柱群结构风致涡激振动的数值模拟分析和验证.pdf

Classified Index: TU973+.32 : 624 Dissertationfor the MasterDegree in Engineering ↑(Times New Roman 小2号字) NUMERICAL SIMULATION AND VERIFICATION OF VORTEX-INDUCED VIBRATIONS FORCYLINDER GROUP ↑(Times New Roman 2号字加粗,题目太长时可用小2号字) Candidate: Xing Tongliang Supervisor: Academic Degree Applied for:Master of Engineering Speciality: Civil Engineering Affiliation: Shenzhen Graduate School Date of Defence: June, 2012 Degree-Conferring-Institution:Harbin Institute of Technology (Times New Roman 4号字) 哈尔滨工业大学工学硕士学位论文-I- 摘要由圆柱群组成的结构群是现代工程结构实践中比较常见的一种排列方式,而针对此种结构方式在高雷诺数下的风致振动的研究成果并不多见。因此柱群结构的涡激振动问题无论对于理论研究还是工程实践都具有非常大的研究意义。本文针对正方形顺排排列四圆柱的柱群结构在高雷诺数下的风致涡激振动特性进行研究。通过CFD数值模拟方法,利用Fluent软件进行数值模拟计算;对风洞试验数据进行分析,再将数值模拟的结果与风洞实验的结果进行对比,验证数值模拟方法的可行性与正确性。本文的主要研究内容如下: (1)本文主要针对正方形顺排排列的四圆柱,应用Fluent流体分析软件建立数值计算模型,网格采用混合网格,模型采用SST湍流模型,对三种不同间距及在每种间距下各自对应不同风速的四圆柱风致涡激振动进行数值模拟研究,再对得到的圆柱体的风压力、振动响应和流场涡结构等情况进行分析,得出相关结论。(2)风洞试验数据主要包括在均匀来流的风洞试验中测得的不同间距及不同风速下的加速度、风压力及热线数据,把风洞试验数据做成图表曲线进行对比分析并解释实验现象。通过对高雷诺数下的数值模拟结果和风洞试验结果进行对比分析,对比在相同条件下涡激振动得到位移均值、幅值、质心轨迹等得出相关结论,验证数值模拟方法的正确性与可行性。关键词:圆柱群;CFD数值模拟;流固耦合;涡激振动;风洞试验哈尔滨工业大学工学硕士学位论文-II- Abstract The structure of cylinder group is mon arrangement in engineering practice now, but there is a little studying results in connection with vortex-induced vibrations of cylindergroup in the high Reynolds number conditions. So the studying of vortex-induced vibrations of cylindergroup is very meaningfulfor theoretical study and engineering study the vortex-induced vibrations of four fixed circular cylinders inline square arrangements in the high Reynolds number conditions in the thesis. Using the computational fluid dynamics(CFD) and fluent software to conduct the numerical simulation; analyze the experimental data to contrast the result of numerical simulation and the result of wind tunnel test. So we can proof the correctness and feasibility of the