- Title
- Drag of a turbulent boundary layer with transverse 2D circular rods on the wall
- Creator
- Kamruzzaman, Md; Djenidi, L.; Antonia, R. A.; Talluru, K. M.
- Relation
- ARC
- Relation
- Experiments in Fluids Vol. 56, Issue 6
- Publisher Link
- http://dx.doi.org/10.1007/s00348-015-1995-6
- Publisher
- Springer
- Resource Type
- journal article
- Date
- 2015
- Description
- In this paper, we present the results of a turbulent boundary layer developing over a rod-roughened wall with a spacing of λ/k=8 (λ is the spacing between two adjacent roughness elements, and k is the rod diameter). Static pressure measurements are taken around a single roughness element to accurately determine the friction velocity, Uτ and the error in the origin, d₀, which are the two prominent issues that surround rough-wall boundary layers. In addition, velocity measurements are taken at several streamwise locations using hot-wire anemometry to obtain Cf from the momentum integral equation. Results showed that both methods give consistent values for Uτ, indicating that the contribution of the viscous drag over this rough wall is negligible. This supports the results of Perry et al. (J Fluid Mech 177:437–466, 1969) and Antonia and Luxton (J Fluid Mech 48(04):721–761, 1971) in a boundary layer and of Leonardi et al. (2003) in a channel flow but does not agree with those of Furuya et al. (J Fluids Eng 98(4):635–643, 1976). The results show that both Uτ and d₀ can be unambiguously measured on this particular rough wall. This paves the way for a proper comparison between the boundary layer developing over this wall and the smooth-wall turbulent boundary layer.
- Subject
- rod-roughened wall; turbulent boundary layer; 2D circular rods
- Identifier
- http://hdl.handle.net/1959.13/1339200
- Identifier
- uon:28197
- Identifier
- ISSN:0723-4864
- Language
- eng
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