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Flow around cylindrical towers : the stabalising role of vertical ribs
Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2006.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867613846037856256 |
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| access_status_str | Open Access |
| author | Alberti, L. I. |
| author2 | Van Zijl, G. P. A. G. |
| author_browse | Alberti, L. I. Van Zijl, G. P. A. G. |
| author_facet | Van Zijl, G. P. A. G. Alberti, L. I. |
| author_sort | Alberti, L. I. |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2006. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/2426 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:42:37.450Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2008 |
| publishDateRange | 2008 |
| publishDateSort | 2008 |
| publisher | Stellenbosch : University of Stellenbosch |
| publisherStr | Stellenbosch : University of Stellenbosch |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/2426 Flow around cylindrical towers : the stabalising role of vertical ribs Alberti, L. I. Van Zijl, G. P. A. G. University of Stellenbosch. Faculty of Engineering. Dept. of Civil Engineering. Theses -- Civil engineering Dissertations -- Civil engineering Cylinders -- Aerodynamics Fluid mechanics Civil engineering Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2006. The aim of this thesis is to study the stabilising effect which vertical ribs may have on a tall cylindrical structure, with the focus on the proposed Solar Chimney. The report begins with a brief introduction to the Solar Chimney concept. A study is made of flow regimes which exist for flow around a circular cylinder and these flow regimes, together with their characteristics, are described. Various threats to the Solar Chimney are identified and will be investigated. The natural shape and strength of the Saguaro Cactus leads to the investigation of vertically ribbed cylinders. Experimental wind tunnel tests are performed in Tokyo, Japan to obtain external pressure distributions. A smooth cylindrical model, as well as two different configurations of vertically ribbed cylinders are tested. These external pressure distributions are numerically integrated in order to obtain calculated drag coefficient values for the cylinders. The drag coefficients for a smooth cylinder and cylinders with vertical ribs are obtained experimentally by means of total drag force measurements. These tests were performed in the wind tunnel at the University of Stellenbosch. The effect of aspect ratio of a smooth cylinder is also addressed. Computational Fluid Dynamics (CFD) analyses are carried out using the CFD software program, FLUENT. Both the drag coefficient and the external pressure distributions were investigated in this way. The differences between theoretical conditions and those of real life conditions of a smooth cylinder are discussed. The report ends by concluding the stabilising effect of vertical ribs on tall cylindrical structures and how these ribs may eliminate some of the present threats to the proposed Solar Chimney. 2008-01-22T08:01:48Z 2010-06-01T08:48:29Z 2008-01-22T08:01:48Z 2010-06-01T08:48:29Z 2006-12 Thesis http://hdl.handle.net/10019.1/2426 en University of Stellenbosch 9639192 bytes application/pdf application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Theses -- Civil engineering Dissertations -- Civil engineering Cylinders -- Aerodynamics Fluid mechanics Civil engineering Alberti, L. I. Flow around cylindrical towers : the stabalising role of vertical ribs |
| title | Flow around cylindrical towers : the stabalising role of vertical ribs |
| title_full | Flow around cylindrical towers : the stabalising role of vertical ribs |
| title_fullStr | Flow around cylindrical towers : the stabalising role of vertical ribs |
| title_full_unstemmed | Flow around cylindrical towers : the stabalising role of vertical ribs |
| title_short | Flow around cylindrical towers : the stabalising role of vertical ribs |
| title_sort | flow around cylindrical towers the stabalising role of vertical ribs |
| topic | Theses -- Civil engineering Dissertations -- Civil engineering Cylinders -- Aerodynamics Fluid mechanics Civil engineering |
| url | http://hdl.handle.net/10019.1/2426 |
| work_keys_str_mv | AT albertili flowaroundcylindricaltowersthestabalisingroleofverticalribs |