Formation of tip-vortices on triangular prismatic-shaped cliffs Part 1: A wind tunnel study
Speed-up over topography has long been recognized as significant for structural design and wind energy applications. Here wind flow over cliffs that have a sawtooth plan are studied for speed-up effects under different wind directions. The study undertook PIV measurements to document the mean and tu...
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| Veröffentlicht in: | Journal of wind engineering and industrial aerodynamics 2012-10, Vol.109, p.9-20 |
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| creator | Cochard, S. Letchford, C.W. Earl, T.A. Montlaur, A. |
| description | Speed-up over topography has long been recognized as significant for structural design and wind energy applications. Here wind flow over cliffs that have a sawtooth plan are studied for speed-up effects under different wind directions. The study undertook PIV measurements to document the mean and turbulence changes in three dimensions for simulated atmospheric boundary layer flow in the University of Sydney BLWT. As the flow approaches the cliffs, it accelerates and moves up to pass the obstruction and generates two strong vortices on the top surface of the cliff. Small changes in wind direction not only lead to significantly different speed-up ratios, but also influence the location of the vortices and the level of turbulence. The complexity of the flow field is revealed in this unique three-dimensional study.
► We present wind tunnel results for the flow past triangular cliffs. ► The velocity over the cliff was measured using PIV. ► Two delta wing vortices are created on each side of the triangular cliff. ► Vortices are strong and quite sensitive to small changes in wind direction. |
| doi_str_mv | 10.1016/j.jweia.2012.06.003 |
| format | Article |
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► We present wind tunnel results for the flow past triangular cliffs. ► The velocity over the cliff was measured using PIV. ► Two delta wing vortices are created on each side of the triangular cliff. ► Vortices are strong and quite sensitive to small changes in wind direction.</description><identifier>ISSN: 0167-6105</identifier><identifier>EISSN: 1872-8197</identifier><identifier>DOI: 10.1016/j.jweia.2012.06.003</identifier><identifier>CODEN: JWEAD6</identifier><language>eng</language><publisher>Amsterdam: Elsevier Ltd</publisher><subject>Aerodinàmica ; Aeronàutica i espai ; Applied sciences ; Australia ; Buildings. Public works ; Climatology and bioclimatics for buildings ; Delta-wing vortices ; Dinàmica de fluids ; Energy ; Exact sciences and technology ; Mesurament ; Natural energy ; Particle image velocimetry ; PIV measurements ; Speed ; Steep topography ; Vents ; Wind energy ; Wind speed-up ; Winds ; Àrees temàtiques de la UPC</subject><ispartof>Journal of wind engineering and industrial aerodynamics, 2012-10, Vol.109, p.9-20</ispartof><rights>2012 Elsevier Ltd</rights><rights>2014 INIST-CNRS</rights><rights>Attribution-NonCommercial-NoDerivs 3.0 Spain info:eu-repo/semantics/openAccess <a href="http://creativecommons.org/licenses/by-nc-nd/3.0/es/">http://creativecommons.org/licenses/by-nc-nd/3.0/es/</a></rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c408t-1a3581fa5371882987bde0a4cc0e1fcc91d32e2dee8fe42651e959551497d33c3</citedby><cites>FETCH-LOGICAL-c408t-1a3581fa5371882987bde0a4cc0e1fcc91d32e2dee8fe42651e959551497d33c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0167610512001894$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,776,780,881,3537,26951,27901,27902,65534</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26380566$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Cochard, S.</creatorcontrib><creatorcontrib>Letchford, C.W.</creatorcontrib><creatorcontrib>Earl, T.A.</creatorcontrib><creatorcontrib>Montlaur, A.</creatorcontrib><title>Formation of tip-vortices on triangular prismatic-shaped cliffs Part 1: A wind tunnel study</title><title>Journal of wind engineering and industrial aerodynamics</title><description>Speed-up over topography has long been recognized as significant for structural design and wind energy applications. Here wind flow over cliffs that have a sawtooth plan are studied for speed-up effects under different wind directions. The study undertook PIV measurements to document the mean and turbulence changes in three dimensions for simulated atmospheric boundary layer flow in the University of Sydney BLWT. As the flow approaches the cliffs, it accelerates and moves up to pass the obstruction and generates two strong vortices on the top surface of the cliff. Small changes in wind direction not only lead to significantly different speed-up ratios, but also influence the location of the vortices and the level of turbulence. The complexity of the flow field is revealed in this unique three-dimensional study.
► We present wind tunnel results for the flow past triangular cliffs. ► The velocity over the cliff was measured using PIV. ► Two delta wing vortices are created on each side of the triangular cliff. ► Vortices are strong and quite sensitive to small changes in wind direction.</description><subject>Aerodinàmica</subject><subject>Aeronàutica i espai</subject><subject>Applied sciences</subject><subject>Australia</subject><subject>Buildings. 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Here wind flow over cliffs that have a sawtooth plan are studied for speed-up effects under different wind directions. The study undertook PIV measurements to document the mean and turbulence changes in three dimensions for simulated atmospheric boundary layer flow in the University of Sydney BLWT. As the flow approaches the cliffs, it accelerates and moves up to pass the obstruction and generates two strong vortices on the top surface of the cliff. Small changes in wind direction not only lead to significantly different speed-up ratios, but also influence the location of the vortices and the level of turbulence. The complexity of the flow field is revealed in this unique three-dimensional study.
► We present wind tunnel results for the flow past triangular cliffs. ► The velocity over the cliff was measured using PIV. ► Two delta wing vortices are created on each side of the triangular cliff. ► Vortices are strong and quite sensitive to small changes in wind direction.</abstract><cop>Amsterdam</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.jweia.2012.06.003</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record> |
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| source | Elsevier ScienceDirect Journals Complete; Recercat |
| subjects | Aerodinàmica Aeronàutica i espai Applied sciences Australia Buildings. Public works Climatology and bioclimatics for buildings Delta-wing vortices Dinàmica de fluids Energy Exact sciences and technology Mesurament Natural energy Particle image velocimetry PIV measurements Speed Steep topography Vents Wind energy Wind speed-up Winds Àrees temàtiques de la UPC |
| title | Formation of tip-vortices on triangular prismatic-shaped cliffs Part 1: A wind tunnel study |
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