期刊
JOURNAL OF HYDRODYNAMICS
卷 23, 期 1, 页码 55-64出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/S1001-6058(10)60088-1
关键词
four cylinders; spacing ratio; flow pattern; force characteristics
类别
资金
- Open Research Foundation of State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology [DMETKF2009016]
- Fundamental Research Funds for the Central Universities [2010-Ia-030]
A three-dimensional numerical investigation of cross-flow past four circular cylinders in a diamond arrangement at Reynolds number of 200 is carried out. With the spacing ratios (L/D) ranging from 1.2 to 5.0, the flow patterns can be classified into three basic regimes. The critical spacing ratio for the transition from narrow gap flow pattern to vortex impingement flow pattern around the cylinders is fund to be L/D = 3.0, while a single bluff-body flow pattern is observed at L/D = 1.2. The relationship between the three-dimensional flow patterns and force characteristics around the four cylinders shows that the variation of forces and Strouhal numbers against L/D are generally governed by these three kinds of flow patterns. It is concluded that the spacing ratio has important effects on the development of the free shear layers about the cylinders and hence has significant effects on the force and pressure characteristics of the four cylinders with different spacing ratios.
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