Journal of Wind Engineering
Online ISSN : 1349-340X
Print ISSN : 1349-3507
ISSN-L : 1349-340X
Technical Paper
Switching phenomenon of conical vortices on the flat roof of a low-rise building
Hiroaki NISHIMURAHiromasa KAWAI
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JOURNAL FREE ACCESS

2010 Volume 35 Issue 4 Pages 99-106

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Abstract
A pair of conical vortices formed on a flat roof of a low-rise building, when an approaching flow attacks to the building with an oblique angle, randomly exchanges their strength to each other. The phenomenon is called as the 'Switching of conical vortices'.
When a splitter plate was set on the roof to prevent the direct interference between conical vortices on the roof, the switching phenomenon still appeared clearly, while a splitter plate set in the wake of the model eliminated the occurrence of the switching of conical vortices on the roof. These findings considerably justify the idea that the switching of conical vortices on a roof, which were connected to vortices in the wake of the model, can be drawn from the interference between vortices in the wake.
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© 2010 by Japan Association for Wind Engineering
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