Advanced SearchSearch Tips
Wind direction field under the influence of topography: part II: CFD investigations
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Wind and Structures
  • Volume 22, Issue 4,  2016, pp.477-501
  • Publisher : Techno-Press
  • DOI : 10.12989/was.2016.22.4.477
 Title & Authors
Wind direction field under the influence of topography: part II: CFD investigations
Li, S.W.; Hu, Z.Z.; Tse, K.T.; Weerasuriya, A.U.;
Though hilly topography influences both wind speeds and directions aloft, only the influence on wind speeds, i.e. the speed-up effect, has been thoroughly investigated. Due to the importance of a model showing the spatial variations of wind directions above hilly terrains, it is worthwhile to systematically assess the applicability and limitations of the model describing the influence of hilly topographies on wind directions. Based on wind-tunnel test results, a model, which describes the horizontal and vertical variations of the wind directions separately, has been proposed in a companion paper. CFD (Computational Fluid Dynamics) techniques were employed in the present paper to evaluate the applicability of the proposed model. From the investigation, it has been found that the model is acceptable for describing the vertical variation of wind directions by a shallow hill whose primary-to-secondary axis ratio (aspect ratio) is larger than 1. When the overall hill slope exceeds , the proposed model should be used with caution. When the aspect ratio is less than 1, the proposed model is less accurate in predicting the spatial variation of wind directions in the wake zone in a separated flow. In addition, it has been found that local slope of a hill has significant impact on the applicability of the proposed model. Specifically, the proposed model is only applicable when local slope of a hill varies gradually from 0 (at the hill foot) to the maximum value (at the mid-slope point) and then to 0 (at the hill top).
computation;topography;wind characteristics;direction changes;
 Cited by
Wind direction field under the influence of topography, part I: A descriptive model,;;;;

Wind and Structures, 2016. vol.22. 4, pp.455-476 crossref(new window)
Simulation of twisted wind flows in a boundary layer wind tunnel for pedestrian-level wind tunnel tests, Journal of Wind Engineering and Industrial Aerodynamics, 2016, 159, 99  crossref(new windwow)
New inflow boundary conditions for modeling twisted wind profiles in CFD simulation for evaluating the pedestrian-level wind field near an isolated building, Building and Environment, 2018  crossref(new windwow)
A wind tunnel study of effects of twisted wind flows on the pedestrian-level wind field in an urban environment, Building and Environment, 2018, 128, 225  crossref(new windwow)
Long term modelling of the dynamical atmospheric flows over SIRTA site, Journal of Wind Engineering and Industrial Aerodynamics, 2018, 172, 351  crossref(new windwow)
Pedestrian-level wind environment around isolated buildings under the influence of twisted wind flows, Journal of Wind Engineering and Industrial Aerodynamics, 2017, 162, 12  crossref(new windwow)
Balogh, M., Parente, A. and Benocci, C. (2012), "RANS simulation of ABL flow over complex terrains applying an Enhanced k-e model and wall function formulation: Implementation and comparison for fluent and OpenFOAM", J. Wind Eng. Ind. Aerod., 104-106, 360-368. crossref(new window)

Bitsuamlak, G.T., Stathopoulos, T. and Bedard, C. (2004), "Numerical evaluation of wind flow over complex terrain: Review", J. Aerospace Eng., 17(4), 135-145. crossref(new window)

Bitsuamlak, G., Stathopoulos, T. and Bedard, C. (2006), "Effects of upstream two-dimensional hills on design wind loads: a computational approach", Wind Struct., 9(1), 37-58. crossref(new window)

Derickson, R. and Peterka, J.A. (2004), "Development of a powerful hybrid tool for evaluating wind power in complex terrain: Atmospheric numerical models and wind tunnels", Proceedings of the 23rd ASME Wind Energy Symposium, Reno, Nevada.

Engineering Science Data Unit (1993), Mean wind speeds over hills and other topography, Section No. 91043, London: IHS ESDU.

Hitchcock, P.A., Kwok, K.C.S., Wong, K.S. and Shum, K.M. (2010), "The effects of topography on local wind-induced pressures of a medium-rise building", Wind Struct., 13(5), 433-449. crossref(new window)

Jackson, P.S. and Hunt, J.C.R. (1975), "Turbulent wind flow over a low hill", Q. J. Roy. Meteorol. Soc., 101(430), 929-955. crossref(new window)

Jazcilevich, A.D., Garcia, A.R. and Caetano, E. (2005), "Locally induced surface air confluence by complex terrain and its effects on air pollution in the valley of Mexico", Atmos. Environ., 39(30), 5481-5489. crossref(new window)

Kim, H.G., Patel, V.C. and Lee, M.C. (2000), "Numerical simulation of wind flow over hilly terrain", J. Wind Eng. Ind. Aerod., 87(1), 45-60. crossref(new window)

Lindley, D., Neal, D., Pearse, J. and Stevenson, D. (1981), "The effect of terrain and construction method on the flow over complex terrain models in a simulated atmospheric boundary layer", Proceedings of the 3rd British Wind Energy Association Wind Energy Conference, Cranfield, UK.

Liu, B., Qu, J., Zhang, W. and Qian, G. (2011), "Numerical simulation of wind flow over transverse and pyramid dunes", J. Wind Eng. Ind. Aerod., 99(8), 879-888. crossref(new window)

Lubitz, W.D. and White, B.R. (2007), "Wind-tunnel and field investigation of the effect of local wind direction on speed-up over hills", J. Wind Eng. Ind. Aerod., 95(8), 639-661. crossref(new window)

Mason, P.J. and Sykes, R.I. (1979), "Flow over an isolated hill of moderate slope", Q. J. Roy. Meteorol. Soc., 105(444), 383-395. crossref(new window)

Miller, C.A. and Davenport, A.G. (1998), "Guidelines for the calculation of wind speed-ups in complex terrain", J. Wind Eng. Ind. Aerod., 74-76, 189-197. crossref(new window)

Palma, J., Castro, F., Ribeiro, L., Rodrigues, H. and Pinto, A. (2008), "Linear and nonlinear models in wind resource assessment and wind turbine micro-siting in complex terrain", J. Wind Eng. Ind. Aerod., 96(12), 2308-2326. crossref(new window)

Snyder, W. (1973), "Similarity criteria for the application of fluid models to the study of air pollution meteorology", Bound.-Lay. Metrol., 3(1), 113-134.

Sumner, J., Watters, C.S. and Masson, C. (2010), "CFD in wind energy: the virtual, multiscale wind tunnel", Energies, 3(5), 989-1013. crossref(new window)

Taylor, P.A., Walmsley, J.L. and Salmon, J.R. (1983), "A simple model of neutrally stratified boundary-layer flow over real terrain incorporating wavenumber-dependent scaling", Bound.-Lay. Metrol., 26(2), 169-189. crossref(new window)

Tominaga, Y., Mochida, A., Yoshie, R., Kataoka, H., Nozu, T., Yoshikawa, M. and Shirasawa, T. (2008). "AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings", J. Wind Eng. Ind. Aerod., 96(10-11), 1749-1761. crossref(new window)

Uchida, T. and Ohya, Y. (2003), "Large-eddy simulation of turbulent airflow over complex terrain", J. Wind Eng. Ind. Aerod., 92(1-2), 219-229.

Weerasuriyaa, A.U., Hu, Z.Z., Li, S.W. and Tse, K.T. (2016), "Wind direction field under the influence of topography, Part I: A descriptive model", Wind Struct., Accepted.

Yang, Y., Gu, M., Chen, S. and Jin, X. (2009), "New inflow boundary conditions for modelling the neutral equilibrium atmospheric boundary layer in computational wind engineering", J. Wind Eng. Ind. Aerod,, 97(2), 88-95. crossref(new window)