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)
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
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-LM² (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
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-LM² (inclusive)