Turbulent airflow past a rectangular cylinder building

Downie, TE; Huynh, BP

Turbulent airflow past a rectangular cylinder building

Downie, TE Huynh, BP

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Publication Type:: Conference Proceeding
Citation:: Proceedings of the 19th Australasian Fluid Mechanics Conference, AFMC 2014, 2014
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Downie, TE	en_US
dc.contributor.author	Huynh, BP https://orcid.org/0000-0002-8786-8472	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Proceedings of the 19th Australasian Fluid Mechanics Conference, AFMC 2014, 2014	en_US
dc.identifier.isbn	9780646596952	en_US
dc.identifier.uri	http://hdl.handle.net/10453/33462
dc.description.abstract	The successful use of Computational Fluid Dynamics (CFD) in structural wind engineering applications would significantly reduce the time and resources required compared to scale model testing in a physical wind tunnel. The current industry standard for calculating allowable façade loads on medium and high rise structures involves building and hot tapping a detailed scale model and testing in a physical wind tunnel; this is a time and labour intensive process which could greatly benefit from the successful application of CFD. This paper uses a case study of a rectangular cylinder building to compare the mean pressure coefficient results simulated using CFD k-ω Shear Stress Turbulence (SST) model with wind tunnel measurements. It analyses findings at 0°, 30°, 60° and 90°, in turbulent conditions, at 143 separate points for each angle. Previous research with this model for this application has focused on square cylinders, minimal points of measurement and common angles of incidence. The wind tunnel used was a commercial blockage-tolerant boundary layer wind tunnel and the CFD simulation was run using Ansys CFX 14.0. The wind tunnel results showed mean values falling within a pressure coefficient range of ±1, except for those points located adjacent to the leading edge on the roof. The CFD results showed a good agreement with the mean values obtained in the wind tunnel test for central windward points and locations that were not immediately adjacent to an edge. However a significant over prediction of the pressure coefficient up to 250% was found in areas of separation. The k-ω SST model claims to perform better in areas of adverse pressure gradient and, consequently, areas of separation than the standard k-ω model, k-ε model or their variants. This paper demonstrates that whilst such claims may be correct, the k-ω SST model is still not at an acceptable standard for commercial wind engineering applications.	en_US
dc.relation.ispartof	Proceedings of the 19th Australasian Fluid Mechanics Conference, AFMC 2014	en_US
dc.title	Turbulent airflow past a rectangular cylinder building	en_US
dc.type	Conference Proceeding
utslib.for	0915 Interdisciplinary Engineering	en_US
dc.location.activity	Melbourne, Australia
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US

Abstract:

The successful use of Computational Fluid Dynamics (CFD) in structural wind engineering applications would significantly reduce the time and resources required compared to scale model testing in a physical wind tunnel. The current industry standard for calculating allowable façade loads on medium and high rise structures involves building and hot tapping a detailed scale model and testing in a physical wind tunnel; this is a time and labour intensive process which could greatly benefit from the successful application of CFD. This paper uses a case study of a rectangular cylinder building to compare the mean pressure coefficient results simulated using CFD k-ω Shear Stress Turbulence (SST) model with wind tunnel measurements. It analyses findings at 0°, 30°, 60° and 90°, in turbulent conditions, at 143 separate points for each angle. Previous research with this model for this application has focused on square cylinders, minimal points of measurement and common angles of incidence. The wind tunnel used was a commercial blockage-tolerant boundary layer wind tunnel and the CFD simulation was run using Ansys CFX 14.0. The wind tunnel results showed mean values falling within a pressure coefficient range of ±1, except for those points located adjacent to the leading edge on the roof. The CFD results showed a good agreement with the mean values obtained in the wind tunnel test for central windward points and locations that were not immediately adjacent to an edge. However a significant over prediction of the pressure coefficient up to 250% was found in areas of separation. The k-ω SST model claims to perform better in areas of adverse pressure gradient and, consequently, areas of separation than the standard k-ω model, k-ε model or their variants. This paper demonstrates that whilst such claims may be correct, the k-ω SST model is still not at an acceptable standard for commercial wind engineering applications.

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http://hdl.handle.net/10453/33462