圆柱绕流底部流场及紊动特性试验研究

发布时间：2018-05-27 17:14

本文选题：圆柱绕流 + 流场　；参考：《天津大学》2014年硕士论文

【摘要】：本文采用数值模拟和物理模型相结合的办法,对圆柱绕流底部流场及紊动特性进行研究。首先对单圆柱绕流的模型试验和数值模拟及流体的紊动特性相关研究工作进行回顾;而后在光滑底床条件下,使用超声多普勒流速仪对均匀流作用下圆柱周围多个断面进行三维瞬时流速测量;采取统计学原理的计算方法,结合紊动力学相关知识分析不同位置时均流速、脉动流速、紊动强度及雷诺应力等紊动特性沿水流方向和断面的分布规律。最后,应用Flow-3D软件建立了三维圆柱绕流模型,使用RNG k-?紊流模型,对均匀流下单桩圆柱绕流现象进行模拟;将计算结果与物理模型进行对比验证,结合两种方法的结果研究均匀流作用下单桩周围水流特性和紊动特性。分析建筑物前的马蹄涡形态、桩后尾迹区的尾涡等流动过程。
[Abstract]:In this paper, the numerical simulation and physical model are used to study the flow field and turbulent characteristics at the bottom of the flow around a cylinder. First, the model test and numerical simulation of the flow around a single cylinder and the research work on the turbulent characteristics of the fluid are reviewed, and then under the condition of smooth bottom bed, Using ultrasonic Doppler velocimeter to measure three dimensional instantaneous velocity of multiple sections around the cylinder under uniform flow, adopting the calculation method of statistical principle, combining with relevant knowledge of methodictic dynamics to analyze the mean velocity and pulsating velocity at different positions, The distribution of turbulence characteristics along the direction and section of flow, such as turbulence intensity and Reynolds stress. Finally, a three-dimensional cylindrical flow model is established by using Flow-3D software, using RNG k-? The turbulent model is used to simulate the flow around the cylinder of the uniform flow order pile, and the results are compared with the physical model to study the characteristics of the flow and turbulence around the ordered pile under the uniform flow combined with the results of the two methods. The flow process of the horseshoe vortex in front of the building and the wake in the wake behind the pile is analyzed.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV131.3

【相似文献】