Turbulent Boundary Layers Over Multiscale Rough Patches

Turbulent Boundary Layers Over Multiscale Rough Patches
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多尺度粗糙斑块上的湍流边界层

DOI:
10.1007/s10546-019-00430-x
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发表时间:
2019
影响因子:
4.3
通讯作者:
Vanderwel C
Vanderwel C
中科院分区:
地球科学3区
文献类型:
--
作者:
Vanderwel C

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本文在风洞中研究了多尺度粗糙斑对完全粗糙湍流边界层阻力和流动结构的影响。几个补丁包含有组织的和随机安排的立方体的多种尺寸进行了测试,以研究阻力的依赖性的正面的补丁的坚固性。在雷诺数范围内用阻力天平测量每个斑块的阻力,表明阻力对锋面实度的依赖性遵循Macdonald等人预测的趋势(Atmos Environ 32(11):1857-1864,1998)。其中一个补丁也被复制与最小的规模删除和测量表明,较小的规模对整体阻力的影响可以忽略不计。在几个横截面的流场被捕获使用粒子图像测速仪,和速度赤字和增加的湍流活动的补丁后的地图被确定,并用于定义由每个补丁形成的内部边界层的程度。
We experimentally investigate the effects of multiscale rough patches on the drag and flow structure of a fully rough turbulent boundary layer in a wind tunnel. Several patches containing both organized and randomized arrangements of cubes of multiple sizes are tested in order to study the dependence of drag on the frontal solidity of the patch. The drag of each patch is measured with a drag balance for a range of Reynolds numbers, indicating a dependence of the drag on the frontal solidity following the trend predicted by Macdonald et al. (Atmos Environ 32(11):1857–1864, 1998). One of the patches is also replicated with the smallest scales removed and measurements show that the smaller scales have negligible impact on the overall drag. Flow fields in several cross-sections are captured using particle image velocimetry, and maps of the velocity deficit and increased turbulence activity in the wake of the patches are determined and used to define the extent of the internal boundary layer formed by each patch.
DOI: 10.1007/s10546-016-0200-7
发表时间: 2017-02-01
影响因子: 4.3
作者:
Castro, Ian P.;Xie, Zheng-Tong;Coceal, O.
通讯作者: Coceal, O.
壁粗糙度发生阶跃变化后湍流边界层的发展
DOI: 10.1017/jfm.2016.213
发表时间: 2016
影响因子: 3.7
作者:
Hanson R
通讯作者: Hanson R
DOI: --
发表时间: 2016
期刊:
影响因子: --
作者:
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通讯作者: M. Schultz