## 封闭空间内自然对流的数值模拟

Title        Numerical simulation of natural     convention in enclosed space
Abstract
Natural convention problem in a closed space is of great value in academic research and engineering application. As a simple cavity flow problem, it is the standard example to verify many different calculation methods.The research status of natural convection in a closed square cavity was described briefly . A laminar flow model was applied and a non-uniform grid was generated in Gambit software. By changing the closed cavity boundary condition, the natural convention in different conditions were given through the numerical simulation. Under different boundary temperatures, different temperature differences and a number of different Ra, the velocity contours, temperature contours and streamlines patterns were drawn. Comparison of natural convention between whether radiation was considered was presented and then the function of Ra and Nu was stimulated.

Keywords   Natural convention  Enclosure  Numerical simulation
Radiation

1  绪论    1
1. 1  课题研究背景及意义    1
1. 2  国内外研究现状和分析    2
1. 3  计算流体力学研究方法    3
1. 4  本文的主要工作    3
2  理论基础    5
2. 1  自然对流换热理论    5
2. 2  辐射理论    5
2. 3  自然对流换热流动控制方程    7
2. 4  数值离散方法    8
3  模型的建立及计算分析    10
3. 1  自然对流换热模型的建立    10
3. 2  计算结果及分析    11
3. 3  不同边界条件对自然对流的影响    12
3.3.1  不同边界温度差    12
3.3.2  不同边界温度    13
3.3.3  下壁面有温度时对自然对流的影响    14
3.3.4  不同长宽比对自然对流的影响    16
3.3.5  不同Ra数对自然对流的影响    17
3. 4  Ra数与Nu数的关系    18
3.4.1  Nu数的定义    18
3.4.2  数值模拟结果及分析    18
4  涉及辐射换热的自然对流    20
4. 1  利用Rosseland辐射模型进行求解    20
4. 2  利用DTRM辐射模型进行求解    21
4. 3  利用DO辐射模型进行求解    23

1  绪论
1. 1  课题研究背景及意义 封闭空间内自然对流的数值模拟:http://www.lwfree.cn/wuli/20180109/18932.html
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