Fluent双圆柱绕流的传热数值模拟
毕业论文关键词 双圆柱 数值模拟 阻力系数 雷诺数 瑞利数
Title Numerical translation of flow past two cylinders with Heat Transfer
Abstract
Research on flow past a cylinder involves various subjects，such as the ocean
engineering, aerospace engineering, and industrial air dynamics. The flow past
two cylinders works quite differently from the single one. In this paper, the
software Fluent and the infinite element method are used to simulate and
investigate the flow field and Drag coefficient under various circumstances
including different Reynolds number and Rayleigh number, and different cylinder
arrangements. The flow flied of double cylinders in tandem arrangements is
investigated with Reynolds number 10, 100, 3900，10000,200000 and Rayleigh
number 107, 108, 109,respectively, the results of the time-average surface
Nusselt number are compared with the experiments. In addition, we consider the
effect of three arrangements of two cylinder includes tandem, side-by-side and
45 ° staggered on the flow field.
Keywords Double cylinder Drag coefficient Reynolds Numbers Rayleigh Number
目 次
1 绪论 . 1
1.1研究意义 . 1
1.2国内外双圆柱绕流数值计算研究现状 . 1
1.3圆柱绕流的基本概念——边界层分离和漩涡脱落 . 3
1.4 本文主要研究内容 6
1.5 本章小结 7
2 控制方程和计算模型 . 8
2.1控制方程 . 8
2.2计算模型 . 8
2.3计算域和网格划分 10
2.4边界条件 11
2.5本章小结 11
3 不同雷诺数（Re）下双圆柱绕流的流动与传热分析 12
3.1不同Re数对圆柱流场流态的影响 . 12
3.2不同Re数对圆柱CD阻力系数、CL升力系数的影响 . 15
3.3拟合Re数与Nu数关系式 16
3.4本章小结 18
4 不同Ra数下双圆柱绕流的流动与传热的分析 . 19
4.1不同Ra数对圆柱流场温度场的影响 . 19
4.2拟合Ra数与Nu数关系式 23
4.3本章小结 24
5 双圆柱不同排布方式对流动与传热的影响 25
5.1串列 25
5.2并列 29
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