Study On Seepage Characteristics Of Soil Based On Lattice Boltzmann Method

Based on the lattice Boltzmann method to soil meso flow for the study of porous media in meso-scale structural features will be described using an intuitive method and reconstruction method. Using a random configuration, a four-parameter random growth method (QSGS), simulated annealing (SA) and other methods, to be reconstructed porous media to describe the morphological characteristics of the porous medium. On this basis, for the two-dimensional and three-dimensional porous medium build, the introduction of lattice Boltzmann method Micro-numerical simulation of seepage test, get inside the pores between soil percolation behavior and conventional percolation test results were compared. The results proved the validity and applicability of lattice Boltzmann method in the calculation of soil seepage areas. Under other conditions the same premise parameters, respectively, to change the porosity, pore structure, bounce boundary conditions, and other isotropic and anisotropic conditions, investigate the effect of various factors on the soil seepage. The results showed that:a single relaxation method (1) lattice Boltzmann method can be a good simulation of two and three dimensional seepage problems microscopic soil; (2) three soil reconstruction methods, the stochastic collocation method, and a four-parameter random growth method simulated annealing algorithm has its own advantages, to participate in a good simulation of seepage; (3) QSGS method can control variables are discussed under different conditions percolation phenomena; (4) based on three-dimensional four-parameter LBM Reconstruction of random growth method to simulate soil seepage, the introduction of the pressure boundary replacement velocity boundary, by the viscosity of a flow rate, pressure boundary conditions can be calculated permeability. (5) through a series of soil reconstruction method and a control variable, indicating that microscopic stochastic structure of the soil affect the existence of diversity factors permeability. Theoretical Study on flow direction of the lattice Boltzmann method has a good application, a reference value and theoretical significance of the seepage phenomenon actually works.