摘要
采用大涡模拟对亚临界区内(Re=3900)三维圆柱绕流现象进行了数值模拟研究,分析了圆柱体表面的受力以及圆柱后流场的时均特性与瞬时特性。结果表明,当Re=3900时圆柱体表面与流速方向相反的压力差引起了不稳定的周期性交替脱落的湍流涡泄,这使得圆柱表面的升力呈现"准周期性"的振动变化,并在圆柱后近流场出现了回流区。研究还发现圆柱周围的流动沿圆柱展向呈现出明显的三维特性。
Numerical simulation of three-dimensional flow past a circular cylinder in subcritical region （Re：3900） by using Large-eddy simulation method is presented in this paper, the stress distribution on the cylindrical surface and the mean and instantaneous characteristics of the flow field behind the cylinder are researched. The results show that it is the negative pressure difference on the cylindrical surface which is of opposite direction to the velocity that causes unstable periodic turbulent vortex shedding, which contributes to the ＂quasi periodic＂ fluctuation of the lift force on the cylindrical surface and the backJlow zone behind the cylinder Moreover, the flow around the cylinder obviously presents three-dimensional characteristics along the cylinder.
出处
《船舶工程》
北大核心
2015年第9期22-26,共5页
Ship Engineering
关键词
圆柱绕流
无限长
三维特性
大涡模拟
flowpast a circular cylinder
infinite-length
three dimensional characteristics
large-eddy simulation
