不可压缩SPH方法模拟非牛顿流边界设置  

Research on boundary treatment for using incompressible SPH method to simulate non-Newtonian flow

作　　者：董添文[1,2] 黄兴元[1] 江顺亮[3] 柳和生[2] 

机构地区：[1]南昌大学机电工程学院,南昌330031 [2]上饶师范学院物理与电子信息学院,上饶334001 [3]南昌大学信息工程学院,南昌330031

出　　处：《塑性工程学报》2012年第5期120-123,共4页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(50863003)

摘　　要：基于不可压缩SPH(ISPH)算法,针对螺杆挤出螺槽横截面内非牛顿流的计算,对镜像粒子法和静态粒子法两种边界设置方法进行研究。对比分析计算得到的速度场、粘度场、剪切应变率分布发现,使用静态粒子法计算的边界附近粒子的粘度场分布之所以不会剪切变稀,是因为剪切应变率计算的错误造成;而采用镜像粒子法则不会出现这种问题。该研究为不可压缩SPH方法在聚合物挤出加工模拟中的应用打下基础。Based on incompressible smoothed particle hydrodynamics （ISPH）, the non-Newtonian flow in the cross-section of the screw extruder was simulated. The mirror particles and dummy particles were separately used to treat the boundary. Comparing the velocities, the viscosity fields and the shear rate distributions obtained from two boundary treatments, it has been discovered that when using the dummy particles boundary method, the viscosity of the particles near the boundary did not show a shear thinning characteristic because that shear rate of these particles was not accurately computed. While using the mirror particles boundary method, the results were better. This research laid the foundation for using ISPH in the polymer extrusion processing simulation.

关 键 词：不可压缩SPH 螺杆挤出 非牛顿流 边界设置 

分 类 号：O242[理学—计算数学]