Numerical simulation of anisotropically reconstructed soil seepage based on improved QSGS-LBM method
In order to solve the defect that the reconstruction model generated by the traditional quartet structure generation set(QSGS)method is inconsistent with the real soil condition,an improved QSGS method is proposed.The anisotropic porous medium model was constructed by considering anisotropy,porosity and soil particle size,and then the validity of the reconstruction model was verified by the two-point autocorrelation function method.Combined with the lattice Boltzmann method,the Matlab automatic program was used to simulate the meso-seepage process.It finds that the maximum difference of the two-point correlation coefficient between the isotropic model and the CT scan slice is more than 2.5 times that of the anisotropic model.The seepage velocity of fluid particles at the middle line of the channel is the largest,and its value can be reach 0.03,while the seepage velocity at the wall of the channel is close to 0.It shows that the anisotropic model is closer to the real soil in pore structure and spatial distribution.Pore preferential flow and finger-in phenomena exists in the later stage of seepage.
meso-seepagemoisture migratireconstruction of soil modelattice Boltzmannquartet structure generation set
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