Numerical Simulation Of Microcosmic Seepage In Porous Media Based On N-S Equation

In this paper, N-S equation was introduced into the study of microcosmic seepage. The relationship of permeability of pore-scale porous media and microcosmic structure and permeability's calculation of dual-media and multiple-media were researched by numerical simulation based on fluid mechanics theory. By transaction of CT photo to construct a more true sandstone pore-scale structure model, flow in it was simulated. The main results are as following:The results of study on permeability of porous media composed by the same grain showed that the effect of shape of grain was inconsequential; grain diameter and porosity were determination factors. The Ergun equation was inaccuracy when the porosity was more than 0.7. A modified equation was presented in this paper.The results of study on permeability of dual-media showed that the equation presented by Kuwahara and Nakayam was inaccuracy when the porosity was bigger than 0.6. A modified equation was presented in this paper.An equation of permeability of multiple-media was presented by numerical experiments and theory analysis, which can match the experiment data well.The experiment approved that throats were the main factors of effecting permeability, and they were the main channels of flow, while pore space was mainly to reserve the fluid. The study on seepage of ceramics showed that coordination number can affect performance of seepage. The range of influence on pressure of flaw in ceramics was one time of size of ceramics grain on the vertical direction of flow while two time of size of ceramics grain on the parallel direction of flow.By transaction of CT photo to construct a more true sandstone pore-scale structure model, flow in it was simulated using fluid mechanics theory and mechanics of influence of microcosmic structure on seepage was studied.The research results above provid basic theory of design and seepage calculation of porous material, and provide technical support for analysis of mechanics of the microcosmic structure impacting the seepage.