We investigate the flow mechanism of this conveyor in a horizontal configuration by a discrete element method (DEM), applying a periodic boundary and omitting the existence of fluid medium.
As for the coal-bed gas reservoirs with constant pressure boundary, the log-log pressure curves are horizontal lines and the log-log pressure derivative curves are falling rapidly in the late stage.
This model considers free surface boundary, flux boundary, horizontal flow barrier, well boundary, non-linear characteristics of soils and dynamic change of permeability coefficient with stress state.