Wind and Structures

  • 제30권3호
  • /
  • Pages.231-243
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  • 2020
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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Numerical characterization of downburst wind field at WindEEE dome

  • 투고 : 2018.08.28
  • 심사 : 2019.12.22
  • 발행 : 2020.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

Downbursts are acknowledged for being a major loading hazard for horizontally-extending structures like transmission line systems. With these structures being inherently flexible, it is important to characterize the turbulence associated with the wind flow of downburst events being essential to quantify dynamic excitations on structures. Accordingly, the current study numerically characterizes the downburst wind field of open terrain simulated at the Wind Engineering, Energy and Environment (WindEEE) dome testing facility at The University of Western Ontario in Canada through a high-resolution large eddy simulation (LES). The study validates the numerical simulation considering both the mean and the turbulent components of the flow. It then provides a detailed visual description of the flow at WindEEE through the capabilities enabled by LES to identify the key factors affecting the flow. The study also presents the spatial distribution of turbulence intensities and length scales computed from the numerical model and compares them with previous values reported in the literature. The comparison shows the ability of the downburst simulated at WindEEE to reproduce turbulence characteristics similar to those reported from field measurements. The study also indicates that downburst turbulence is well-correlated circumferentially which imposes high correlated loads on horizontally-distributed structures such as transmission lines.

키워드

과제정보

The authors would like gratefully acknowledge the financial support of Hydro One Inc., the National Research Council of Canada (NSERC) as well as the Ontario Centres of Excellence (OCE). The authors are also acknowledging the technical collaboration and advice provided by the WindEEE Research Institute knowledgeable staff. Also, the authors are grateful to Dr. Amal Elawady at FIU for sharing and explaining the experimental wind-field data. Lastly, the computational work could not be realized without the resources and technical support of SHARCNET high performance computing platform.

참고문헌

  1. Aboshosha, H. and El Damatty, A. (2015), "Engineering method for estimating the reactions of transmission line conductors under downburst winds", Eng. Struct., 99, 272-284. https://doi.org/10.1016/j.engstruct.2015.04.010.
  2. Aboshosha, H., Bitsuamlak, G. and El Damatty, A. (2015a), "Turbulence characterization of downbursts using LES", J. Wind Eng. Ind. Aerod., 136, 44-61. https://doi.org/10.1016/j.jweia.2014.10.020.
  3. Aboshosha, H., Elawady, A., El Ansary, A. and El Damatty, A., (2016), "Review on dynamic and quasi-static buffeting response of transmission lines under synoptic and non-synoptic winds", Eng. Struct., 112(1), 23-46. https://doi.org/10.1016/j.engstruct.2016.01.003.
  4. Aboshosha, H., Elshaer, A., Bitsuamlak, G.T. and El Damatty, A. (2015b), "Consistent inflow turbulence generator for LES evaluation of wind-induced responses for tall buildings", J. Wind Eng. Ind. Aerod., 142, 198-216. https://doi.org/10.1016/j.jweia.2015.04.004.
  5. ANSYS Inc. (2016), ANSYS(R) FLUENT, Release 17.0, Theory Guide.
  6. Chay, M.T. and Letchford, C.W. (2002), "Pressure distributions on a cube in a simulated thunderstorm downburst. Part B: moving downburst observations", J. Wind Eng. Ind. Aerod., 90(7), 733-753. https://doi.org/10.1016/S0167-6105(02)00163-0.
  7. Chay, M.T., Albermani, F. and Wilson, R. (2006), "Numerical and analytical simulation of downburst wind loads", Eng. Struct., 28(2), 240-254. https://doi.org/10.1016/j.engstruct.2005.07.007.
  8. Chen, L. and Letchford, C.W. (2004), "A deterministic-stochastic hybrid model of downbursts and its impact on a cantilevered structure", Eng. Struct. 26(5), 619-629. https://doi.org/10.1016/j.engstruct.2003.12.009.
  9. Choi, E.C.C. (2004), "Field measurement and experimental study of wind speed profile during thunderstorms", J. Wind Eng. Ind. Aerod., 92(3-4), 275-290. https://doi.org/10.1016/j.jweia.2003.12.001.
  10. Das, K.K., Ghosh, A.K. and Sinhamahapatra, K.P. (2011), "Physical simulation of dry microburst using impinging jet model with swirl", Int. J. Eng. Sci. Technol., 3(5), 20-29.
  11. Dempsey, D. and White, H.B. (1996), "Winds wreak havoc on lines", Transm. Distrib. World, 48(6), 32-42.
  12. Elawady, A., Aboshosha, H., El Damatty, A., Bitsuamlak, G., Hangan, H. and Elatar, A. (2017), "Aero-elastic testing of multi-spanned transmission line subjected to downbursts", J. Wind Eng. Ind. Aerod., 169, 194-216. https://doi.org/10.1016/j.jweia.2017.07.010.
  13. Elawady, A., Aboshosha, H., El Damatty, A.A. and Bitsuamlak, G. (2016), "Wind tunnel testing of a multiple span aeroelastic transmisson line subjected to downburst wind in resilient infrastructure", CSCE 2016, ID538.
  14. Elawady, A., El Damatty, A.A. (2016), "Longitudinal force on transmission towers due to non-symmetric downburst conductor loads", Eng. Struct., 127(15), 206-226. https://doi.org/10.1016/j.engstruct.2016.08.030.
  15. Elshaer, A., Aboshosha, H., Bitsuamlak, G., El Damatty, A.A. and Dagnew, A. (2016), "LES evaluation of wind-induced responses for an isolated and a surrounded tall building", Eng. Struct., 115, 179-195. https://doi.org/10.1016/j.engstruct.2016.02.026.
  16. Germano, M., Piomelli, U., Moin, P. and Cabot, W.H. (1991), "A dynamic subgrid-scale eddy viscosity model", Phys. Fluids, 3, 1760. https://doi.org/10.1063/1.857955.
  17. Gunter, W.S. and Schroeder, J.L. (2015). "High-resolution full-scale measurements of thunderstorm outflow winds", J. Wind Eng. Ind. Aerod., 138, 13-26. https://doi.org/10.1016/j.jweia.2014.12.005.
  18. Hadziabdic, M. (2005), "LES, RANS and Combined Simulation of Impinging Flows and Heat Transfer. Simulation", Ph.D. Dissertation, Technical University of Delft. The Netherlands.
  19. Hjelmfelt, M.R. (1988), "Structure and life cycle of microburst outflows observed in Colorado", J. Appl. Meteorol., 27(8), 900-927. https://doi.org/10.1175/1520-0450(1988)027%3C0900:SALCOM%3E2.0.CO;2.
  20. Holmes, J.D., Hangan, H.M., Schroeder, J.L., Letchford, C.W. and Orwig, K.D. (2008), "A forensic study of the Lubbock-Reese downdraft of 2002", Wind Struct., 11(2), 137-152. https://doi.org/10.12989/was.2008.11.2.137.
  21. Kim, J. and Hangan, H. (2007), "Numerical simulations of impinging jets with application to downbursts", J. Wind Eng. Ind. Aerod., 95(4), 279-298. https://doi.org/10.1016/j.jweia.2006.07.002.
  22. Kwon, D.K. and Kareem, A. (2009), "Gust-front factor: new framework for wind load effects on structures", J. Struct. Eng., 135(6), 717-732. https://doi.org/10.1061/(ASCE)0733-9445(2009)135:6(717).
  23. Li, C.Q. (2000), "A stochastic model of severe thunderstorms for transmission line design", Probabilistic Eng. Mech., 15(4), 359-364. https://doi.org/10.1016/S0266-8920(99)00037-5.
  24. Li, H. and Ou, J. (2012), "Experimental simulation of downburst-generated wind loading on building structure", The Seventh International Colloquium on Bluff Body Aerodynamics and Applications, Shanghai, China.
  25. Lilly, D.K. (1992), "A proposed modification of the Germano subgrid-scale closure method", Phys. Fluids. 4(3) 633.-635. https://doi.org/10.1063/1.858280.
  26. Lin, W.E., Orf, L., Savory, E. and Novacco, C. (2007), "Proposed large-scale modelling of the transient features of a downburst outflow", Wind Struct., 10(4), 315-346. https://doi.org/10.12989/was.2007.10.4.315
  27. Lombardo, F.T., Smith, D.A., Schroeder, J.L. and Mehta, K.C. (2014), "Thunderstorm characteristics of importance to wind engineering", J. Wind Eng. Ind. Aerod., 125, 121-132. https://doi.org/10.1016/j.jweia.2013.12.004.
  28. Mason, M.S., Fletcher, D.F. and Wood, G.S. (2010), "Numerical simulation of idealised three-dimensional downburst wind fields", Eng. Struct., 32(11), 3558-3570. https://doi.org/10.1016/j.engstruct.2010.07.024.
  29. Mason, M.S., Letchford, C.W. and James, D.L. (2005), "Pulsed wall jet simulation of a stationary thunderstorm downburst, Part A: Physical structure and flow field characterization", J. Wind Eng. Ind. Aerod., 93(7), 557-580. https://doi.org/10.1016/j.jweia.2005.05.006.
  30. Mason, M.S., Wood, G.S. and Fletcher, D.F. (2009), "Numerical simulation of downburst winds", J. Wind Eng. Ind. Aerod., 97(11-12), 523-539. https://doi.org/10.1016/j.jweia.2009.07.010.
  31. McConville, A.C., Sterling, M. and Baker, C.J. (2009), "The physical simulation of thunderstorm downbursts using an impinging jet", Wind Struct., 12(2), 133-139. http://doi:10.12989/was.2009.12.2.133.
  32. Orwig, K.D. and Schroeder, J.L. (2007), "Near-surface wind characteristics of extreme thunderstorm outflows", J. Wind Eng. Ind. Aerod., 95(7), 565-584. https://doi.org/10.1016/j.jweia.2006.12.002.
  33. Otsuka, K. (2006), "Effects of topography on the surface wind of an isolated wet microburst", The Fourth International Symposium on Computational Wind Engineering. Yokohama, Japan.
  34. Sengupta, A. and Sarkar, P.P. (2008), "Experimental measurement and numerical simulation of an impinging jet with application to thunderstorm microburst winds", J. Wind Eng. Ind. Aerod., 96(3), 345-365. https://doi.org/10.1016/j.jweia.2007.09.001.
  35. Sengupta, A., Haan, F.L., Sarkar, P.P. and Balaramudu, V. (2008), "Transient loads on buildings in microburst and tornado winds", J. Wind Eng. Ind. Aerod., 96(10-11), 2173-2187. https://doi.org/10.1016/j.jweia.2008.02.050.
  36. Solari, G., Burlando, M., Gaetano, P. De and Repetto, M.P. (2015a), "Characteristics of thunderstorms relevant to the wind loading of structures", Wind Struct., 20(6), 763-791. http://dx.doi.org/10.12989/was.2015.20.6.763.
  37. Solari, G., De Gaetano, P. and Repetto, M.P. (2015b), "Thunderstorm response spectrum: fundamentals and case study", J. Wind Eng. Ind. Aerod., 143, 62-77. https://doi.org/10.1016/j.jweia.2015.04.009.
  38. Tamura, Y. and Kareem, A. (2013), "Advanced Structural Wind Engineering", Springer, Berlin, Germany.
  39. Theodore Fujita, T. (1985), "The downburst: microburst and macroburst", Report of Projects NIMROD and JAWS, University of Chicago. Chicago. U.S.A.
  40. Vermeire, B.C., Orf, L.G. and Savory, E. (2011), "Improved modelling of downburst outflows for wind engineering applications using a cooling source approach", J. Wind Eng. Ind. Aerod., 99(8), 801-814. https://doi.org/10.1016/j.jweia.2011.03.003.
  41. Wolfson, M.M., DiStefano, J.T. and Fujita, T.T. (1985), "Low altitude wind shear in the Memphis, TN area based on Mesonet and LLWAS data", In Preprints, 14th Conf. on Severe Local Storms, Indianapolis, IN, Amer. Meteor. Soc.
  42. Wood, G.S., Kwok, K.C.S., Motteram, N.A. and Fletcher, D.F. (2001), "Physical and numerical modelling of thunderstorm downbursts", J. Wind Eng. Ind. Aerod., 89(6), 535-552. https://doi.org/10.1016/S0167-6105(00)00090-8.
  43. Xu, Z. and Hangan, H. (2008), "Scale, boundary and inlet condition effects on impinging jets", J. Wind Eng. Ind. Aerod., 96(12), 2383-2402. https://doi.org/10.1016/j.jweia.2008.04.002.
  44. Zhang, S., Solari, G., De Gaetano, P., Burlando, M. and Repetto, M.P. (2017), "A refined analysis of thunderstorm outflow characteristics relevant to the wind loading of structures", Probabilistic Eng. Mech., 54, 9-24. https://doi.org/10.1016/j.probengmech.2017.06.003.
  45. Zhang, Y., Hu, H. and Sarkar, P.P. (2013), "Modeling of microburst outflows using impinging jet and cooling source approaches and their comparison", Eng. Struct., 56, 779-793. https://doi.org/10.1016/j.engstruct.2013.06.003.

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