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

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