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PIV measurement of roof corner vortices

  • Kim, Kyung Chun (School of Mechanical Engineering, Pusan National University) ;
  • Ji, Ho Seong (School of Mechanical Engineering, Pusan National University) ;
  • Seong, Seung Hak (School of Mechanical Engineering, Pusan National University)
  • 발행 : 2001.10.25

초록

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 $5.3{\times}10^3$. 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 $30^{\circ}$ and $45^{\circ}$. 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 $30^{\circ}$ produces a higher level of vorticity and turbulent kinetic energy in one of the pair of vortices than does the $45^{\circ}$ flow angle.

키워드

참고문헌

  1. Bienkiewicz, B. and Sun, Y. (1992), "Local wind loading on the roof of a low-rise building", J. Wind Eng. Ind. Aerod., 45, 11-24. https://doi.org/10.1016/0167-6105(92)90003-S
  2. Banks, D., Meroney, R.N., Sarkar, P.P., Zhao, Z. and Wu, F. (2000), "Flow visualization of conical vortices on flat roofs with simultaneous surface pressure measurement", J. Wind. Eng. Ind. Aerod., 84, 65-85. https://doi.org/10.1016/S0167-6105(99)00044-6
  3. Bradshaw, P. and Wong, F.Y.F. (1972), "The reattachment and relaxation of a turbulent shear layer", J. Fluid Mech., 52, 113. https://doi.org/10.1017/S002211207200299X
  4. Hwangbo, D., Ji, H.S., Seong, S.H. and Kim, K.C. (2000), "Wind tunnel modeling of prizmatic low-rise building in the atmospheric boundary layer", 1st Int. Symp. on Wind and Structure, 327-336.
  5. Ham, H.J. Bienkiewicz, B. (1998), "Wind tunnel simulation of TTU flow and building roof pressure", J. Wind. Eng. Ind. Aerod., 77&78, 119-133.
  6. Kawai, H. and Nishimura, G. (1996), "Characteristics of fluctuating suction and conical vortices in a flat roof in oblique flow", J. Wind Eng. Ind. Aerod., 60, 211-225. https://doi.org/10.1016/0167-6105(96)00035-9
  7. Kawai, H. (2000), "Local peak pressure on a flat roof - mechanism and reduction-", 1st Int. Symp. on Wind and Structures, 91-98.
  8. Kim, K.C. (2000), Personal Communications.
  9. Kim, K.C., Kim, S.K. and Yoon, S.Y. (2000), "PIV measurements of the flow and turbulent characteristics of a round jet in crossflow", J. of Visualization, 3(2).
  10. Marwood, R. and Wood, C.J. (1997), "Conical vortex movement and its effect on roof pressures", J. Wind. Eng. Ind. Aerod., 69&71, 589-595.
  11. Stathopoulos, T., Marathe, R. and Wu, H. (1999), "Mean wind pressures on flat roof corner affected by parapets: field and wind tunnel studies", Eng. Struct., 21, 629-638. https://doi.org/10.1016/S0141-0296(98)00011-X
  12. Tieleman, H.W., Surry, D. and Mehta, K.C. (1996), "Full/model scale comparison of surface pressure on Texas Tech experimental building", J. Wind. Eng. Ind. Aerod., 61, 1-23. https://doi.org/10.1016/0167-6105(96)00042-6

피인용 문헌

  1. Improvement and validation of a flow model for conical vortices vol.19, pp.2, 2014, https://doi.org/10.12989/was.2014.19.2.113
  2. 3-D characteristics of conical vortex around large-span flat roof by PIV technique vol.22, pp.6, 2016, https://doi.org/10.12989/was.2016.22.6.663
  3. Development and Verification of a Flow Model of Conical Vortices on Saddle Roofs vol.141, pp.3, 2015, https://doi.org/10.1061/(ASCE)EM.1943-7889.0000848
  4. Wind pressure features of large-span flat roof in different wind fields induced by conical vortex vol.38, pp.8, 2015, https://doi.org/10.1080/02533839.2015.1052350