齿状微裂隙气流和水流的LBM模拟  

LBM simulation of air and water flow in a dentation fracture

作　　者：王亚兰 季晓慧[1] 王旭升 WANG Ya-lan;JI Xiao-hui;WANG Xu-sheng(School of Information Engineering,China University of Geosciences(Beijing),Beijing 100083,China;School of Water Resources and Environment,Key Laboratory of Groundwater Circulation and Environmental Evolution(Ministry of Education),China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地质大学(北京)信息工程学院,北京100083 [2]中国地质大学(北京)水资源与环境学院地下水循环与环境演化教育部重点实验室,北京100083

出　　处：《水动力学研究与进展（A辑）》2019年第5期612-621,共10页Chinese Journal of Hydrodynamics

摘　　要：裂缝介质中的气流和水流运动是地质资源和能源开发面对的重要自然过程。粗糙裂隙的复杂形态在一定程度上改变了流体的运动路径,使得Darcy定律的适用性受到影响。实际粗糙裂隙结构复杂无序,单从实验的角度观测难度较大,该文采用格子Boltzmann方法对不同尺寸和凹槽比例的对称齿状微裂隙进行气流和水流模拟,分析了流场速度和流量的变化规律。模拟结果表明裂隙中发育一系列顺时针方向旋转的涡流,凹槽的比例不同对旋涡的形态和个数有较大的影响。旋涡的形成对流体流速分布也有影响,相比水流,气流旋涡的转速更快、中心点更高及顶部顺风坡更长。穿过裂隙断面的流量随压差的增加而增大,气流呈非线性关系,不满足Darcy流假设,而水流呈线性关系,满足Darcy流假设。该文方法可进一步用于其它规则形态的裂隙流。The air and water flows in fractures are important natural processes in the exploitation of geological and energy resources.To some extent,the complex shape of a rough fracture changes the path of the fluid,which affects the applicability of Darcy’s law.The actual rough crack fracture is complex and disordered,it is difficult to study from the experimental point of view.In this paper,the lattice Boltzmann method was used to simulate the flow of air and water in dentation fracture with different sizes and groove ratios,The flow velocity and flow rate were analyzed.The results show that clockwise vortexes are developed in the fractures and the difference in the proportion of the grooves has a large influence on the shape and number of the vortices.The vortexes affect the flow velocities distribution.Compared with the water flow,the air flow vortexes rotate faster with higher center points and longer windward slopes.With the increase of the pressure,the flows across the fracture increases,and the air flow is in a nonlinear trend and does not satisfy the Darcy flow hypothesis,while the water flow is in a linear trend andsatisfies the Darcy flow hypothesis.The method in this paper can be further applied to other regular shape fracture flow simulations.

关 键 词：微裂隙 格子BOLTZMANN方法 旋涡 Darcy流假设 

分 类 号：O357[理学—流体力学]