Wind and Structures

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Proposed large-scale modelling of the transient features of a downburst outflow

  • Lin, W.E. (Department of Mechanical & Materials Engineering, The University of Western Ontario) ;
  • Orf, L.G. (Department of Geography (Meteorology), Central Michigan University) ;
  • Savory, E. (Department of Mechanical & Materials Engineering,The University of Western Ontario) ;
  • Novacco, C. (Department of Mechanical & Materials Engineering,The University of Western Ontario)
  • Received : 2006.12.31
  • Accepted : 2007.03.28
  • Published : 2007.08.25
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Abstract

A preceding companion article introduced the slot jet approach for large-scale quasi-steady modelling of a downburst outflow. This article extends the approach to model the time-dependent features of the outflow. A two-dimensional slot jet with an actuated gate produces a gust with a dominant roll vortex. Two designs for the gate mechanism are investigated. Hot-wire anemometry velocity histories and profiles are presented. As well, a three-dimensional, subcloud numerical model is used to approximate the downdraft microphysics, and to compute stationary and translating outflows at high resolution. The evolution of the horizontal and vertical velocity components is examined. Comparison of the present experimental and numerical results with field observations is encouraging.

Keywords

References

  1. Alahyari, A. A. (1995), "Dynamics of laboratory simulated microbursts", University of Minnesota, PhD thesis, December.
  2. Alahyari, A. and Longmire, E. K. (1995), "Dynamics of experimentally simulated microbursts", AIAA J., 33(11), 2128-2136. https://doi.org/10.2514/3.12957
  3. Arakawa, A. and Lamb, V. R. (1977), "Computational design of the basic dynamical processes of the UCLA general circulation model", Methods in Computational Physics, editor: J. Chang, Academic Press, New York, NY, USA, 17, 173-265.
  4. Bakke, P. (1957), "An experimental investigation of a wall jet", J. Fluid Mech., 2, 467-472. https://doi.org/10.1017/S0022112057000270
  5. Bryan, G. H. and Fritsch, J.M. (2002), "A benchmark simulation for moist nonhydrostatic numerical models", Mon. Wea. Rev., 130(12), 2917-2928. https://doi.org/10.1175/1520-0493(2002)130<2917:ABSFMN>2.0.CO;2
  6. Caracena, F. (1982), "Is the microburst a large vortex ring imbedded in a thunderstorm downdraft?", EOS Transactions of the American Geophysical Union, 63, 899.
  7. Charba, J. (1974), "Application of gravity current model to analysis of squall-line gust front", Mon. Wea. Rev., 102(2), 140-156. https://doi.org/10.1175/1520-0493(1974)102<0140:AOGCMT>2.0.CO;2
  8. Chay, M. T. and Letchford, C. W. (2002), "Pressure distributions on a cube in a simulated thunderstorm downburst - Part A: stationary downburst observations", J. Wind Eng. Ind. Aerodyn., 90, 711-732. https://doi.org/10.1016/S0167-6105(02)00158-7
  9. Chen, L. and Letchford, C. W. (2004), "A deterministic-stochastic hybrid model of downbursts and its impact on a cantilevered structure", Eng. Struct., 26, 619-629. https://doi.org/10.1016/j.engstruct.2003.12.009
  10. Chen, L. and Letchford, C. W. (2005), "Proper orthogonal decomposition of two vertical profiles of full-scale nonstationary downburst wind speeds", J. Wind Eng. Ind. Aerodyn., 93, 187-216. https://doi.org/10.1016/j.jweia.2004.11.004
  11. Chen, L. and Letchford, C. W. (2006), "Multi-scale correlation analyses of two lateral profiles of full-scale downburst wind speeds", J. Wind Eng. Ind. Aerodyn., 94, 675-696. https://doi.org/10.1016/j.jweia.2006.01.021
  12. Choi, E. C. C. and Hidayat, F. A. (2002), "Dynamic response of structures to thunderstorm winds", Prog. Struct. Eng. Mater., 4, 408-416. https://doi.org/10.1002/pse.132
  13. Doviak, R. J. and Zrni , D. S. (1988), "The Doppler weather radar", in Aspects of Modern Radar, editor: E. Brookner, Artech House, Norwood, MA, USA, 487-561.
  14. Droegemeier, K. K. and Wilhelmson, R. B. (1987), "Numerical simulation of thunderstorm outflow dynamics. Part I: Outflow sensitivity experiments and turbulence dynamics", J. Atmos. Sci., 44(8), 1180-1210. https://doi.org/10.1175/1520-0469(1987)044<1180:NSOTOD>2.0.CO;2
  15. Fujita, T. T. (1981), "Tornadoes and downbursts in the context of generalized planetary scales", J. Atmos. Sci., 38(8), 1511-1534. https://doi.org/10.1175/1520-0469(1981)038<1511:TADITC>2.0.CO;2
  16. Fujita, T. T. (1983), "Andrews AFB microburst", University of Chicago, Department of Geophysical Sciences, Satellite and Mesometeorology Research Project, Research Paper #205, 38 pp.
  17. Fujita, T. T. (1985), "The downburst: microburst and macroburst", University of Chicago, Department of Geophysical Sciences, Satellite and Mesometeorology Research Project, Research Paper #210, 128 pp.
  18. Gast, K. D. and Schroeder, J. L. (2003), "Supercell rear-flank downdraft as sampled in the 2002 Thunderstorm Outflow Experiment", Proceedings of the 11th International Conference on Wind Engineering, Lubbock, TX, USA, 2-5 June, 2233-2240.
  19. Gast, K. D. and Schroeder, J. L. (2004), "Extreme wind events observed in the 2002 Thunderstorm Outflow Experiment", 22nd Conference on Severe Local Storms, Hyannis, MA, USA, 4-8 October, Paper 7A.6.
  20. Goff, R. C. (1976), "Vertical structure of thunderstorm outflows", Mon. Wea. Rev., 104(11), 1429-1440. https://doi.org/10.1175/1520-0493(1976)104<1429:VSOTO>2.0.CO;2
  21. Hjelmfelt, M.R. (1988), "Structure and life cycle of microburst outflows observed in Colorado", J. Appl. Meteor., 27(8), 900-927. https://doi.org/10.1175/1520-0450(1988)027<0900:SALCOM>2.0.CO;2
  22. Holmes, J. D. and Hangan, H. M. (2006), "Some engineering aspects of convective downdrafts", The Boundary Layer Wind Tunnel Laboratory, The University of Western Ontario, BLWT-2-2006, July.
  23. Holmes, J. D. and Oliver, S. E. (2000), "An empirical model of a downburst", Eng. Struct., 22, 1167-1172. https://doi.org/10.1016/S0141-0296(99)00058-9
  24. Jorgensen, F.E. (2005), "How to measure turbulence with hot-wire anemometers - a practical guide", Dantec Dynamics A/S publication no. 9040U6154, Skovlunde, Denmark.
  25. Kim, J., Ho, T. C. E. and Hangan, H. (2005), "Downburst induced dynamic responses of a tall building", Proceedings of the 10th Americas Conference on Wind Engineering, Baton Rouge, USA, 31 May-4 June, CD-ROM.
  26. Klemp, J. B. and Wilhelmson, R. B. (1978), "The simulation of three-dimensional convective storm dynamics", J. Atmos. Sci., 35(6), 1070-1096. https://doi.org/10.1175/1520-0469(1978)035<1070:TSOTDC>2.0.CO;2
  27. Letchford, C. W. and Chay, M. T. (2002), "Pressure distributions on a cube in a simulated thunderstorm downburst-Part B: moving downburst observations", J. Wind Eng. Ind. Aerodyn., 90, 733-753. https://doi.org/10.1016/S0167-6105(02)00163-0
  28. Letchford, C. W., Mans, C. and Chay, M. T. (2002), "Thunderstorms - their importance in wind engineering (a case for the next generation wind tunnel)", J. Wind Eng. Ind. Aerodyn., 90(12-15), 1415-1433. https://doi.org/10.1016/S0167-6105(02)00262-3
  29. Lin, W. E. and Savory, E. (2006), "Large-scale quasi-steady modelling of a downburst outflow using a slot jet", Wind Struct., 9(6), 419-440. https://doi.org/10.12989/was.2006.9.6.419
  30. Linden, P. F. and Simpson, J. E. (1985), "Microbursts: a hazard for aircraft", Nature, 317, 601-602. https://doi.org/10.1038/317601a0
  31. Linden, P. F. and Simpson, J. E. (1986), "Gravity-driven flows in a turbulent fluid", J. Fluid Mech., 172, 481-497. https://doi.org/10.1017/S0022112086001829
  32. Lundgren, T. S., Yao, J. and Mansour, N. N. (1992), "Microburst modelling and scaling", J. Fluid Mech., 239, 461-488. https://doi.org/10.1017/S002211209200449X
  33. Mason, M., Letchford, C. W. and James, D. (2003), "Pulsed jet simulation of a thunderstorm downburst", Proceedings of the 11th International Conference on Wind Engineering, Lubbock, TX, USA, 2-5 June, 2249-2256.
  34. 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. Aerodyn., 93, 557-580. https://doi.org/10.1016/j.jweia.2005.05.006
  35. McNulty, R. P. (1991), "Downbursts from innocuous clouds: an example", Wea. Forecasting, 6(1), 148-154. https://doi.org/10.1175/1520-0434(1991)006<0148:DFICAE>2.0.CO;2
  36. Orf, L. G. and Anderson, J. R. (1999), "A numerical study of traveling microbursts", Mon. Wea. Rev., 127(6), 1244-1258. https://doi.org/10.1175/1520-0493(1999)127<1244:ANSOTM>2.0.CO;2
  37. Orf, L. G., Anderson, J. R. and Straka, J. M. (1996), "A three-dimensional numerical analysis of colliding microburst outflow dynamics", J. Atmos. Sci., 53(17), 2490-2511. https://doi.org/10.1175/1520-0469(1996)053<2490:ATDNAO>2.0.CO;2
  38. Proctor, F. H. (1988), "Numerical simulations of an isolated microburst. Part I: dynamics and structure", J. Atmos. Sci., 45(21), 3137-3160. https://doi.org/10.1175/1520-0469(1988)045<3137:NSOAIM>2.0.CO;2
  39. Proctor, F. H. (1989), "Numerical simulations of an isolated microburst. Part II: sensitivity experiments", J. Atmos. Sci., 46(14), 2143-2165. https://doi.org/10.1175/1520-0469(1989)046<2143:NSOAIM>2.0.CO;2
  40. Proctor F. H. and Han J. (1999), "Numerical study of wake vortex interaction with the ground using the Terminal Area Simulation System", 37th Aerospace Sciences Meeting & Exhibit, Reno, NV, USA, 11-14 January, AIAA-99-0754.
  41. Schlichting, H. (1979), Boundary-layer Theory, 7th edition, McGraw-Hill, New York, NY, USA.
  42. Selvam, R. P. and Holmes, J. D. (1992), "Numerical simulation of thunderstorm downdrafts", J. Wind Eng. Ind. Aerodyn., 41-44, 2817-2825.
  43. Stull, R. B. (1988), An Introduction to Boundary Layer Meteorology, Kluwer Academic Publishers, Boston, MA, USA.
  44. Stull, R. B. (1995), Meteorology Today for Scientists and Engineers: A Technical Companion Book, West Publishing Company, St. Paul, MN, USA.
  45. Verhoff, A. (1970), "Steady and pulsating two-dimensional turbulent wall jets in a uniform stream", Princeton University, PhD thesis.
  46. Wakimoto, R. M. (1985), "Forecasting dry microburst activity over the High Plains", Mon. Wea. Rev., 113(7), 1131-1143. https://doi.org/10.1175/1520-0493(1985)113<1131:FDMAOT>2.0.CO;2
  47. Wakimoto, R. M. (2001), "Convectively driven high wind events", Severe Convective Storms, Meteor. Monogr., editor: C.A. Doswell III, publisher: American Meteorological Society, 28(50), 255-298. https://doi.org/10.1175/0065-9401-28.50.255
  48. 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. Aerodyn., 89, 535-552. https://doi.org/10.1016/S0167-6105(00)00090-8
  49. Xu, Z. (2004), "Experimental and analytical modeling of high intensity winds", The University of Western Ontario, PhD thesis, December.
  50. Yao, J. and Lundgren, T. S. (1996), "Experimental investigation of microbursts", Exp. Fluids, 21, 17-25. https://doi.org/10.1007/BF00204631

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