Methane Modeling: Predicting the Inflow of Methane Gas into Coal Mines. Phase 2 - Small-Scale in-Mine Tests and Development of Two-Dimensional Models. Phase 3 - Final Report and Computer Source Codes. Volume 2. Computer Source Codes

摘要

A two-dimensional, numerical, mathematical model has been developed to predict methane influx into coal mines under a variety of mining conditions. A set of time-dependent, partial differential equations for two-phase Darcy flow in a porous medium was developed. One-dimensional models were expanded to two-dimensional models by appropriate geometric modification of the basic equation set. Numerical solutions were obtained with an implicit method-of-lines technique. Boundary conditions corresponding to the appropriate mining system can be selected. The model and solution procedure are coded in a structured dialect of FORTRAN and a preprocessor is included for adaptation to popular computer systems. To obtain data for comparison with the model, methane measurements were made in three coal mines in the Eastern United States to encompass a range of gas contents, porosities, permeabilities, coal rank, and mining methods. Volume II contains a guide to the computer program, flowcharts, and source codes.