Determination of Time Step and Space Interval in Numerical Simulation of Gas Flow in Coal seams
Determination of Time Step and Space Interval in Numerical Simulation of Gas Flow in Coal seams
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Gao Jian-liang;Wu Jin-gang
中科院分区：
文献类型：
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作者：
Gao Jian-liang;Wu Jin-gang
The method for proper determination of the time step and space interval is studied.Calculation of the gas emission rate according to gas pressure distribution is analyzed when finite difference method is applied to simulate the gas flow in coal seams.When the gas pressure gradient between airway surface and the first node away from the wall surface in coal seam is used to calculate the gas emission rate,significant error may occur.It is suggested that gas pressure gradient on airway surface should be determined from the fitted gas pressure distribution curve in coal seam.It is more reliable and accurate to calculate the gas emission rate according to gas pressure gradient obtained from the fitted gas pressure distribution curve.The way to determine the suitable time and space interval is put forward by investigating the variation of gas pressure gradient on wall with several time and space intervals.
