Analysis of the coherent and turbulent stresses of a numerically simulated rough wall pipe
Boundary layer flow; Boundary layers; Fluid mechanics; Quay walls; Reynolds number; Secondary flow; Wall flow; Boundary layer thickness; Dispersive components; Rough wall flows; Roughness elements; Topological features; Triple decomposition; Turbulent stress; Wall pipe; Atmospheric thermodynamics
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2023
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my.uniten.dspace-232542023-05-29T14:38:49Z Analysis of the coherent and turbulent stresses of a numerically simulated rough wall pipe Chan L. MacDonald M. Chung D. Hutchins N. Ooi A. 57139456500 56611327100 34976574800 15925318900 7005905452 Boundary layer flow; Boundary layers; Fluid mechanics; Quay walls; Reynolds number; Secondary flow; Wall flow; Boundary layer thickness; Dispersive components; Rough wall flows; Roughness elements; Topological features; Triple decomposition; Turbulent stress; Wall pipe; Atmospheric thermodynamics A turbulent rough wall flow in a pipe is simulated using direct numerical simulation (DNS) where the roughness elements consist of explicitly gridded three-dimensional sinusoids. Two groups of simulations were conducted where the roughness semi-amplitude h+ and the roughness wavelength ?+ are systematically varied. The triple decomposition is applied to the velocity to separate the coherent and turbulent components. The coherent or dispersive component arises due to the roughness and depends on the topological features of the surface. The turbulent stress on the other hand, scales with the friction Reynolds number. For the case with the largest roughness wavelength, large secondary flows are observed which are similar to that of duct flows. The occurrence of these large secondary flows is due to the spanwise heterogeneity of the roughness which has a spacing approximately equal to the boundary layer thickness ?. � Published under licence by IOP Publishing Ltd. Final 2023-05-29T06:38:49Z 2023-05-29T06:38:49Z 2017 Conference Paper 10.1088/1742-6596/822/1/012011 2-s2.0-85018387369 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018387369&doi=10.1088%2f1742-6596%2f822%2f1%2f012011&partnerID=40&md5=450cb747202ba3a745f75cfec6204974 https://irepository.uniten.edu.my/handle/123456789/23254 822 1 12011 All Open Access, Bronze Institute of Physics Publishing Scopus |
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| description |
Boundary layer flow; Boundary layers; Fluid mechanics; Quay walls; Reynolds number; Secondary flow; Wall flow; Boundary layer thickness; Dispersive components; Rough wall flows; Roughness elements; Topological features; Triple decomposition; Turbulent stress; Wall pipe; Atmospheric thermodynamics |
| author2 |
57139456500 |
| author_facet |
57139456500 Chan L. MacDonald M. Chung D. Hutchins N. Ooi A. |
| format |
Conference Paper |
| author |
Chan L. MacDonald M. Chung D. Hutchins N. Ooi A. |
| spellingShingle |
Chan L. MacDonald M. Chung D. Hutchins N. Ooi A. Analysis of the coherent and turbulent stresses of a numerically simulated rough wall pipe |
| author_sort |
Chan L. |
| title |
Analysis of the coherent and turbulent stresses of a numerically simulated rough wall pipe |
| title_short |
Analysis of the coherent and turbulent stresses of a numerically simulated rough wall pipe |
| title_full |
Analysis of the coherent and turbulent stresses of a numerically simulated rough wall pipe |
| title_fullStr |
Analysis of the coherent and turbulent stresses of a numerically simulated rough wall pipe |
| title_full_unstemmed |
Analysis of the coherent and turbulent stresses of a numerically simulated rough wall pipe |
| title_sort |
analysis of the coherent and turbulent stresses of a numerically simulated rough wall pipe |
| publisher |
Institute of Physics Publishing |
| publishDate |
2023 |
| _version_ |
1806424521386754048 |