采用时间分辨层析PIV以欧拉和拉格朗日视角研究湍流边界层（TBL）

2017/02/13   下载量： 4 次

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The momentum exchange mechanisms in a turbulent boundary layer (TBL) flow are of manifold
temporal and spatial scales and governed by the organization of self-sustaining coherent flow structures
driven by entrained high momentum fluid. Generic flow structures such as hairpin-like vortices and spanwise
alternating wall bounded low- and high-speed streaks have been observed and extensively analyzed with
both experimental and numerical methods, e.g. by means of PIV (Christensen & Adrian 2001, Kähler 2004,
Stanislas et al. 2008) or DNS (Spalart 1988, Robinson 1991, Kang et al. 2007). In many studies the role of
these structures for the wall normal and spanwise fluid exchange has been highlighted mostly within an
Eulerian reference frame. But for a full understanding of the momentum exchange in turbulent wall flows a
step towards a spatially resolved Lagrangian frame of reference would be advantageous.
The data achieved from the present application of time-resolved tomographic PIV to a flat plate turbulent
boundary layer flow in a water tunnel at Reθ ~ 2460 enables for the first time a topological investigation of
the flow structures and related particle motions within a temporally and spatially highly resolved Lagrangian
and Eulerian reference frame.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 采用拉格朗日相干结构方法建立左心室流动和血栓栓塞风险的关联模型

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北京欧兰科技发展有限公司
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