VAM2D: Variably saturated analysis model in two dimensions

Technical Report · Tue Oct 01 00:00:00 EDT 1991

DOI:https://doi.org/10.2172/6371576· OSTI ID:6371576

Huyakorn, P S; Kool, J B; Wu, Y S ^[1]

---

1. HydroGeoLogic, Inc., Herndon, VA (United States)

This report documents a two-dimensional finite element model, VAM2D, developed to simulate water flow and solute transport in variably saturated porous media. Both flow and transport simulation can be handled concurrently or sequentially. The formulation of the governing equations and the numerical procedures used in the code are presented. The flow equation is approximated using the Galerkin finite element method. Nonlinear soil moisture characteristics and atmospheric boundary conditions (e.g., infiltration, evaporation and seepage face), are treated using Picard and Newton-Raphson iterations. Hysteresis effects and anisotropy in the unsaturated hydraulic conductivity can be taken into account if needed. The contaminant transport simulation can account for advection, hydrodynamic dispersion, linear equilibrium sorption, and first-order degradation. Transport of a single component or a multi-component decay chain can be handled. The transport equation is approximated using an upstream weighted residual method. Several test problems are presented to verify the code and demonstrate its utility. These problems range from simple one-dimensional to complex two-dimensional and axisymmetric problems. This document has been produced as a user's manual. It contains detailed information on the code structure along with instructions for input data preparation and sample input and printed output for selected test problems. Also included are instructions for job set up and restarting procedures. 44 refs., 54 figs., 24 tabs.

• Research Organization: US Nuclear Regulatory Commission (NRC), Washington, DC (United States). Div. of Regulatory Applications; HydroGeoLogic, Inc., Herndon, VA (United States)
• Sponsoring Organization: USNRC; Nuclear Regulatory Commission, Washington, DC (United States)
• OSTI ID: 6371576
• Report Number(s): NUREG/CR-5352-Rev.1; ON: TI92003623
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
54 ENVIRONMENTAL SCIENCES
RADIOACTIVE WASTE DISPOSAL
RADIONUCLIDE MIGRATION
RADIOACTIVE WASTE FACILITIES
SITE CHARACTERIZATION
V CODES
BOUNDARY CONDITIONS
COMPUTER PROGRAM DOCUMENTATION
COMPUTERIZED SIMULATION
FINITE ELEMENT METHOD
FLUID FLOW
GROUND WATER
HYDROLOGY
LEACHING
MATHEMATICAL MODELS
NUMERICAL SOLUTION
SOILS
TRANSPIRATION
COMPUTER CODES
DISSOLUTION
ENVIRONMENTAL TRANSPORT
HYDROGEN COMPOUNDS
MANAGEMENT
MASS TRANSFER
NUCLEAR FACILITIES
OXYGEN COMPOUNDS
RADIOACTIVE WASTE MANAGEMENT
SEPARATION PROCESSES
SIMULATION
WASTE DISPOSAL
WASTE MANAGEMENT
WATER
052002* - Nuclear Fuels- Waste Disposal & Storage
053000 - Nuclear Fuels- Environmental Aspects
990200 - Mathematics & Computers
540230 - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- (1990-)
540330 - Environment
Aquatic- Radioactive Materials Monitoring & Transport- (1990-)