Detailed Features of SVFlux 2D

SVFlux implements a comprehensive list of features which are outlined as follows:

Simulation Features

• Steady-state analysis.
• Transient (time dependant) analysis.
• Saturated or unsaturated analysis.
• Customizable solutions through a modifiable governing partial differential equation.
• Flux sections may be placed at any location in the model to summarize water flow across a section.
• Water flow with time may be tracked across flux sections.
• Finite element analysis by the Galerkin method. The solver uses advanced features such as preconditioning of the convergence matrix as well as staging and automatic mesh refinement to achieve solutions with greater stability than any other software currently available.
• Solver runs on Red Hat Linux or Windows with support for hyper-threading and multiple processors.
• Anisotropic analysis.
• Anisotropic analysis at any angle.
• Plan view analysis.
• Axisymmetric analysis.
• Fully automatic mesh generation. Mesh generation may be limited by a maximum number of nodes or by a maximum specified error.
• Fully automatic mesh refinement. Mesh refinement is based on the relative error of the governing equation and therefore automatically locates critical zones. In a transient analysis a different mesh is generated for each time step. SVFlux is currently the only commercial groundwater package in the world to offer this feature. Read more about adaptive grid refinement in research published by Mansell, 2002.
• Fully automatic time-step refinement for transient analysis. The time-steps selected by the solver are independant of the plotting intervals selected by the user.
• Add contaminant transport analysis with our ChemFlux software.
• Perched or multiple water tables may be incorporated.
• Contour plots of pressure / head
• Vector plots of pressure / head

Model Design Features

• CAD style entry of geometry.
• Grid, snapping, and object snapping features available.
• Zooming, panning features available.
• Import AutoCAD DXF geometry and incorporate it directly in the model. The automatic mesh generation will automatically allign node points with line segment end points.
• Graphically assign boundary conditions.
• Head or flux boundary conditions may be specified as contants or free-form equations. Free form equations may be specified as a function of position or time (i.e. h=30+exp(t)*2.5)
• Review boundary conditions are implemented to determine the outcrop of the water table on downstream slopes.
• Tables of net flux data may be cut and pasted into SVFlux to act as boundary conditions. This feature allows modeling of flux boundaries where weather station data is available.
• Problems may be entered in Metric or Imperial units
• All aspects of all models are stored in a database which may be placed on a server. Multiple users may be "plugged in" to the same modeling database.
• Import soil-water characteristic curve or permeability data from the SoilVision software. The SoilVision database contains laboratory data on over 6000 soil-water characteristic curves, over 2500 ksat values, and over 400 unsaturated permeability curves.
• Region geometry may be cut and pasted into the model from tabular sources such as Excel.
• Initial water table for a transient analysis may be graphically drawn on the problem or imported as heads from a steady-state analysis.
• A central database of soil properties for all entered seepage problems is maintained. New problems may draw soils from existing problems.
• Problem geometry may be imported from existing problems.
• Existing problems may be saved under a new name in the database to allow quick generation of multiple scenarios.
• Colors or patterns of soil regions may be specified.
• Manual entry of region coordinate points.
• Lines may be added to model to force mesh refinement along a linear object.
• Internal boundary conditions may be set or node density specified along internal line objects.
• Sketch text or lines may be added to the model design.
• Graphical model design may be exported as a WMF or DXF file and/or printed.
• Bitmap or DXF geometry may be imported and layered behind model geometry to simplify model creation (version 3.0).
• High-end Linux solutions available supporting parallel processing.

Output Features

• Color contour plots of head, pore-water pressure, kx, ky, water storage, and volumetric water content. Custom color shadings may be specified.
• Plots may be zoomed to isolate any region of interest.
• Vector plots of gradients.
• Volume or water volume integrals may be computed over the entire problem or any particular region of interest.
• Mesh plots track mesh refinement.
• Plots of value versus time may be generated at any coordinate for the following values: head, pore-water pressure, kx, ky, volumetric water content, and water storage.
• Surface plots of any 2D variable over the problem region may be produced.
• Overlaying of plots may be performed. For example, vectors may be shown in Region 1 while contours of head may be shown in Region 2.
• Text and line art may be added to output.
• Graphical output may be exported to WMF, DXF, JPG, or BMP formats.
• Transient results may be animated.
• Plotting of flowlines.

Applications

• Unconfined flow.
• Infiltration / precipitation.
• Design of earth covers.
• Pond infiltration.
• Excess pore-water pressure build-up and dissipation.
• Seepage modeling involving geomembranes.
• Water and contaminant movement (with ChemFlux) in mine tailings and leach pads.
• Time-dependant water flow.
• Water (and contaminant) flow in the unsaturated (vadose) zone.
• Aquifer recharge.
• Dam seepage.

Documentation

The following manuals document the operation of the SVFlux software. The design of the software makes it simple to learn and use. Most users are able to learn how to use the software effectively to create 2D problems within 30-60 minutes.

• User's manual - documents specific operation of software.
• Tutorial manual - Step-by-step instructions guide the user through creation of 2D and 3D problems.
• Theory manual - documents the theory of the governing partial differential equations used in the solution of the seepage problem.
• Verification manual - benchmarks the SVFlux software against typical seepage problems published in texts, journal papers, or manuals from other software packages.

System Requirements

• SVFlux2D runs on Windows 95/98, NT 4.0, Me, 2000, and XP. The recommended minimum hardware configuration is a P266 with 128MB RAM and 35 MB hard disk space.