Numerical simulation of 2D unsteady shear-thinning non-Newtonian incompressible fluid in screw extruder with fictitious domain method
Numerical simulation of 2D unsteady shear-thinning non-Newtonian incompressible fluid in screw extruder with fictitious domain method
复制标题
虚拟域法数值模拟螺杆挤出机内二维非定常剪切稀化非牛顿不可压缩流体
DOI：
10.1016/j.camwa.2016.11.005
复制
发表时间：
2017
影响因子：
2.9
通讯作者：
Bi Chao
中科院分区：
文献类型：
--
作者：
He Qiaolin;Huang Jinyang;Shi Xiaoding（施小丁）;Wang Xiao-Ping;Bi Chao
本文发展了一种带有分布式拉格朗日乘子的虚拟区域方法，用于模拟单螺杆和双螺杆挤出机内二维非定常剪切变稀非牛顿不可压缩流动。虚拟域法的优点是，即使流体域随时间变化(随着螺杆的旋转)，也可以使用固定网格，从而消除了重复重新划分网格和投影的需要。该方法在空间上使用有限元离散，在时间上使用算子分裂技术。给出了单螺杆和双螺杆挤出机内部流动的数值结果，表明虚拟域法是求解该问题的有效方法。
In this paper, we develop a fictitious domain method with Distributed Lagrange Multipliers for simulating 2D unsteady shear-thinning non-newtonian incompressible flow in a singlescrew and twin-screw extruder. The advantage of the fictitious domain method is that one can use a fixed mesh even as the fluid domain changes in time (as the screws are rotating), eliminating the need for repeated remeshing and projection. The method uses a finite element discretization in space and an operator-splitting technique for discretization in time. Numerical results are given for the flow inside a single-screw extruder or twin-screw extruder, which show that the fictitious domain method is efficient for the problem.