On the Spreading Mechanisms of a Turbulent Spot in Plane Couette Flow
On the Spreading Mechanisms of a Turbulent Spot in Plane Couette Flow
复制标题
平面库埃特流湍流斑的扩散机制
DOI：
10.1209/0295-5075/32/6/004
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
N. Tillmark
中科院分区：
文献类型：
--
作者：
N. Tillmark
本文通过测定平面Couette流中紊流斑与周围无扰动流之间的流场，对斑的展向增长进行了实验分析。对流向和展向速度分量都进行了测量，结果表明，斑点迫使流体向外流动，从而产生了展向速度分量。得到的速度剖面具有曲折的特征，并证实了展向行波的存在。波的速度被确定，并发现是在良好的协议与数值模拟以及流动可视化的结果，在文献中较早报道。
The spanwise growth of a turbulent spot in plane Couette flow is experimentally analysed by determining the flow field in the region between the spot and the undisturbed surrounding flow. Both the streamwise and spanwise velocity components were measured, and show that the spot forces fluid outward, giving rise to a spanwise velocity component. The resulting velocity profile has an inflectional character and the existence of spanwise travelling waves was verified. The wave velocity was determined and found to be in good agreement with numerical simulations as well as flow visualisation results, earlier reported in the literature.