A numerical simulator for 3-D unsteady-state dual-porosity modelling of gas flow within a coal structure
- CSIR Division of Minining Technology, Auckland Park (Australia)
The majority of existing models describing (methane) gas transport within, and liberation from, coal structures treat these as continua wherein two main gas flow modes (diffusive and Darcy permeable) prevail, and use finite difference techniques to generate solutions to the resulting multivariate parabolic partial differential equation(s). Isotropy and homogeneity in the physical and geometric coal structure properties are often assumed, and the existence of fundamental random fluctuations in these properties is not catered for. The model proposed herein does not suffer these inadequacies, and its efficiency is enhanced by the replacement of the diffusion equation by an accurate approximation. Dynamic mining activity, gas contributions made by the geology surrounding the mining seam, goafing of overlying strata and the effects of induced strain are all taken into account.
- OSTI ID:
- 269238
- Report Number(s):
- CONF-9506227-; TRN: 96:001467-0045
- Resource Relation:
- Conference: 7. U.S. mine ventilation symposium, Lexington, KY (United States), 5-7 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the 7th US mine ventilation symposium; Wala, A.M.; PB: 525 p.
- Country of Publication:
- United States
- Language:
- English
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