Reynolds number effects in 2D square-bar roughness Wall-bounded turbulent flows
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Date
2022
Authors
Kong, J.
Bennetts, L.G.
Nugroho, B.
Chin, R.
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Conference paper
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Proceedings of the 12th International Symposium on Turbulence and Shear Flow Phenomena, 2022, pp.1-6
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Jiahao Kong, Luke G Bennets, Bagus Nugroho, Rey Chin
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International Symposium on Turbulence and Shear Flow Phenomena (TSFP12) (19 Jul 2022 - 22 Jul 2022 : Osaka, Japan)
Abstract
Turbulent boundary layers (TBLs) above two- dimensional (2D) square-bar roughness are studied ex- perimentally to investigate Reynolds number effects on the turbulent flow properties at moderate friction Reynolds num- bers (Re tau ). Previous studies have examined 2D square-bar roughness at low Re tau numerically and high Re tau experimen- tally. Inspired by their results, a set of experiments were conducted for a classical k-type 2D roughness with the pitch p to height k ratio p/k = 8, at Re tau = 1840, 3900 and 4950. The roughness effect increases with increasing Re tau and extends to the wake region in terms of the streamwise turbulence intensity. The results shows that the drag coefficient Cf converges for the fully-rough, indicating that it behaves like a classical k-type roughness at a fully-developed state when it reaches Re tau >/- 3900 with delta99/k >/- 53
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©2022 The Author(s). TSFP does not require the transfer of copyright and so authors are free to publish their work elsewhere without needing any permission from TSFP