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Influence of tilt and surface roughness on the outflow wind field of an impinging jet

  • Mason, M.S. (School of Civil Engineering, University of Sydney) ;
  • Wood, G.S. (Cermak Peterka Petersen) ;
  • Fletcher, D.F. (School of Chemical and Biomolecular Engineering, University of Sydney)
  • 투고 : 2008.08.09
  • 심사 : 2009.01.30
  • 발행 : 2009.05.25

초록

A physical and numerical steady flow impinging jet has been used to simulate the bulk characteristics of a downburst-like wind field. The influence of downdraft tilt and surface roughness on the ensuing wall jet flow has been investigated. It was found that a simulated downdraft impinging the surface at a non-normal angle has the potential for causing larger structural loads than the normal impingement case. It was also found that for the current impinging jet simulations, surface roughness played a minor role in determining the storm maximum wind structure, but this influence increased as the wall jet diverged. However, through comparison with previous research it was found that the influence of surface roughness is Reynolds number dependent and therefore may differ from that reported herein for full-scale downburst cases. Using the current experimental results an empirical model has been developed for laboratory-scale impinging jet velocity structure that includes the influence of both jet tilt and surface roughness.

키워드

참고문헌

  1. ANSYS (2007), CFX 11.0, see http://www.ansys.com/Products/cfx.asp.
  2. 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
  3. 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. Aerod., 90(7), 711-732. https://doi.org/10.1016/S0167-6105(02)00158-7
  4. 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
  5. Cooper, D., Jackson, D.C., Launder, B.E. and Liao, G.X. (1993), "Impinging jet studies for turbulence model assessment--I. Flow-field experiments", Int. J. Heat Mass Tran., 36(10), 2675 -2684. https://doi.org/10.1016/S0017-9310(05)80204-2
  6. Fujita, T.T. (1983), Andrews AFB Microburst, SMRP Research Paper 205, Chicago.
  7. Fujita, T.T. (1985), The Downburst: Microburst and Macroburst, Satellite and Mesometeorology Research Project (SMRP) 210, Chicago.
  8. Fujita, T.T. (1990), "Downbursts: meteorological features and wind field characteristics", J. Wind Eng. Ind. Aerod., 36(1-3), 75-86. https://doi.org/10.1016/0167-6105(90)90294-M
  9. Gomes, L. and Vickery, B.J. (1976), On thunderstorm wind gusts in Australia, Civil Engineering Transactions, Institute of Engineers Australia, 18, 33-39.
  10. 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<0900:SALCOM>2.0.CO;2
  11. Holmes, J.D. (2002), "A re-analysis of recorded extreme wind speeds in Region A", Australian Journal of Structural Engineering, 4(1), 29-40. https://doi.org/10.1080/13287982.2002.11464905
  12. Holmes, J.D. and Oliver, S.E. (2000), "An empirical model of a downburst", Eng. Struct., 22(9), 1167-1172. https://doi.org/10.1016/S0141-0296(99)00058-9
  13. Holmes, J.D., Hangan, H., 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.
  14. International Organisation for Standardization (1998), ISO 6344-1:1988(E) Coated Abrasives - Grain size analysis - Part 1: Grain size distribution test, International Organisation for Standardization, Geneve, Switzerland.
  15. Ivan, M. (1986), "A ring-vortex downburst model for flight simulations", J. Aircraft, 23(3), 232-236. https://doi.org/10.2514/3.45294
  16. Knowles, K. and Myszko, M. (1998), "Turbulence measurements in radial wall-jets", Exp. Therm. Fluid Sci., 17(1-2), 71-78. https://doi.org/10.1016/S0894-1777(97)10051-6
  17. Laufer, J. (1954), The structure of turbulence in fully developed pipe flow, National Advisory committee for Aeronautics 1174, Washington.
  18. 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. Aerod., 90(12-15), 1415-1433. https://doi.org/10.1016/S0167-6105(02)00262-3
  19. Mason, M.S. and Wood, G.S. (2005), "Influence of jet inclination on structural loading in an experimentally simulated microburst", 5th Asia-Pacific Conf. on Wind Engineering, Seoul, South Korea.
  20. Mason, M.S., Wood, G.S. and Fletcher, D.F. (2007), "Impinging jet simulation of stationary downburst flow over topography", Wind Struct., 10(5), 25.
  21. Mason, M.S. (2009), "Simulation of downburst wind fields", PhD Dissertation, University of Sydney, Sydney, Australia.
  22. Mousley, P. (2002), TFI Probe User's Guide, see www.turbulentflow.com.au.
  23. 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
  24. Oseguera, R.M. and Bowles, R.L. (1988), A simple, analytic 3-dimensional downburst model based on boundary layer stagnation flow, NASA Technical Memorandum 100632.
  25. Ponte, J. Jr. and Riera, J.D. (2007), "Wind velocity field during thunderstorms", Wind Struct., 10(3), 287-300. https://doi.org/10.12989/was.2007.10.3.287
  26. 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
  27. Proctor, F.H. (1993), "Case study of a low-reflectivity pulsating microburst: numerical simulation of the Denver, 8 July 1989, storm", 17th Conf. on Severe Local Storms, St. Louis, Missouri, 4-8 October.
  28. 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
  29. Twisdale, L.A. and Vickery, P.J. (1992), "Research on thunderstorm wind design parameters", J. Wind Eng. Ind. Aerod., 41(1-3), 545-556. https://doi.org/10.1016/0167-6105(92)90461-I
  30. Vicroy, D.D. (1991), A simple, analytical, axisymmetric microburst model for downdraft estimation, NASA Technical Memorandum 104053.
  31. White, F.M. (1991), Viscous Fluid Flow, McGraw-Hill.
  32. Whittingham, H.E. (1964), Extreme wind gusts in Australia, Commonwealth Bureau of Meteorology Bulletin 46
  33. Wilson, J.W., Roberts, R.D., Kessinger, C. and McCarthy, J. (1984), "Microburst wind structure and evaluation of Doppler radar for airport wind shear detection", J. Appl. Meteorol., 23(6), 898-915. https://doi.org/10.1175/1520-0450(1984)023<0898:MWSAEO>2.0.CO;2
  34. 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
  35. Xu, Z. and Hangan, H. (2008), "Scale, boundary and inlet condition effects on impinging jets", J. Wind Eng. Ind. Aerod., 96(12), 2383-2403. https://doi.org/10.1016/j.jweia.2008.04.002
  36. Xu, Z., Hangan, H. and Yu, P. (2008), "Analytical solutions for a family of Gaussian impinging jets", J. Appl. Mech., 75(2), 021019. https://doi.org/10.1115/1.2775502
  37. Zhu, S. and Etkin, B. (1985), "Model of wind field in a downburst", J. Aircraft, 22(7), 595-601. https://doi.org/10.2514/3.45171

피인용 문헌

  1. A revised empirical model and CFD simulations for 3D axisymmetric steady-state flows of downbursts and impinging jets vol.102, 2012, https://doi.org/10.1016/j.jweia.2011.12.004
  2. Assessment of vertical wind loads on lattice framework with application to thunderstorm winds vol.13, pp.5, 2010, https://doi.org/10.12989/was.2010.13.5.413