Wind and Structures

  • 제4권4호
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  • Pages.279-298
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  • 2001
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A model of roof-top surface pressures produced by conical vortices : Evaluation and implications

  • Banks, D. (Fluid Mechanics and Wind Engineering Program, Civil Engineering Department, Colorado State University) ;
  • Meroney, R.N. (Fluid Mechanics and Wind Engineering Program, Civil Engineering Department, Colorado State University)
  • 발행 : 2001.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

The greatest suction on the cladding of flat roof low-rise buildings is known to occur beneath the conical vortices that form along the roof edges for cornering winds. In a companion paper, a model of the vortex flow mechanism has been developed which can be used to connect the surface pressure beneath the vortex to adjacent flow conditions. The flow model is experimentally validated in this paper using simultaneous velocity and surface pressure measurement on a 1 : 50 model of the Texas Tech University experimental building in a wind tunnel simulated atmospheric boundary layer. Flow visualization gives further insight into the nature of peak suction events. The flow model is shown to account for the increase in suction towards the roof corner as well as the presence of the highest suction at wind angles of $60^{\circ}$. It includes a parameter describing vortex suction strength, which is shown to be related to the nature of the reattachment, and also suggests how different components of upstream turbulence could influence the surface pressure.

키워드

과제정보

연구 과제 주관 기관 : US National Science Foundation

참고문헌

  1. Banks, D. (2000), "The suction induced by conical vortices on low-rise buildings with flat roofs", Ph.D. Dissertation, Civil Engineering Department, Colorado State University, Fort Collins, CO.
  2. Banks, D. and Meroney, R. N. (2000a), "The applicability of quasi-steady theory to pressure statistics beneath roof-top vortices", (accepted for publication) J. of Wind Eng. Ind. Aerod.
  3. Banks, D. and Meroney, R. N. (2001), "A model of roof-top surface pressures produced by conical vortices: Model development", Wind and Structures, 4(3), 227-246. https://doi.org/10.12989/was.2001.4.3.227
  4. 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. Aerodyn., 84(1), 65-85. https://doi.org/10.1016/S0167-6105(99)00044-6
  5. Gartshore, I. S. (1973), "The effect of turbulence on the surface pressure field of a square prism", produced by University of Western Ontario, London, Ontario, BLWT-4-73.
  6. Ginger, J. D. and Letchford, C. W. (1992), "Peak wind loads under delta wing vortices on canopy roofs", J. Wind Eng. Ind. Aerodyn., 41-44, 1739-1750.
  7. Ham, H. J. (1998), "Turbulence effects on wind-induced building pressure", Doctor of Philosophy, Civil Engineering, Colorado State University, Fort Collins, Colorado.
  8. Ham, H. J. and Bienkiewicz, B. (1998), "Wind tunnel simulation of TTU flow and building roof pressure", J. Wind Eng. Ind. Aerodyn., 77 & 78, 119-133.
  9. Letchford, C. W. and Marwood, R. (1997), "On the influence of v & w component turbulence on roof pressures beneath conical vortices", J. Wind Eng. Ind. Aerodyn., 69-71, 567-577. https://doi.org/10.1016/S0167-6105(97)00187-6
  10. Li, Q. S., and Melbourne, W. H. (1995), "An experimental investigation of the effects of free-stream turbulence on streamwise surface pressures in separated and reattaching flows", J. Wind Eng. Ind Aerodyn., 54/55, 313-323. https://doi.org/10.1016/0167-6105(94)00050-N
  11. Lin, J.-X., Surry, D. and Tieleman, H. W. (1995), "The distribution of pressure near roof corners of flat roof buildings", J. Wind Eng. Ind. Aerodyn., 56, 235-265. https://doi.org/10.1016/0167-6105(94)00089-V
  12. Marwood, R. and Wood, C. J. (1997), "Conical vortex movement and its effect on roof pressures", J. Wind Eng. Ind. Aerodyn., 69-71, 589-595. https://doi.org/10.1016/S0167-6105(97)00189-X
  13. Melbourne, W. H. (1993), "Turbulence and the Leading Edge Phenomena", J. Wind Eng. Ind. Aerodyn., 49, 45-64. https://doi.org/10.1016/0167-6105(93)90005-9
  14. Minson and Wood (1992), "Investigation of separation bubbles and inclined edge vortices above model buildings using laser doppler anemometry", 11th Australasian fluid Mechanics Conference, University of Tasmania, Australia.
  15. Saathoff, P. J. and Melbourne, W. H. (1989), "The generation of peak pressures in separated / reattaching flows", J. Wind Eng. Ind. Aerodyn., 32, 121-134. https://doi.org/10.1016/0167-6105(89)90023-8
  16. Zhao, Z., Sarkar, P. P. and Mehta, K. C. (2001), "Wind flow characteristics and their loading effects on low-rise building roofs", (submitted to) Journal of Wind and Structures.

피인용 문헌

  1. Simplified Wind Flow Model for the Estimation of Aerodynamic Effects on Small Structures vol.139, pp.3, 2013, https://doi.org/10.1061/(ASCE)EM.1943-7889.0000508
  2. 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
  3. Simplified elements for wind-tunnel measurements with type-III-terrain atmospheric boundary layer vol.91, 2016, https://doi.org/10.1016/j.measurement.2016.05.078
  4. Characteristics of dynamic pressures on a saddle type roof in various boundary layer flows vol.150, 2016, https://doi.org/10.1016/j.jweia.2015.11.012
  5. Experiments to study turbulence and flow past a low-rise building at oblique incidence vol.99, pp.5, 2011, https://doi.org/10.1016/j.jweia.2011.02.005
  6. Wind Tunnel Analysis of the Aerodynamic Loads on Rolling Stock over Railway Embankments: The Effect of Shelter Windbreaks vol.2014, 2014, https://doi.org/10.1155/2014/421829
  7. Low-rise Buildings and Architectural Aerodynamics vol.48, pp.3, 2005, https://doi.org/10.3763/asre.2005.4833
  8. Influence of an upstream building on the wind-induced mean suction on the flat roof of a low-rise building vol.99, pp.8, 2011, https://doi.org/10.1016/j.jweia.2011.06.003
  9. The applicability of quasi-steady theory to pressure statistics beneath roof-top vortices vol.89, pp.6, 2001, https://doi.org/10.1016/s0167-6105(00)00092-1
  10. 대기경계층 내에 놓인 실린더의 자유단 형상변화가 후류유동에 미치는 영향에 관한 연구 vol.27, pp.1, 2001, https://doi.org/10.3795/ksme-b.2003.27.1.105
  11. Experimental investigation of the aerodynamics of a large industrial building with parapet vol.3, pp.1, 2021, https://doi.org/10.1186/s42774-021-00080-z