Model Design

  • 2D and 3D map support (ASCII, ESRI Shape, DXF, TIFF, JPG, PNG, ...)
  • Usage of map geometries in mesh design and parameterization
  • Georeferencing and general geoimaging in WGEO (license included)
  • Flexible automatic mesh generation based on sophisticated algorithms supporting local refinement
  • Boundary conditions of 1st, 2nd and 3rd kind as well as specific well boundary condition including multilayer wells
  • Physical constraints to boundary conditions
  • Regionalization from point data (Kriging, Akima, Inverse Distance Weighting, Linear 1-D)
  • Time-dependent material properties, boundary conditions and constraints

Simulation

General

  • Steady-state or transient simulation
  • Different time-stepping methods:
    • constant time steps
    • varying pre-defined time steps
    • fully automatic time-stepping procedure using predictor-corrector or aggressive target-based schemes
  • Different approaches for free surface calculations:
    • moving meshes
    • linearized relationship for the saturation vs. relative conductivity curve with residual water depth
    • fully unsaturated modeling
  • Automatic calibration tool on base of PEST (by J. Doherty)
  • Efficient control of the simulation process with customizable real-time diagrams for all important model results

Solvers

  • Newton and Picard iteration techniques for nonlinear problems
  • Fast iterative and direct solvers like PCG and Restarted-OR-THOMIN with powerful preconditioners
  • Alternatively algebraic multigrid solver (SAMG by K. Stueben)

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Display and Analysis

  • Interactive 3D rotation and zoom
  • 3D view of the model area (finite element mesh, boundary conditions, material properties, modelling results) with isolines, 3D isosurfaces, cross sections, streamlines etc.
  • 2D view with isolines, velocity vectors, background maps, etc. as a vertical cross section or horizontal projection

 

 

 

 

  • Particle tracking with isochrone markers
    • Steady-state or transient
    • 2D or 3D
  • Extensive export functions: vector graphics (ESRI Shape File, DXF, FEFLOW Plot File, ASCII), screendumps, data triplets/quads, diagram points, etc.

 

 

  • Analysis of results in every time step as well as differential operations
  • Comparison with reference data and distributions

 

 

 

 

  • Creation of mass and energy balances for the model area or parts of it using the 'budget analyzer'
  • Computation of flux through cross sections or single layers using the 'fluid flux analyzer'

 

 

 

 

 

  • Free FEFLOW Viewer for 3D visualization of FEFLOW model properties and simulation results

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Solute Transport

  • Linear (Bear-Scheidegger) or nonlinear dispersion
  • Sophisticated upwind techniques:
    • Streamline upwinding
    • Shock capturing
    • Least-square upwinding
    • Full upwinding
  • Parameter fitting for the sorption isotherms in FE-LMē (included)
  • Density-coupled modelling for concentration-dependent fluid density and fluid viscosity (e.g. for salt water intrusion problems)
  • Simultaneous modeling of heat and mass transport (thermohaline transport)
  • Forward or backward transport modeling (reversed flow field)

Single-species transport

  • Decay processes:
    • Reactions of 1st order
    • Michaelis-Menten reactions
    • Radioactive decay (decay chains) using an external module
  • Consideration of equilibrium sorption according to the
    • Henry
    • Freundlich
    • Langmuir isotherms

 Multi-species reactive transport

  • Arbitrary number of chemical species
  • Dissolved or sorbed species
  • Definition of arbitrary chemical reactions via reaction kinetics editor

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Heat Transport

  • Heat conductance and storage in the fluid phase
  • Heat conductance and storage in the matrix
  • User-defined heat transport parameters of fluid and matrix
  • Density-coupled modeling for temperature-dependent fluid density and fluid viscosity
  • Simultaneous modeling of heat and mass transport (thermohaline transport)

Modelling of Unsaturated Conditions

  • Consideration of variable saturation, i.e. unsaturated and saturated zones in one model
  • Different parameter models:
    • van Genuchten
    • Brooks-Corey
    • van Genuchten modified (variable m)
    • Haverkamp
    • Exponential
    • Linear
  • Different forms of Richards' equation
  • Consideration of capillary hysteresis
  • Parameter fitting for different parameter models in FE-LMē (inclusive)

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