Turbulent plane Couette flow at moderately high Reynolds number
Turbulent plane Couette flow at moderately high Reynolds number
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DOI：
10.1017/jfm.2014.323
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发表时间：
2014-07-01
影响因子：
3.7
通讯作者：
Garcia-Galache, J. P.
中科院分区：
文献类型：
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作者：
Avsarkisov, V.;Hoyas, S.;Garcia-Galache, J. P.
在雷诺数下（20;2h; 6）大盒子内紊流平面Couette流动的一组新的数值模拟。（Re-tau） = 125、180、250和550进行了描述，并与低雷诺数下的模拟、泊泽维尔流和实验进行了比较。模拟显示了一个对数近壁层，并用于验证和修正先前已知的结果。结果表明，在壁面单元中，顺流方向和展向方向的波动强度不能很好地标度。结垢破坏既发生在靠近壁处，也发生在远离壁处。相反，墙-法向强度尺度在近壁区为内单元，在核心区为外单元。Hoyas和Jimenez（物理学家）发现的光谱脊。流体，vol. 18, 2003, 011702)紊流泊泽维尔流也可以在目前的流动中看到。在远离墙的地方，可以发现非常大规模的运动跨越整个通道的长度。这些模拟的统计数据可以从流体动力学主席的网页上下载。
A new set of numerical simulations of turbulent plane Couette flow in a large box of dimension (20 pi h; 2h; 6 pi h /at Reynolds number. (Re-tau) = 125, 180, 250 and 550 is described and compared with simulations at lower Reynolds numbers, Poiseuille flows and experiments. The simulations present a logarithmic near-wall layer and are used to verify and revise previously known results. It is confirmed that the fluctuation intensities in the streamwise and spanwise directions do not scale well in wall units. The scaling failure occurs both near to and away from the wall. On the contrary, the wall-normal intensity scales in inner units in the near-wall region and in outer units in the core region. The spectral ridge found by Hoyas & Jimenez (Phys. Fluids, vol. 18, 2003, 011702) for the turbulent Poiseuille flow can also be seen in the present flow. Away from the wall, very large-scale motions are found spanning through all the length of the channel. The statistics of these simulations can be downloaded from the webpage of the Chair of Fluid Dynamics.