摘要圆柱体绕流问题的研究涉及到海洋工程、航空工程、工业空气动力学等众多相关领域，其中圆柱体绕流的涡激振动以及自然对流问题对工程研究具有重要的意义。在不同的Re数和Ra数下，圆柱体绕流会产生不同模态。论文通过系统的分析不同Re数和Ra数及不同边界条件下，观察到圆柱绕流场的各种模态并揭示了绕流的传热输运特征。

本文从研究圆柱体的绕流入手，对流场的分布情况进行了详细的分析，并通过流体基本方程和传热基本方程对圆柱绕流场的数学模型进行了理论分析，结合Re和Ra的参数特征研究圆柱绕流场的基本流动和传热特征。本文采用FLUENT中湍流模型以及传热模型，通过数值模拟计算得到了不同Re数和Ra的圆柱体绕流场分布情况，得到了流场的速度，压力以及温度分布，建立了Re和Ra对应的Nu曲线。65190

毕业论文关键词：圆柱体绕流；FLUENT数值计算；二维模拟；Re雷诺数；Ra瑞利数；

毕业设计说明书（论文）外文摘要

Title  Numerical simulation of flow around cylinder with heat transfer

Abstract

Research on flow around cylinder is involved in ocean engineering, aeronautical engineering and industrial aerodynamics, as well as many other related areas, including the vortex-induced vibration of flow around cylinder and natural convection problem in engineering.Under different Re number and Ra number, the flow around cylinder could result in different mode. Through the analysis of different Re and Ra number as well as different boundary conditions, this thesis observed different modes and revealed the heat transfer mechanism of flow around cylinder.

This thesis started from research on the flow around a cylinder, and analyzed the distribution of flow field in detail, with the basic fluid equations, the flow field around a circular cylinder and heat transfer were investigated by different parameters Re and Ra. In this thesis, a turbulence model and heat transfer model were applied in FLUENT, through the numerical simulation the flow and heat field of flow around cylinders were given with different Re and Ra, then the Nusselt number curves v.s. Re or Ra was presented .

Key words: flow around cylinder; FLUENT simulation; Two-dimensional simulation; Re Reynolds number; Ra Rayleigh number.

目  录

1  绪论 1

1.1课题研究背景及其意义 1

1.2圆柱体绕流流场分析研究方法 1

1.3国内外研究现状 3

1.4本文的主要工作 4

2  计算流体力学理论 5

2.1圆柱绕流流场数值模拟理论 5

2.2湍流流动概述 6

2.3 Fluent 软件介绍 7

3 不同Re数圆柱绕流场分析 8

3.1 涡街产生的原因 8

3.2 FLUENT模型的建立 9

3.3 模型的各项参数设置及计算 11

3.4 计算结果及分析 13

3.5 本章小结 19

4  不同Ra和R e数圆柱体绕流对流传热 19

4.1对流传热理论分析 19

4.2不同Re和Ra数下传热对流FLUENT设置 20

4.4不同Ra时圆柱绕流对流传热数值模拟分析