Asymmetric secondary flows above geometrically symmetric surface roughness Article Swipe
Wen Zhang
,
Xiang I. A. Yang
,
Xiaowei Zhu
,
Minping Wan
,
Shiyi Chen
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1017/jfm.2023.590
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1017/jfm.2023.590
The mean flow behaviour of a turbulent boundary layer over rough walls is expected to exhibit symmetries that govern the flow dynamics. In particular, when roughness elements are arranged in a spanwise symmetric manner, the mean flow above them should also exhibit spanwise symmetry. This symmetrical consideration has garnered substantial empirical support. We conduct direct numerical simulations (DNS) of flow over aligned cube arrays to test such symmetry considerations further. We vary the surface coverage density from 0.25 % to 6.25 %, and employ an averaging time of about 100 large-eddy turnover times, which is longer than the typical averaging time in prior DNS studies of rough-wall boundary layers. The results suggest the presence of spanwise asymmetry in the mean flow. Specifically, we observe the development of a prominent secondary vortex on one side of the cubical roughness, accompanied by a relatively smaller secondary vortex on the other side. This asymmetry becomes most pronounced when the surface coverage density is approximately 0.59 %, and diminishes as the coverage density approaches either a low or a high value. We also establish that this mean flow asymmetry is robust across variations in the domain size, the initial condition, and the placement of the cubes in the spanwise direction.
Related Topics
Concepts
Asymmetry
Turbulence
Mechanics
Boundary layer
Physics
Vortex
Secondary flow
Flow (mathematics)
Surface finish
Symmetry (geometry)
Direct numerical simulation
Mean flow
Large eddy simulation
Surface roughness
Geometry
Materials science
Mathematics
Reynolds number
Thermodynamics
Quantum mechanics
Composite material
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1017/jfm.2023.590
- OA Status
- hybrid
- Cited By
- 7
- References
- 75
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4386291737
All OpenAlex metadata
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https://openalex.org/W4386291737Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1017/jfm.2023.590Digital Object Identifier
- Title
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Asymmetric secondary flows above geometrically symmetric surface roughnessWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2023Year of publication
- Publication date
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2023-08-30Full publication date if available
- Authors
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Wen Zhang, Xiang I. A. Yang, Xiaowei Zhu, Minping Wan, Shiyi ChenList of authors in order
- Landing page
-
https://doi.org/10.1017/jfm.2023.590Publisher landing page
- Open access
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YesWhether a free full text is available
- OA status
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hybridOpen access status per OpenAlex
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https://doi.org/10.1017/jfm.2023.590Direct OA link when available
- Concepts
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Asymmetry, Turbulence, Mechanics, Boundary layer, Physics, Vortex, Secondary flow, Flow (mathematics), Surface finish, Symmetry (geometry), Direct numerical simulation, Mean flow, Large eddy simulation, Surface roughness, Geometry, Materials science, Mathematics, Reynolds number, Thermodynamics, Quantum mechanics, Composite materialTop concepts (fields/topics) attached by OpenAlex
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7Total citation count in OpenAlex
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2025: 3, 2024: 4Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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