Large-eddy simulation of heat transfer from a single cube mounted on a very rough wall
Large-eddy simulation of heat transfer from a single cube mounted on a very rough wall
The local thermal effects in the wake of a single cube, which represents a tall building in an urban area, are studied using large-eddy simulations (LES) for forced, mixed and free convection cases that are characterised by Richardson number, Ri. New wall models are implemented for momentum, temperature and rough surfaces. Comparison of the flow and thermal fields with the wind-tunnel data of Richards et al. (2006) shows fair agreement. Buoyancy effects are quite evident at high Ri and a significant increase in the turbulence levels is observed for such flows. The thermal boundary layer thickness was estimated for different heated surfaces of the cube and its variation with Ri was studied. The heat transfer coefficient for different degrees of thermal forcing was obtained and compared with earlier studies. Quadrant analysis was performed on momentum and heat along the shear layer behind the cube to identify the organised structures.
heat flux, rough wall, single cube, wall model
347–368
Boppana, V.B.L.
817ed7fa-d262-451f-a442-ee8c9b8a2cb0
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61
June 2013
Boppana, V.B.L.
817ed7fa-d262-451f-a442-ee8c9b8a2cb0
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61
Boppana, V.B.L., Xie, Zheng-Tong and Castro, I.P.
(2013)
Large-eddy simulation of heat transfer from a single cube mounted on a very rough wall.
Boundary-Layer Meteorology, 147 (3), .
(doi:10.1007/s10546-012-9793-7).
Abstract
The local thermal effects in the wake of a single cube, which represents a tall building in an urban area, are studied using large-eddy simulations (LES) for forced, mixed and free convection cases that are characterised by Richardson number, Ri. New wall models are implemented for momentum, temperature and rough surfaces. Comparison of the flow and thermal fields with the wind-tunnel data of Richards et al. (2006) shows fair agreement. Buoyancy effects are quite evident at high Ri and a significant increase in the turbulence levels is observed for such flows. The thermal boundary layer thickness was estimated for different heated surfaces of the cube and its variation with Ri was studied. The heat transfer coefficient for different degrees of thermal forcing was obtained and compared with earlier studies. Quadrant analysis was performed on momentum and heat along the shear layer behind the cube to identify the organised structures.
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singlecube_roughwall2013.pdf
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Published date: June 2013
Keywords:
heat flux, rough wall, single cube, wall model
Organisations:
Aerodynamics & Flight Mechanics Group
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Local EPrints ID: 340719
URI: http://eprints.soton.ac.uk/id/eprint/340719
ISSN: 0006-8314
PURE UUID: dfb2e07d-4b75-4985-b295-69026f4c1c41
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Date deposited: 02 Jul 2012 10:08
Last modified: 15 Mar 2024 03:20
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Author:
V.B.L. Boppana
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