3DFEMWATER: A three-dimensional finite element model of water flow through saturated-unsaturated media

Technical Report · Sat Aug 01 00:00:00 EDT 1987

DOI:https://doi.org/10.2172/5998824· OSTI ID:5998824

Yeh, G T

The 3DFEMWATER model is designed to treat heterogeneous and anisotropic media consisting of as many geologic formations as desired, consider both distributed and point sources/sinks that are spatially and temporally dependent, accept the prescribed initial conditions or obtain them by simulating a steady state version of the system under consideration, deal with a transient head distributed over the Dirichlet boundary, handle time-dependent fluxes due to pressure gradient varying along the Neumann boundary, treat time-dependent total fluxes distributed over the Cauchy boundary, automatically determine variable boundary conditions of evaporation, infiltration, or seepage on the soil-air interface, include the off-diagonal hydraulic conductivity components in the modified Richards equation for dealing with cases when the coordinate system does not coincide with the principal directions of the hydraulic conductivity tensor, give three options for estimating the nonlinear matrix, include two options (successive subregion block iterations and successive point interactions) for solving the linearized matrix equations, automatically reset time step size when boundary conditions or source/sinks change abruptly, and check the mass balance computation over the entire region for every time step. The model is verified with analytical solutions or other numerical models for three examples.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5998824
• Report Number(s): ORNL-6386; ON: DE87014955; TRN: 87-035054
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted. Environmental Sciences Division Publication No. 2904
• 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
54 ENVIRONMENTAL SCIENCES
GROUND WATER
FLOW RATE
NUMBER CODES
WATER SATURATION
GEOLOGIC STRUCTURES
MANUALS
MATHEMATICAL MODELS
POROUS MATERIALS
COMPUTER CODES
DOCUMENT TYPES
HYDROGEN COMPOUNDS
MATERIALS
OXYGEN COMPOUNDS
SATURATION
WATER
052002* - Nuclear Fuels- Waste Disposal & Storage
053000 - Nuclear Fuels- Environmental Aspects
510100 - Environment
Terrestrial- Basic Studies- (-1989)
520100 - Environment
Aquatic- Basic Studies- (-1989)