渗流的PFC-CFD耦合细观数值模拟

A PFC-CFD coupled model in meso-scale for seepage

本文针对饱和多孔介质中渗流特点,在分析渗流连续介质力学模型的基础上,采用描述多孔介质中固相颗粒和液相流体耦合的细观力学模型,其中固相颗粒采用离散元的颗粒流理论(PFC)模拟,液相流体通过求解平均Navier-Stokes方程的计算流体动力学(CFD)技术计算,并利用建议的模型对二维渗流问题进行了模拟验证。数值模拟结果表明,采用PFC-CFD耦合细观力学模型能够描述从低雷诺流到高雷诺流范围很大的流体运动,可以用于多孔介质中的渗流问题分析。

Based on an analysis of the traditional continuum model for saturated porous media, a PFC-CFD coupled model was proposed to simulate the meso-scale pore water flow and micro-scale solid deformation of saturated soils. Particles were simulated by PFC^2D while fluid was simulated by solving the average Navier-Stokes equations. A brief verification was made in a two-dimensional case. The results indicate that the proposed model can simulate a wide variety of flow from low Reynolds number to high Reynolds number and can be used in geotechnical problems such as seepage.