SPXCPL: twodimensional modeling program of selfpotential effects from crosscoupled fluid and heat flow, user's guide and documentation for version 1.0
Abstract
The program is applicable to the calculation of selfpotential effects due to fluid flow (electrokinetic effects) and heat flow (thermoelectric effects). The geological structure is two dimensional but the sources can be either finite line sources or point sources. The accuracy of the calculated potentials depends on the model discretization and the distance from the source(s). For the default mesh, the accuracy is usually a few percent at a distance of about one unit from the source. Surface boundary conditions for the primary problem require careful consideration as the form of the flow near the airearth interface can have a profound effect on the resultant electric potentials. For temperature problems the appropriate boundary condition is a constant temperature, which is taken as zero. With this boundary condition there is a normal flux of heat at the surface and there will be induced electrical sources here, if the surface medium has a nonzero coupling coefficient. In the models, zero temperature at the surface is produced by giving the air a very large thermal conductivity.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 March 1982
 Bibcode:
 1982STIN...8313400S
 Keywords:

 Computer Programs;
 Fluid Flow;
 Geological Surveys;
 Heat Transmission;
 Mathematical Models;
 Two Dimensional Models;
 Boundary Conditions;
 Boundary Layer Flow;
 Computerized Simulation;
 Geophysics;
 User Manuals (Computer Programs);
 Fluid Mechanics and Heat Transfer