摘要
采用基于特征线的算子分裂(CBOS)有限元法对壁面驱动粘性不可压缩半圆形空腔流数值模拟研究.得到不同雷诺数下半圆形空腔流的流场达到稳定时速度分量沿x=-0.25和y=0.5的分布和流场中涡结构随雷诺数增加的变化情况.在较少的网格数和较大的时间步长下,达到稳定时的速度场计算结果与已有文献结果十分吻合.同时,捕捉到了流场中涡结构随雷诺数的变化,随着雷诺数的增加,在半圆形空腔中,涡结构越来越复杂,涡的数量也在上升.结果表明:CBOS有限元法采用非结构网格对具有曲线边界的半圆形流进行模拟时具有较高的精度和稳定性,能够很好地捕捉流场中涡结构随雷诺数的变化.
The characteristic-based operator-splitting(CBOS) finite element method is applied to simulate the wall-driven incompressible viscous flow in a semi-circular cavity at different Reynolds numbers. The velocity component and the streamlines are available. At less number of grids and a significant larger time step, the present results of the horizontal and vertical velocity profiles, respectively, along the vertical line x=-0.25and the horizontal line y=0.5 are in good agreement with the other numerical solutions. Especially worth mentioning here is the capture of the change of vortex structure. With the Reynolds numbers increase, the numbers of vortex also increase and the vortex structure becomes more complex. All the above shows that the CBOS finite element method is very effective on problems with non-orthogonal grid mesh.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2013年第10期1393-1398,共6页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金资助项目(41072235)
辽宁省自然科学基金资助项目(20102006)
关键词
CBOS有限元
算子分裂法
特征线
粘性不可压缩流
半圆形空腔
非结构网格
速度
涡结构
CBOS finite element method
operator-splitting algorithm
characteristic
incompressible viscous flow
semi-circular cavity
non-orthogonal grid mesh
velocity
vortex structure
