(color online) Escaping numbers of the methane in different particle configurations. Number of the methane gas permeating out of the blockage versus the simulation time in the typical pattern-1, pattern-2, and hydrophobic systems. t and n are the simulation time and the number of the escaping methane molecules, respectively. The blue, purple, and orange colors correspond to the results of pattern-1, pattern-2, and hydrophobic systems. Symbol and line are used to represent one typical result and the averaged result of these three systems, respectively.