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Scalar Transport in flow past finite circular patches of tall roughness

Scalar Transport in flow past finite circular patches of tall roughness
Scalar Transport in flow past finite circular patches of tall roughness
Simultaneous particle image velocimetry-planar laserinduced fluorescence (PIV-PLIF) measurements are conducted of the flow around and downstream of patches of tall cylinders with various solidity φ ≡ Nc(d/D)2, where Nc is the number of cylinders in a patch, d and D are the diameters of the cylinder and the patch, respectively. Results suggest that the bleeding and scalar concentration in the wake and above the patches are dependent upon φ. Recirculation bubble appears at the trailing edge (TE) of the patch, limiting the flow from convecting downstream and forcing the flow (and the scalar) to escape vertically from the top of the patch. Above the wake, a shear layer generated by the velocity difference shields the near-wake region. The net effect is the appearance of an elongated patch as φ decreases and a taller patch as φ increases. In terms of scalar transport, both advective and turbulent vertical scalar transport are enhanced as φ increases. High advective vertical scalar transport CV is concentrated around the canopy (above the canopy due to vertical bleeding and at the TE due to high scalar concentration), while high turbulent transport c′v′largely coincides with the shear layer. Joint probability density function (PDF) calculated at few selected points show that there is an entrainment of turbulent flows from the shear layer towards the wake of the patch below this layer, followed by scalar diffusion the the same direction and further downstream
of the patch.
1-6
Wangsawijaya, Dea Daniella
b9f307f6-2828-416f-bc41-a025ecf49098
Nicolai, Claudia
8bdc34da-efe2-4dd0-b3bc-ece3bbddebff
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Wangsawijaya, Dea Daniella
b9f307f6-2828-416f-bc41-a025ecf49098
Nicolai, Claudia
8bdc34da-efe2-4dd0-b3bc-ece3bbddebff
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052

Wangsawijaya, Dea Daniella, Nicolai, Claudia and Ganapathisubramani, Bharathram (2022) Scalar Transport in flow past finite circular patches of tall roughness. 12th International Symposium on Turbulence and Sher Flow Phenomena, , Osaka, Japan. 19 - 22 Jul 2022. pp. 1-6 .

Record type: Conference or Workshop Item (Paper)

Abstract

Simultaneous particle image velocimetry-planar laserinduced fluorescence (PIV-PLIF) measurements are conducted of the flow around and downstream of patches of tall cylinders with various solidity φ ≡ Nc(d/D)2, where Nc is the number of cylinders in a patch, d and D are the diameters of the cylinder and the patch, respectively. Results suggest that the bleeding and scalar concentration in the wake and above the patches are dependent upon φ. Recirculation bubble appears at the trailing edge (TE) of the patch, limiting the flow from convecting downstream and forcing the flow (and the scalar) to escape vertically from the top of the patch. Above the wake, a shear layer generated by the velocity difference shields the near-wake region. The net effect is the appearance of an elongated patch as φ decreases and a taller patch as φ increases. In terms of scalar transport, both advective and turbulent vertical scalar transport are enhanced as φ increases. High advective vertical scalar transport CV is concentrated around the canopy (above the canopy due to vertical bleeding and at the TE due to high scalar concentration), while high turbulent transport c′v′largely coincides with the shear layer. Joint probability density function (PDF) calculated at few selected points show that there is an entrainment of turbulent flows from the shear layer towards the wake of the patch below this layer, followed by scalar diffusion the the same direction and further downstream
of the patch.

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More information

e-pub ahead of print date: 19 July 2022
Venue - Dates: 12th International Symposium on Turbulence and Sher Flow Phenomena, , Osaka, Japan, 2022-07-19 - 2022-07-22

Identifiers

Local EPrints ID: 470763
URI: http://eprints.soton.ac.uk/id/eprint/470763
PURE UUID: 508778c3-1fd4-406d-b22b-a987467c69fe
ORCID for Dea Daniella Wangsawijaya: ORCID iD orcid.org/0000-0002-7072-4245
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

Catalogue record

Date deposited: 19 Oct 2022 17:01
Last modified: 17 Mar 2024 04:05

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Contributors

Author: Dea Daniella Wangsawijaya ORCID iD
Author: Claudia Nicolai

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