| PACKAGE ID: | 002019MNFRM00 SCHAFF |
| KWIC TITLE: | SCHAFF |
| AUTHORS: | M.L. Sorey, LBNL
M.J. Lippmann, LBNL |
| LIMITATION/AUDIENCE CODE: | UNL/UNL |
| COMPLETION DATE: | 08/07/2006 |
| PUBLICATION DATE: | 02/06/2006 |
| DESCRIPTION: | The SCHAFF (Slightly Compressible Heat and Fluid Flow) program was developed for numerical modeling of liquid geothermal systems involving natural convection and hot spring discharge. For one-, two-, or three-dimensional porous media, the single-phase fluid and heat transfer equations are solved interlaced in time, using an integrated finite difference method. The mathematical model describing the physical behavior of hot-water geothermal systems is used to analyze natural or cellular convection in permeable layers heated from below. |
| PACKAGE CONTENTS: | Media Directory; Software Abstract; Media includes: |
| SOURCE CODE INCLUDED? | N |
| MEDIA QUANTITY: | N |
| METHOD OF SOLUTION: | The model consists of a set of coupled partial differential equations for heat and mass transfer in porous media and an equation of state relating fluid density to temperature. Simultaneous solution of the flow and energy equations is accomplished by interlacing the solutions in time, first, assuming temperatures and fluid densities constant over an interval and solving for new fluid pressure and velocity distributions, then using the new pressure and velocity distributions to compute new temperature and fluid density distributions and so on. These equations are solved numerically using an integrated finite difference method which treats arbitrary nodal configurations in up to three dimensions. The concepts of fluid and thermal time constants as indicators of nodal response times and numerical stability limits is an inherent part of the numerical scheme. |
| COMPUTER: | MAINFRAMES |
| OPERATING SYSTEMS: | SCOPE 2.1 |
| SOFTWARE LIMITATIONS: | Requires approx. 30 seconds CP time to complete the sample problem on a CDC7600. |
| REFERENCES: | M.L. Sorey; Numerical Modeling of Liquid Geothermal Systems, Ph.D. Thesis, University of California, Berkeley, California (1975).
M.J. Lippmann; Preparation of Input Data for Program SCHAFF (preliminary notes) Lawrence Berkeley Laboratory (May 1976). |
| TIME REQUIREMENTS: | The program requires approx. 110K words of central memory for execution. Standard system input and print and punch output units are required along with units for temporary storage of two tape or disk files. |
| ABSTRACT STATUS: | Released As-Is 3/9/2007 |
| KEYWORDS: | equations of state, finite difference method, fluid flow, geothermal systems |
| SPONSOR: | NEA |
| RESEARCH ORG: | Nuclear Energy Agency |
| PACKAGE TYPE: | AS-IS |
| PACKAGE STATUS: | RDY |