摘要
本文采用DES模拟方法,模拟了ReH=40000时处于完全发展边界层中的方体绕流。分析了中垂面上物理量和流场,讨论了DES与RANS模拟结果的差异。DES模拟结果捕捉到了方体前复杂的马蹄涡系统结构及其演化过程。马蹄涡系统由发展涡、主涡、壁角涡以及它们之间一系列反向旋转的诱导涡构成。周期变化过程中,主涡不断由发展涡脱落分离出来并与壁角涡融合;新发展涡不是在马蹄涡系统上游独自形成的,而是原发展涡分离出主涡后留下的残余部分;主涡由发展涡分离出来的断裂过程由两侧开始,向中间发展汇合,最终从发展涡分离出去。
The flow around a cube within full developed boundary layer was simulated using DES at Reynolds number of 40000.The quantities and flow fields on the symmetry streamwise plane were analyzed,and the differences between DES and RANS results were discussed.A complex horseshoe vortex system and its development was also observed at Reynolds number of 40000.The system consists of developing vortex,primary vortex,and corner vortex which are clockwise-rotating,and other induced counter-rotating vortices.The primary vortex breaks away from the developing vortex and then merges with the corner vortexin a breaking away cycle.A new developing vortex does not develop upstream of the old developing vortex itself.Instead,it is the rest part of the old developing vortex after primary vortex breaking away,with breaking process developing from two sides to the center.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第3期535-540,共6页
Journal of Engineering Thermophysics
基金
中国国际科技合作计划项目(No.2010DFA64600)
关键词
DES
数值模拟
钝体
马蹄涡
DES
numerical simulation
flow field
horse vortex bluff bodies
horseshoe vortex
