Why Choose FLAC2D?


  • Interactively create models from CAD files (DXF, STL), geometry sketching, or images
  • Automatic structured and unstructured mesh generation
  • Skinning to automatically identify model boundaries to set boundary conditions
  • Interactively assign groups, constitutive models, and properties/distributions
  • Built-in database to save/import/export material properties
  • Automatic stress initialization
  • Intuitive commands are easy to learn
  • Most UI interactions are automatically translated into commands, which can be saved to a datafile and re-used
  • Built-in help / command auto-complete
  • Advanced built-in text editor makes creating and running models simple
  • With Version 9’s common UI, seamlessly move between programs or easily couple to other licensed (or demo) Itasca software


  • Multi-threaded to utilize the full power of your computer for faster solutions
  • Multi-threaded FISH Lists and Operators to query or modify the model incredibly quickly, even while cycling
  • New Maxwell damping for 10-200x faster performance for dynamic models
  • FLAC2D plane-strain or axisymmetric models run up to 2-5x faster than equivalent FLAC3D models
  • New, faster implicit solvers for fluid flow and thermal calculations


  • Large-strain simulations to capture the full extent of model deformation
  • Mixed and Nodal Mixed Discretization (NMD) for accurate plasticity calculations
  • Includes over 20 built-in constitutive models for soil, rock, and concrete
  • Built-in liquefaction models P2P-Sand and NorSand with PM4Sand, PM4Silt, and UBCSAND liquefaction models coming
  • Advanced plotting tools to understand model results and for working with hundreds of plots on real projects
  • FISH, Itasca’s scripting language, provides you with unparalleled control over, and customization of, the model
  • Built-in Python 3.10 scripting includes SciPy for plotting, NumPy for computing, and Pyside for UI customization
  • Statistical generation tools for Discrete Fracture Networks (DFNs)


  • Highly customizable UI and modeling
  • All licenses permit two instances of FLAC2D to be run on the same computer
  • Store custom model data via “Extra” variables, for nearly all model elements, that can be read, written to, and plotted
  • Import and export any ASCII data format
  • Optional user-defined constitutive models (UDM) can be written in C++ using Visual Studio template


  • Plane-strain
  • Axisymmetric
  • Static stability
  • Dynamic (option) stability
  • Automatic factor of safety analysis (shear strength reduction method)
  • Back-analyze failure and calibrate forward-prediction
  • Service limit state (SLS) and ultimate limit states (ULS) based on displacements
  • Zone relaxation simulates gradual excavation for construction sequencing, , including out-of-plane excavation
  • Simulate material damage, and failure
  • Effective stress using conventional or complex pore pressure distributions
  • Fluid flow (single-phase)
  • Seepage and consolidation
  • Model ground support correctly with coupled ground-structure interaction (beams, cables, piles/rockbolts, and liners are available)
  • Simulate discontinuities (faults, joints, bedding planes, and construction boundaries) using interfaces; capture yielding or failure, shear displacements, opening, and closure along them
  • Static liquefaction
  • Dynamic (option) liquefaction

Latest News
  • 6th Itasca Symposium on Applied Numerical Modeling The next Itasca Symposium will take place June 3 - 6, 2024, in Toronto, Canada....
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  • Itasca International Inc. announces the nomination of its new CEO Itasca International Inc. announces the nomination of its new CEO ...
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  • Itasca has announced the release of FLAC3D v9 Itasca has announced the release of FLAC3D v9, an advanced continuum modeling tool for solving...
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Upcoming Events
13 Jun
URTeC 2023
The Unconventional Resources Technology Conference (URTeC) is a premier event focused on the latest science and technology applied to e... Read More
25 Jun
APCOM 2023
APCOM brings together both industry practitioners and academics to share ideas, innovations, and challenges.... Read More
25 Jun
ARMA 2023
The American Rock Mechanics Association invites you to its 57th U.S. Rock Mechanics / Geomechanics Symposium in Atlanta, Georgia, on 25... Read More