陶瓷过滤管管壁内气体流动的LBM并行模拟

采用格子Boltzmann方法,编制并行程序,计算了陶瓷过滤管管壁内的流体流动,从微观角度对滤管多孔介质结构内的流动进行分析。以陶瓷过滤管管壁扫描电镜图片为基础,根据实际滤管的厚度,确定计算中的多孔介质结构。分析了无膜滤管微细通道内的速度及压力随入口参数的变化情况以及多孔介质结构对速度的影响,给出了压力沿滤管厚度方向的变化曲线;分析了有膜滤管内的流动情况,给出了压力变化曲线,由计算结果可知,滤膜压降占滤管压降的比例较大。对过滤管微孔结构内流动的研究,可为陶瓷过滤管的性能优化提供理论指导。

Parallel computing of gas flow through ceramic filter by using lattice Boltzmann method

Comparing with conventional CFD methods, the lattice Boltzmann method (LBM) is a more efficient approach to deal with flows in complex structures, such as porous media.Moreover, it is an ideal tool for parallel processing. LBM was used to simulate gas flow through ceramic filter.Two kinds of filters were analyzed, one was the filter without membrane, the other was the membrane filter.Porous media structures for simulation were generated based on scanning electron microscope images of the ceramic filter tube.For the small time scale and small spatial scale in this issue, huge calculation load was inevitable.In order to fulfill these requirements, parallel computing was used.For the ceramic filter without membrane, the velocity and pressure in pores under different conditions were analyzed, and the influence of pore structure on velocity was observed.The flow through the ceramic filter with membrane was also simulated.It is concluded that the pressure drop through the membrane accounts for a large percentage of the filter’s total pressure drop.