Numerical Study On Pollutant Migration Process Of Buried Oil Pipeline Leakage

As a common porous media, namely soil bear the attack from pollutants, and as a delivery vehicle of pollutants cause more serious phenomenon of secondary pollution. Based on contaminant transport characteristics of porous media, by theory and numerical simulation of the pollutant migration process of buried oil pipeline leakage in porous media, to provide more in-depth theoretical foundation for the buried oil pipeline leakage detection technology, at the same time to provide a reference for crude oil contaminated soil remediation technologies practical application.In this paper, through the numerical simulation of fluid flow in porous media, analyze the role of soil porous media shape change; soil particles and glass beads in porous media influence situations of drag coefficient were discussed through test measures; through modeling and analysis on one-dimensional and multi-dimensional of the pollutant migration buried pipeline leakage, to discuss the migration characteristics on pollutant of buried oil pipeline leakage continuously injected; and according to the theory of lattice Boltzmann method using Chapman-Enskog expansion and multiscale techniques, established a D1Q3 model of one-dimensional equations to solve instantaneous and continuous injection about the pollutant of buried pipeline leakage, also conducted LBM(Lattice Boltzmann Method) simulation analysis.The results show that: the fluid obtained a large resistance to motion when pass through staggered particles; subjected to greater resistance effect through the smaller particle size, particle relatively large surface area of the porous medium;and relatively smaller pressure drop caused by a smaller inlet velocity of fluid.Water-white oil 32# mixed liquid flows through the porous medium particle size 0.8-0.9mm composed then viscosity resistance effect suffered less than by mixing particle size, the inertial resistance effect less than by mixing. Single phase water subject to greater viscosity resistance effect and small inertial resistance, under the same conditions the particle size. Water-white oil 32#-Air multiphase flow, white oil 32# bypassed the pipeline to migrate to the upper area, the volume fraction of white oil 32# increased the lower area of the leak opening. At different times, the numerical solution of LBM about the pollutant of buried pipeline leakage instantaneous and continuous injection of one-dimensional model with a good degree of matching the analytical solution. It provided a theoretical basis for studying on the pollutant migration process of buried oil pipeline leakage.