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Drag Reduction by Herringbone Riblet Texture in Direct Numerical Simulations of Turbulent Channel Flow

机译:直接数值挖掘中人字纹Riblet纹理减阻   湍流通道流动的模拟

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摘要

A bird-feather-inspired herringbone riblet texture was investigated forturbulent drag reduction. The texture consists of blade riblets in aconverging/diverging or herringbone pattern with spanwise wavelength$\Lambda_f$. The aim is to quantify the drag change for this texture ascompared to a smooth wall and to study the underlying mechanisms. To thatpurpose, Direct Numerical Simulations of turbulent flow in a channel withheight $L_z$ were performed. The FIK-identity for drag decomposition wasextended to textured walls and was used to study the drag change mechanisms.For $\Lambda_f/L_z \gtrsim O(10)$, the herringbone texture behaves similarly toa conventional parallel-riblet texture in yaw: the suppression of turbulentadvective transport results in a slight drag reduction of 2%. For$\Lambda_f/L_z \lesssim O(1)$, the drag increases strongly with a maximum of73%. This is attributed to enhanced mean and turbulent advection, which resultsfrom the strong secondary flow that forms over regions of ribletconvergence/divergence. Hence, the employment of convergent/divergent ribletsin the texture seems to be detrimental to turbulent drag reduction.
机译:研究了鸟羽启发的人字形肋状结构减少了湍流阻力。纹理由呈会聚/发散或人字形的叶片肋组成,其翼展方向波长为\\ Lambda_f $。目的是量化与光滑墙相比该纹理的阻力变化,并研究其潜在机理。为此,对高度为$ L_z $的通道中的湍流进行了直接数值模拟。用于阻力分解的FIK身份扩展到带纹理的墙壁,并用于研究阻力变化机制。对于$ \ Lambda_f / L_z \ gtrsim O(10)$,人字形纹理的行为类似于偏航中的常规平行肋纹理:抑制湍流对流输运会导致阻力降低2%。对于$ \ Lambda_f / L_z \ lesssim O(1)$,阻力最大增加为73%。这归因于均流和湍流对流的增强,这是由于在肋骨收敛/发散区域上形成的强次流所致。因此,在纹理中使用收敛/发散的肋骨似乎不利于湍流阻力的减小。

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