1. General Model Information
Name: Heat- and Solute-Transport in 3 Dimensions
Acronym: HST3D
Main medium: terrestrial
Main subject: biogeochemical, hydrology
Organization level: ecosystem
Type of model: partial differential equations (finite differences,3D)
Main application:
Keywords: ground water flow, heat transport, solute transport, pollution, transient state, 3D, saturated flow, heat transport, single species solute transport, linear adsorption isotherms, first order decay, sink terms, finite difference numerics
Contact:
U.S. Geological Survey
Hydrologic Analysis Software Support Team
R. Steven Regan
437 National Center
Reston, VA 20192
email: h2osoft@usgs.gov
Author(s):
K.L. Kipp
Abstract:
The Heat- and Solute-Transport in 3 Dimensions program (HST3D)
simulates ground-water flow and associated heat and solute transport in 3D. The three
governing equations are coupled through the interstitial pore velocity, the dependence of
the fluid density on pressure, temperature, and solute-mass fraction, and the dependence
of the fluid viscosity on temperature and solute-mass fraction. The solute-transport
equation is for only a single solute species with possible linear-equilibrium sorption and
first-order decay. A restart option is available for storing intermediate results and restarting
the simulation at an intermediate time with modified boundary conditions. The basic
source-sink term represents wells. A complex well-flow model may be used to simulate
specified flow rate and pressure conditions at the land surface or within the aquifer, with
or without pressure and flow-rate constraints. Boundary-condition types offered include
specified value, specified flux, leakage, heat conduction, an approximate free surface, and
two types of aquifer-influence functions. All boundary conditions can be functions of
time. The program runs in batch mode. Input is developed by copying an example data
set and creating the new input file with a text editor. The program produces output files
with echo of input and results in tabular format.
II. Technical Information
II.1 Executables:
Operating System(s): DOS,UNIX,SUN download executables from USGS HST3D Home-Page
II.2 Source-code:
Programming Language(s): FORTRAN 77 download source code from USGS HST3D Home-Page
II.3 Manuals:
II.4 Data:
III. Mathematical Information
III.1 Mathematics
Finite-difference techniques are used to discretise the governing equations using a point-distributed grid. The flow-, heat- and solute-transport equations are solved, in turn, after a partial Gauss-reduction scheme is used to modify them. Two techniques are available for solution of the finite-difference matrix equations. One technique is a direct-elimination solver, using equations reordered by alternating diagonal planes. The other technique is an iterative solver, using two-line successive over-relaxation.
III.2 Quantities
III.2.1 Input
III.2.2 Output
IV. References
Kipp, K.L., 1986, HST3D: A computer code for simulation of heat and solute transport in three-dimensional ground-water flow systems: U.S. Geological Survey Water-Resources Investigations Report 86-4095.
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: T. Gabele: 07.07. 1998
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:44 CEST 2002