Drag Reduction by Sand Grain Roughness

Abe, Kazuki; Matsumoto, Akira; Munakata, Hirosuke; Tani, Itirô

doi:10.1007/978-3-642-50971-1_28

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Re-evaluation O F Nikuradse's Experimental Data For Rough Pipes1

Introduction1

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1993

2017

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Cited by 5 publications

(2 citation statements)

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“…As demonstrated by an ad hoc experiment (Abe et al, 1989), reduction of F remains almost the same as for rough pipe, but dH becomes positive since 17 is found to be larger than that for smooth plate. Thus, the marked difference between the two cases, drag-reducing rough plate flow and no drag-reducing rough pipe flow, is only perceivable in the difference of the behavior of 17.…”

Section: Re-evaluation O F Nikuradse's Experimental Data For Rough Pipesmentioning

confidence: 76%

Re-evaluation of Nikuradse's experimental data for rough pipes.

Tani¹

1989

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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Section: Re-evaluation O F Nikuradse's Experimental Data For Rough Pipesmentioning

confidence: 76%

Re-evaluation of Nikuradse's experimental data for rough pipes.

Tani¹

1989

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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“…Of the investigated flat plate textures -such as sifted sand grains [2], transverse square grooves [86], dimples [1] and V-shaped protrusions [67] -the well-studied riblet texture seems most promising for turbulent DR. This texture has been found on the scales of some fast-shark skins [20] and consists of ridges or riblets aligned with the mean flow direction.…”

Section: Introductionmentioning

confidence: 99%

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

Benschop

Breugem

2017

Journal of Turbulence

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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 f . 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 L z were performed. The FukagataIwamoto-Kasagi identity for drag decomposition was extended to textured walls and was used to study the drag change mechanisms. For f /L z ࣡ 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, 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.

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Possibility of drag reduction using d-type roughness

Choi

Fujisawa

1993

Further Developments in Turbulence Management

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Drag Reduction by Sand Grain Roughness

Cited by 5 publications

References 3 publications

Re-evaluation of Nikuradse's experimental data for rough pipes.

Re-evaluation of Nikuradse's experimental data for rough pipes.

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

Possibility of drag reduction using d-type roughness

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