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Transverse turbulent bands in rough plane Couette flow
Tokyo Univ Sci, Dept Mech Engn, 2641 Yamazaki, Noda, Chiba 2788510, Japan..
Tokyo Univ Sci, Dept Mech Engn, 2641 Yamazaki, Noda, Chiba 2788510, Japan..
Japan Aerosp Explorat Agcy JAXA, Aeronaut Technol Directorate, 6-13-11 Osawa, Mitaka, Tokyo 1810015, Japan..
Univ Paris Saclay, LIMSI CNRS, Campus Univ Orsay, F-91405 Orsay, France..
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2018 (English)In: Journal of Fluid Science and Technology, ISSN 1880-5558, Vol. 13, no 3, article id 18-00159Article in journal (Refereed) Published
Abstract [en]

In most subcritical planar shear flows, the transitional regime features oblique large-scale laminar-turbulent patterns. So far, such laminar-turbulent patterns have only been investigated in flows over perfectly smooth walls and little attention has been devoted to cases with rough surfaces as found in most practical engineering, urban applications, and in nature. In this study, we investigate laminar-turbulent patterns in plane Couette flow with one rough wall by means of direct numerical simulation, as a function of the Reynolds number and of the roughness height. The roughness is modeled using a force term in the Navier-Stokes equations. The focus of this study is on a new regime featuring non-oblique turbulent bands transverse to the motion of the walls, and separated by arbitrary long laminar gaps. This regime is found when the wall is sufficiently rough. This transverse turbulent band occurs at Reynolds numbers just below the onset of self-sustained turbulence found in the smooth wall case. The localized turbulence patches have a streamwise extent as large as 50-180 gap widths, decreasing with decreasing Reynolds number. The turbulent fraction as well as the band width show a linear relationship with the Reynolds number.

Place, publisher, year, edition, pages
The Japan Society of Mechanical Engineers , 2018. Vol. 13, no 3, article id 18-00159
Keywords [en]
DNS, Canopy flow, Intermittency, Laminar-turbulence coexistence, Plane Couette flow, Roughness, Subcritical transition, Turbulent stripe, Wall-bounded turbulence
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-239514DOI: 10.1299/jfst.2018jfst0019ISI: 000449657400008Scopus ID: 2-s2.0-85057163795OAI: oai:DiVA.org:kth-239514DiVA, id: diva2:1266554
Funder
Swedish Research Council, 621-2016-03533 621-2016-03533
Note

QC 20181128

Available from: 2018-11-28 Created: 2018-11-28 Last updated: 2019-03-18Bibliographically approved

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