关键词: 　泄漏 , 　土壤颗粒 , 　多孔介质 , 　模拟 , 　等温线

Abstract: For the problem of oil leak in different soil particle diameter, using CFD simulation software to establish the soil porous media mid-stream solid coupled mathematical model of phase transitions. The simulation results show that before the leaking, the distribution of isotherms of the steady-state temperature field becomes the sharp of flat circle and the temperature lower from inside to outside. Meanwhile, this distribution does not have obvious changes in the different sizes of soil particles; after the leaking, the isothermal lines in the small particle diameter soil presented divergent patterns with reduction of the distribution from inside to outside. At the same time, with the leakage of oil flowing into the porous medium, the temperature gradient tended to be stable. In large particles soil, because of the low power of oil flow resistance, the change of water which exit in permafrost could happen faster, and the stochastic distribution of the isotherms of the divergent is more obvious. This situation destructed the stable temperature field more seriously.

Key words: 　Leakage , Soil particles , Porous media , Simulation , Isotherm