Hazardous Waste Subsurface Storage Program. The model is designed to deal specifically with a complex situation where the flow of fluid groundwater is influenced significantly by variations in solute concentration or temperature. A wide range of boundary conditions can be accommodated including those involving water table conditions, infiltration, aquitard leakages, general head conditions, and pumping and injection wells. For energy transport simulations, heat conduction and storage in the fluid and rock matrix may be included. The code is delivered with complete documentation and user's manual.
Technical support is available.
The finite element method is employed to approximate the governing equations. A sequential solution strategy is used to handle coupled flow and transport problems. Spatial discretization is performed using rectangular or orthogonal curvilinear prism elements. Such elements are simple to work with and their matrices can be readily computed using efficient influence-coefficient formulas. Nonlinearity resulting from fluid density differences is handled via a Picard algorithm.