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Wind and Structures Volume 4, Number 5, October 2001 , pages 441-454 DOI: https://doi.org/10.12989/was.2001.4.5.441 |
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PIV measurement of roof corner vortices |
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Kyung Chun Kim, Ho Seong Ji and Seoung Hak Seong(Korea)
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| Abstract | ||
| Conical vortices on roof corners of a prismatic low-rise building have been investigated by using the PIV(Particle Image Velocimetry) technique. The Reynolds number based on the free stream velocity and model height was 5.3 10 3 . Mean and instantaneous vector fields for velocity, vorticity, and turbulent kinetic energy were measured at two vertical planes and for two different flow angles of 30 o and 45 o . The measurements provided a clear view of the complex flow structures on roof corners such as a pair of counter rotating conical vortices, secondary vortices, and tertiary vortices. They also enabled accurate and easy measurement of the size of vortices. Additionally, we could easily locate the centers of the vortices from the ensemble averaged velocity fields. It was observed that the flow angle of a 30 o produces a higher level of vorticity and turbulent kinetic energy in one of the pair of vortices than does the 45 o flow angle. | ||
| Key Words | ||
| PIV(Particle Image Velocimetry); conical vortices; wind tunnel measurement; instantaneous and ensemble averaged velocity; vorticity and turbulent kinetic energy. | ||
| Address | ||
| Kyung Chun Kim , Ho Seong Ji and Seung Hak Seong, School of Mechanical Engineering, Pusan National University, San 30, Jangjeon-Dong, Kumjung-Ku, Pusan 609-735, Korea | ||