Spectral Analysis of the Slip-Length Model for Turbulence over Textured Superhydrophobic Surfaces.
Spectral Analysis of the Slip-Length Model for Turbulence over Textured Superhydrophobic Surfaces.
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DOI：
10.1007/s10494-018-9919-1
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
García-Mayoral R
中科院分区：
文献类型：
--
作者：
Fairhall CT;García-Mayoral R
我们评估的适用性滑移长度模型来表示纹理超疏水表面。从直接数值模拟的结果，并通过考虑从光谱角度的滑移长度，我们区分不同的长度尺度在上覆湍流所经历的表观边界条件。特别是，我们专注于所经历的近壁湍流动力学lengthscales的滑移长度。我们的研究结果表明，均匀滑移长度模型的明显失败是不是纹理尺寸变得可比的流动中的涡流的大小的直接影响。纹理引起的信号散射到整个波数空间，影响所有长度尺度上的感知滑移长度，即使是那些比纹理大得多的尺度。我们建议，失败是由纹理诱导流的强度，而不是它的波长，成为可比的背景湍流。
We assess the applicability of slip-length models to represent textured superhydrophobic surfaces. From the results of direct numerical simulations, and by considering the slip length from a spectral perspective, we discriminate between the apparent boundary conditions experienced by different lengthscales in the overlying turbulent flow. In particular, we focus on the slip lengths experienced by lengthscales relevant to the near wall turbulent dynamics. Our results indicate that the apparent failure of homogeneous slip-length models is not the direct effect of the texture size becoming comparable to the size of eddies in the flow. The texture-induced signal scatters to the entire wavenumber space, affecting the perceived slip length across all lengthscales, even those much larger than the texture. We propose that the failure is caused by the intensity of the texture-induced flow, rather than its wavelength, becoming comparable to the background turbulence.
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影响因子：
3.7
作者：
Martell, Michael B.;Perot, J. Blair;Rothstein, Jonathan P.
通讯作者：
Rothstein, Jonathan P.
影响因子：
3.7
作者：
BECHERT, DW;BARTENWERFER, M
通讯作者：
BARTENWERFER, M
影响因子：
4.6
作者：
Fukagata, K;Kasagi, N;Koumoutsakos, P
通讯作者：
Koumoutsakos, P
影响因子：
4.6
作者：
JIMENEZ, J
通讯作者：
JIMENEZ, J
影响因子：
2
作者：
PHILIP, JR
通讯作者：
PHILIP, JR