Mesoscopic seepage field of saturated soil with lattice Boltzmann method
Shen Linfang1, Wang Zhiliang1, Li Shaojun2
1.Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; 2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
Abstract：According to the porosity of soil, the two dimensional porous structure of soil is established by using random allocation method. Based on Lattice Boltzmann method, the two dimensional model for simulating saturated soil seepage is constructed by setting the non-equilibrium extrapolation scheme at the inlet and outlet boundary, and the bounce-back scheme at the soil particles boundary as well as left and right boundary. The corresponding matlab program is programmed to simulate the velocity distribution of seepage field with constant soil porosity and inlet velocity. The results show that the velocity in the whole seepage area is relatively uniform in the process of seepage. The velocity is higher in the region of good connectivity and large porosity.The greater of the soil porosity, the higher of seepage velocity, and the majority of seepage velocity is lower than the inlet velocity. When soil porosity is constant, the higher of the inlet velocity, the wider of the distribution of seepage velocity. Therefore, lattice Boltzmann method could effectively simulate the seepage condition of soil and provide a new research approach for further study of seepage mechanism.
申林方, 王志良, 李邵军. 基于格子Boltzmann方法的饱和土体细观渗流场[J]. 排灌机械工程学报, 2014, 32(10): 883-887.
Shen Linfang, Wang Zhiliang, Li Shaojun. Mesoscopic seepage field of saturated soil with lattice Boltzmann method. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(10): 883-887.
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