摘要
基于格子Boltzmann方法在计算流体力学方面具有程序易于实现、边界条件处理简洁、计算效率高、可得到清晰物理图像等优点,将其与D2Q9模型结合,采用非平衡外推格式的分布函数边界,建立单一光滑平板裂隙渗流模型,并结合经典流体力学的泊肃叶流算例,验证了模型的有效性。最后,分析不同压力差、不同隙宽对单一裂隙渗流量及流量稳定所需计算时步的影响,得出:单一裂隙渗流过程中,压力差或隙宽越大则该时刻下的渗流量越大,而渗流量达到稳定的计算时步与压力差和隙宽呈相反关系,即压力差与隙宽越大则其渗流量达到稳定所需计算时步越长。
Based on the lattice Boltzmann method in computational fluid dynamics, it has the advantages of easy implementation of the program, simple boundary condition processing, high computational efficiency, and clear physical images. Combining it with the D2 Q9 model, adopts the distribution function boundary of the non-equilibrium extrapolation format. A single smooth flat fracture seepage model is established, and combined with a Poiseuille flow calculation example of classical fluid mechanics, the validity of the model is verified. Finally, analyze the influence of different pressure differences and different gap widths on the seepage flow rate of a single fracture and the calculation time steps required for flow stabilization. It is concluded that in the process of single fracture seepage,the larger the pressure difference or the gap width, the greater the seepage flow rate at that moment.The calculation time step for the seepage flow to stabilize is inversely related to the pressure difference and the gap width, that is, the larger the pressure difference and the gap width, the longer the calculation time step required for the seepage flow to reach stability.
作者
董武书
张跃
DONG Wu-shu;ZHANG Yue(School of Architectural and Engineering,Kunming University of Science and Technology,Kunming 650500,China)
出处
《煤炭技术》
CAS
北大核心
2021年第1期82-85,共4页
Coal Technology
基金
昆明理工大学分析测试基金(2019M20182210025)。
