PORFLO3: A mathematical model for fluid flow, heat, and mass transport in variably saturated geologic media: Users manual, version 1.0
Abstract
This manual provides instructions for the use of the PORFLO3 computer code. This computer code is based on mathematical formulation of fluid flow, heat transfer, and mass transport in variably saturated geologic media. The geologic medium may be heterogeneous and anisotropic and may contain linear and planar features such as boreholes and fractures. The code can be used to analyze 3D problems of partially as well as fully saturated media with various types of fluid, heat, and mass sources. PORFLO3 is written in American National Standard FORTRAN 77. A summary of the theory of PORFLO3 is provided. The 3 partial differential equations that govern fluid flow, heat, transfer, and mass transport and the method of their solution are discussed. The governing equations are discretized by the method of Nodal Point Integration and solved by any of the four alternate methods: Pointsuccessive Overrelaxation, Alternating Direction Implicit Scheme, Choleski Decomposition, and Gaussian Elimination. The structure of the code and the information flow between its 89 subroutines are explained. Certain practical suggestions for the design of the spatial grid and choice of time steps are discussed. The formatfree approach for data input is used in PORFLO3 is also discussed. Detailed instructions for data input are provided. Input and output for two example problems are shown along with error messages from PORFLO3.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 July 1989
 Bibcode:
 1989STIN...9010398R
 Keywords:

 Fluid Flow;
 Heat Transfer;
 Mass Transfer;
 Mathematical Models;
 User Manuals (Computer Programs);
 Computer Programs;
 Differential Equations;
 Flow Velocity;
 Ground Water;
 Radioactive Wastes;
 Underground Storage;
 Fluid Mechanics and Heat Transfer