摘要圆柱绕流是流体力学的经典问题之一，广泛存在于航空航天、水利建筑、海洋钻井等科学研究和工程实践领域。圆柱绕流周期性的涡旋脱落可能会引发涡激振动现象，对工程实践产生重大的破坏作用，因此越来越多的学者重视圆柱绕流涡旋生成与脱落问题研究。本文对圆柱绕流的数学模型、物理模型以及相应的特征参数做了明确的介绍，还对目前兴起的能量梯度法做了简介。然后利用FLUENT软件对不同雷诺数下的圆柱绕流进行了数值模拟，并得到了相应的速度等值线图、静压等值线图、流线图等。首先应用了ICEM建立模型，并将模型进行网格划分，划分成了非线性网格结构。然后把模型导入到FLUENT中进行数值计算。FLUENT求解器采用有限体积法对流体力学控制方程离散的N-S方程进行离散，并用SIMPLEC方法求解。通过模拟的结果，分析了圆柱尾涡的运动和脱落情况，升阻力系数值得变化，并与已有的实验结果进行比较，给出了较为准确的分析研究结果，验证了数值求解的可靠性。87656

毕业论文关键词  CFD、圆柱绕流、数值模拟、尾涡脱落、升力系数、阻力系数

毕业设计说明书外文摘要

Title    Numerical simulation of flow around a circular cylinder based on CFD                     

Abstract Circular cylinder flow is one of the classical problems in fluid mechanics, and it is widely used in the fields of scientific research and engineering practice, such as aerospace, water conservancy construction, ocean drilling and so on。 Vortex shedding from a circular cylinder may cause the vortex induced vibration, which will cause a great damage to the engineering practice。 Therefore, more and more scholars pay attention to the research on the generation and shedding of the vortex。 In this paper, the background and significance of the research on the numerical simulation of CFD flow around a circular cylinder are introduced。 The mathematical model and physical model of the flow around the cylinder and the corresponding characteristic parameters are introduced。Also made a brief introduction to the current energy gradient method。Then, the flow around a circular cylinder at different Reynolds numbers is simulated by using FLUENT software, and the corresponding velocity contour map, static pressure contour map, streamline diagram, etc。 are obtained。Firstly, the ICEM model is established, and the model is pided into a grid structure。 Then the model is introduced into FLUENT to carry out numerical calculation。FLUENT solver uses the finite volume method to discrete the governing equations of fluid dynamics, and SIMPLEC method is used to solve the N-S equation。 Through the simulation results, analysis of the motion of the cylinder wake vortex and shedding, lift and drag coefficient worth changes and the results were compared with the results of previous experiments and gives a more accurate analysis results to verify the reliability of numerical。

Keywords  CFD；Flow around a circular cylinder；numerical simulation；Vortex shedding； Lift coefficient； Drag coefficient；

目次

1。绪论 1

1。1基于CFD圆柱绕流数值模拟研究的背景与意义： 1

1。2国内外研究现状： 2

2。FLUENT软件概述 6

2。1 ICEM简介 6源-于,优+尔^论=文.网wwW.yOueRw.com 原文+QQ752.018766

2。2 FLUENT简介 7

3。 圆柱绕流的基本模型 12

3。1数学模型