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Drag reduction by herringbone riblet texture in direct numerical simulations of turbulent channel flow

机译：人字形肋状结构在湍流通道流动直接数值模拟中的减阻作用

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A bird-feather-inspired herringbone riblet texture was investigated for turbulent drag reduction. The texture consists of blade riblets in a converging/diverging or herringbone pattern with spanwise wavelength Λf. The aim is to quantify the drag change for this texture as compared to a smooth wall and to study the underlying mechanisms. To that purpose, direct numerical simulations of turbulent flow in a channel with height Lz were performed. The Fukagata-Iwamoto-Kasagi identity for drag decomposition was extended to textured walls and was used to study the drag change mechanisms. For Λf/Lz ≳ O(10), the herringbone texture behaves similarly to a conventional parallel-riblet texture in yaw: the suppression of turbulent advective transport results in a slight drag reduction of 2%. For Λf/Lz ≲ O(1), the drag increases strongly with a maximum of 73%. This is attributed to enhanced mean and turbulent advection, which results from the strong secondary flow that forms over regions of riblet convergence/divergence. Hence, the employment of convergent/divergent riblets in the texture seems to be detrimental to turbulent drag reduction.
机译：研究了鸟羽启发的人字形肋骨纹理，以减少湍流阻力。纹理由具有会聚/发散或人字形图案的叶片肋骨组成，其翼展方向波长为。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Lz的通道中的湍流进行了直接数值模拟。将Fukagata-Iwamoto-Kasagi用于阻力分解的标识扩展到纹理墙，并用于研究阻力变化机制。对于Λf/ Lz≳O（10），在偏航中，人字形纹理的行为与常规的平行肋状纹理相似：抑制湍流对流输运会导致阻力减小2％。对于Λf/ Lz≲O（1），阻力最大增加73％。这归因于均流和湍流对流的增强，这是由于在肋骨会聚/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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