上海交通大学学报

上海交通大学学报（自然版） ›› 2011, Vol. 45 ›› Issue (10): 1430-1434.

• 物理学 • 上一篇    下一篇

基于非结构网格的斜腔驱动流数值模拟

丁亮，王彤，谷传纲   

  1. (上海交通大学 动力机械及工程教育部重点实验室，上海 200240)
  • 收稿日期:2010-09-01 出版日期:2011-10-31 发布日期:2011-10-31
  • 基金资助:

    国家自然科学基金项目（50776056），国家高技术研究发展计划（863）项目（2009AA05Z201）

Numerical Study on Driven Skewed Cavity with Big Aspect Ratio Using Unstructured Grid

 DING  Liang, WANG  Tong, GU  Chuan-Gang   

  1. (Key Laboratory for Power Machinery and Engineering，Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2010-09-01 Online:2011-10-31 Published:2011-10-31

摘要： 为了分析大长宽比斜腔驱动流内部的流场结构，编制了基于非结构网格的二维CFD计算程序，主要包括：采用3次样条拟合边界点，使用阵面推进法生成非结构网格；采用Poisson方程解给出的结构化背景网格、Laplacian算子和对角交换技术改善生成网格的质量；利用同位网格上的压力加权插值算法避免压力速度失耦.通过对比等长宽比斜腔定常问题，验证了程序的有效性，发现在使用网格数仅为已有相关文献中的1/6的情况下，其结果与相关文献较吻合.对具有工业背景的长宽比为2的斜腔内流场进行了数值模拟与相应的分析，结果表明，斜腔驱动流中心线速度受雷诺数的影响较大，而受斜腔角度的影响相对较小；随着斜腔长宽比的增加，流场内的旋涡结构形式变化不大，只是中部旋涡的尺度增加.这些结果将有助于指导工业流动设备中类似结构的设计与加工.
 

关键词: 非结构网格, 大长宽比斜腔驱动流, 阵面推进法, 半隐式压力耦合算法

Abstract: The 2-D flow field of driven skewed cavity with big aspect ratio was numerically predicted using unstructured grids. Advancing front method was employed for the generation of unstructured grid. The smoothness and orthogonality of generated unstructured grid are improved by structured background grid, Laplacian filter operator and diagonal swap method. The program was first validated by steady lid-driven cavity problem with aspect ratio=1 and it is found that with only 1/6 grid number of reference, the simulated results are in good accordance with benchmark solutions. Then the driven skewed cavity with aspect ratio=2 and different skewed angles were solved. The results indicate that Re took more effect on center-line velocity distribution compared with the skewed angle. The main vortex structure in flow field varies little with just an extension of middle vortex scale. The results are meaningful for the design of similar structures in industry.

Key words:  unstructured grid, skewed cavity driven flow, advancing front method, semi-implicit pressure linked equation (SIMPLE)

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