摘要
建立了三维粘性不可压非牛顿流体流动的控制方程,采用Level Set/Ghost/SIMPLEC方法模拟了注塑成型充模阶段的三维流动过程;追踪到了不同时刻的熔体前沿界面,预测并分析了流动过程中不同时刻的压力、速度等重要的流动特征参数,并与牛顿流体相应的流动特征参数做了对比。研究结果表明:Level Set/Ghost/SIMPLEC方法可以准确追踪非牛顿熔体前沿界面;幂律熔体在流动过程中的压差明显大于牛顿熔体的压差,沿横截面的速度分布也有明显的差别。
The governing equations are established for the viscous,incompressible,non-Newtonian fluids.The 3D level set equations are introduced,and the 3D flow process of injection molding is simulated by the Level Set/Ghost/SIMPLEC method,which can precisely capture the front surface of melt and predict the flow features such as pressure and velocity at different times.These flow features are compared with those of Newtonian fluids.The SIMPELC method is applied to the physical controlling equations.Moreover,the level set method is introduced for capturing the melt front and the ghost fluid method is used for coupling the free front with the physical quantities.The results indicate that the Level Set/Ghost/SIMPLEC method can capture 3D front surface of non-Newtonian melt precisely.The pressure difference of power law melt is significantly higher than that of Newtonian melt in the flow process.And the speed distribution of section also has obvious difference,which shows the flow behavior of the non-Newtonian fluids.
出处
《应用力学学报》
CAS
CSCD
北大核心
2010年第2期333-339,共7页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金重大项目(10590353)
国家自然科学基金(10871159)
国家重点基础研究发展计划(2005CB321704)
