DEM code so particles of differing size and density can be modeled (polydispersity).
    • Added a second order integration method (Adams Bashforth) to DEM as an option (DES_INTG_METHOD).
    • Added the Hertzian collision model to DEM as an option (DES_COLL_MODEL).
    • Created an updated user guide/document for the DEM code that includes a discussion on theory, numerics, and the verification tests [3]
  • Cartesian Grid cut cell technique
    • This new capability allows the definition of curved or sloping boundaries, instead of the usual stair-step representation.
    • Computational cells are truncated at the wall to conform to the shape of the boundaries.
    • The Cartesian grid technique is available for the Euler-Euler approach and includes no-slip and free-slip boundary conditions for either gas or solids phases.
    • A user guide describing the utilization of the cut cell technique is located in mfix/doc/Cartesian_grid_user_guide.pdf [4].
    • Some tutorials located at mfix/Cartesian_grid_tutorials illustrate the new capability.
  • Distributed I/O
  • Option to compile using gfortran

Under Development:

    • GHD (Garzo, Hrenya, and Dufty) granular kinetic theory
      • Code was updated with GHD granular kinetic theory and a simple shear flow case was added to tests/GHD to show how this model is used.
      • The major difference between this theory and previous KT's that it solves mixture momentum and granular energy equations instead of the individual solids phases equations.
      • Currently this theory is for granular flows (no fluid) and only simple wall BC can be applied (i.e. no slip, free slip)
      • The effect of fluid-solid drag was included in the GHD theory.
    • DEM
      • Adding inlet/outlet capabilities to DEM

 

References

  1. S. Benyahia, M. Syamlal, T.J. O'Brien, "Summary of MFIX Equations", From URL
    https://mfix.netl.doe.gov/documentation/MfixEquations2005-4-4.pdf, August 2009.
  2. https://mfix.netl.doe.gov/documentation/Readme.pdf
  3. https://mfix.netl.doe.gov/documentation/dem_doc_2010.pdf
  4. https://mfix.netl.doe.gov/documentation/Cartesian_grid_user_guide.pdf
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