GGSD Program Details for VS2DI

VS2DI

Category	Contaminant transport (2D FD)
Publisher	US Geological Survey
Platform	Win3x
Status	Public domain
Description	VS2DI is a graphical software package for simulating flow and transport in variably saturated porous media. It consists of three components: VS2DTI, for simulating fluid flow and solute transport. VS2DHI, for simulating fluid flow and energy (heat) transport, and a standalone postprocessor, for viewing results saved from previous simulation runs. Both VS2DTI and VS2DHI combine a graphical user interface with a numerical model. Users can specify or change the model domain, hydraulic and transport properties, initial and boundary conditions, grid spacing, and other model parameters. Simulation results can be displayed as contours of pressure head, moisture content, saturation, concentration or temperature, and velocity or flux for each time step. The numerical models used for flow and transport calculations are the USGS VS2DT (for solute transport) and VS2DH (for energy transport). VS2DT is a finite difference model that solves Richard's equation for fluid flow, and the advection-dispersion equation for solute transport. The model can analyze problems in 1D or 2D using either cartesian or radial coordinate systems. Relations between pressure head, moisture content, and relative hydraulic conductivity may be represented by functions developed by van Genuchten, Brooks and Corey, Haverkamp and others, or by data points. Initial hydraulic condition can be specified as static equilibrium, specified pressure head, or specified moisture content. Boundary conditions include specified pressure or total head, specified flux, infiltration with ponding, evaporation, plant transpiration, and seepage faces. Solute transport processes include advection, dispersion, first order decay, adsorption, and ion exchange. VS2DH is a version of VS2DT that has been modified to simulate energy transport instead of solute transport.
Cost	Free on WWW
Data formats supported	None stated
Supplier in United States of America	US Geological Survey