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  Controlling secondary flow in Taylor-Couette turbulence through spanwise-varying roughness

Bakhuis, D., Ezeta, R., Berghout, P., Bullee, P. A., Tai, D., Chung, D., et al. (2020). Controlling secondary flow in Taylor-Couette turbulence through spanwise-varying roughness. Journal of Fluid Mechanics, 883: A15. doi:10.1017/jfm.2019.878.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-9338-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-9339-5
Genre: Journal Article

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 Creators:
Bakhuis, D., Author
Ezeta, R., Author
Berghout, P., Author
Bullee, P. A., Author
Tai, D., Author
Chung, D., Author
Verzicco, R., Author
Lohse, Detlef1, Author              
Huisman, S. G., Author
Sun, C., Author
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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Free keywords: rotating turbulence; turbulent boundary layers; Taylor-Couette flow
 Abstract: Highly turbulent Taylor-Couette flow with spanwise-varying roughness is investigated experimentally and numerically (direct numerical simulations with an immersed boundary method) to determine the effects of the spacing and spanwise width s of the spanwise-varying roughness on the total drag and on the flow structures. We apply sandgrain roughness, in the form of alternating rough and smooth bands to the inner cylinder. Numerically, the Taylor number is O(10(9)) and the roughness width is varied in the range 0.47 <= (s) over tilde = s/d <= 1.23, where d is the gap width. Experimentally, we explore Ta = O(10(12)) and 0.61 <= (s) over tilde <= 3.74. For both approaches the radius ratio is fixed at eta = r(i)/r(o) = 0.716, with r(i) and r(o) the radius of the inner and outer cylinder respectively. We present how the global transport properties and the local flow structures depend on the boundary conditions set by the roughness spacing (s) over tilde. Both numerically and experimentally, we find a maximum in the angular momentum transport as a function of (s) over tilde. This can be attributed to the re-arrangement of the large-scale structures triggered by the presence of the rough stripes, leading to correspondingly large-scale turbulent vortices.

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Language(s): eng - English
 Dates: 2020-01-25
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1017/jfm.2019.878
 Degree: -

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Title: Journal of Fluid Mechanics
Source Genre: Journal
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Pages: 23 Volume / Issue: 883 Sequence Number: A15 Start / End Page: - Identifier: -