Wind and Structures

Techno-Press (테크노프레스)
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The effect of small embankments on wind speeds

  • Quinn, A.D. (Environment Group, Silsoe Research Institute) ;
  • Robertson, A.P. (Environment Group, Silsoe Research Institute) ;
  • Hoxey, R.P. (Environment Group, Silsoe Research Institute) ;
  • Short, J.L. (Environment Group, Silsoe Research Institute) ;
  • Burgess, L.R. (Environment Group, Silsoe Research Institute) ;
  • Smith, B.W. (Flint & Neill Partnership)
  • Published : 1998.12.25
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Abstract

Full-scale measurements have been made to determine the increase in wind speed over two exposed embankments, one of $23^{\circ}$ slope and 4.7 m in height, the other of $24^{\circ}$ slope and 7.3 m in height. Measurements were made at heights of 5, 10 and 15 m above the upper edge of each embankment and at the same heights approximately 100 m upwind in the lower-level approach fetch. Despite the modest sizes of the embankments, the maximum recorded increase in mean wind speed was 28% and the minimum was 13%; these increase relate to increases in wind loads on structures erected at the top of the embankments of 64% and 28% respectively. The associated increases in gust speeds are estimated at 33% and 18%, which imply increases in gust loading of 77% and 39% respectively. These experimental results are compared with predictions obtained from a computational fluid dynamics (CFD) analysis, using three high Reynolds number eddy-viscosity models and estimates from the UK wind loading code, BS 6399: Part 2. The CFD results are generally in agreement with the experimental data, although near-ground effects on the embankment crest are poorly reproduced.

Keywords

References

  1. Bowen, A.J. (1983), "The prediction of mean wind speeds above simple 2D hill shapes", J. Wind Eng. Ind. Aero., 15, 259-270. https://doi.org/10.1016/0167-6105(83)90196-4
  2. BS 6399: Loading for buildings: Part 2: Code of practice for wind loads: 1997. British Standards Institution, London.
  3. ENV 1991-2-4: 1995 Eurocode 1: Basis of design and actions on structures. Part 2.4 Actions on structures-Wind actions. 1997. British Standards Institution, London.
  4. Hunt, J.C.R. (1980). Wind over hills, in Workshop on the planetary boundary layer, 107-149, J.C. Wyngaard (ed), American Meteorological Society, Boston.
  5. Launder, B.E. and Spalding, D.B. (1974), "The numerical computation of turbulent flows", Comput. Methods Appl. Mech. Eng., 3, 269-289. https://doi.org/10.1016/0045-7825(74)90029-2
  6. Paterson, D.A. and Holmes, J.D. (1993), "Computation of wind flow over topography" , J. Wind Eng. Ind. Aero., 46-47, 471-476. https://doi.org/10.1016/0167-6105(93)90314-E
  7. Richards, P.J. and Hoxey, R.P. (1993), "Appropriate boundary conditions for computational wind engineering models using the ${\kappa}-{\varepsilon}$ turbulence model", J. Wind Eng. Ind. Aero., 46-47, 145-153. https://doi.org/10.1016/0167-6105(93)90124-7
  8. Tsuchiya, M., Murakami, S. Mochida, A., Kondo, K. and Ishida, Y. (1997), "Development of a new ${\kappa}-{\varepsilon}$ model for flow and pressure fields around bluff body", J. Wind Eng. Ind. Aero., 67-68, 169-182. https://doi.org/10.1016/S0167-6105(97)00071-8
  9. Yakhot, v. and Orszag, S.A. (1986), "Renormalization group analysis of turbulence" , Journal of Scientific Computing, 1(1), 3-51. https://doi.org/10.1007/BF01061452
  10. Zeman, O. and Jensen, N.O. (1987), "Modification of turbulence characteristics in flow over hills", Q. J. R Meteorol. Soc., 113, 55-80. https://doi.org/10.1002/qj.49711347505

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