Wind and Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Effects of vortex generators on the wind load of a flat roof: A computational study

  • Zhao, Yagebai (School of Civil Engineering, Northeast Forestry University) ;
  • Deng, Xiaolong (School of Civil Engineering, Northeast Forestry University) ;
  • Zhang, Hongfu (School of Civil Engineering, Northeast Forestry University) ;
  • Xin, Dabo (School of Civil Engineering, Northeast Forestry University) ;
  • Liu, Zhiwen (Hunan Provincial Key Laboratory of Wind Engineering and Bridge Engineering, Hunan University)
  • Received : 2019.06.21
  • Accepted : 2020.12.21
  • Published : 2021.01.25
⟨ Previous Next ⟩

Abstract

Vortex generators are commonly used in mechanical engineering and the aerospace industry to suppress flow separation owing to their advantages of simple structure, economic viability, and high level of efficiency. Owing to the flow separation of the incoming wind on the leading edge, a suction area is formed on the roof surface, which results in a lifting effect on the roof. In this research, vortex generators were installed on the windward surface of a flat roof and used to disturb to roof flow field and reduced suction based on flow control theory. Computational fluid dynamics (CFD) simulations were performed in this study to investigate the effects of vortex generators on reduce suction. It was determined that when the vortex generator was installed on the top of the roof on the windward surface, it had a significant control effect on reduce suction on the roof leading edge. In addition, the influence of parameters such as size, placement interval, and placement position of the vortex generator on the control effect of the roof's suction is also discussed.

Keywords

Acknowledgement

This research was supported by the National Natural Science Foundation of China (No. 51878131), the Fundamental Research Funds for the Central Universities (No. 2572019BJ06)

References

  1. Abohela, I., Hamza, N. and Dudek, S. (2013), "Effect of roof shape, wind direction, building height and urban configuration on the energy yield and positioning of roof mounted wind turbines", Renew. Energy. 50, 1106-1118. https://doi.org/10.1016/j.renene.2012.08.068.
  2. Baetke, F., Werner, H. and Wengle, H. (1990), "Numerical simulation of turbulent flow over surface-mounted obstacles with sharp edges and corners", J. Wind Eng. Ind. Aerod., 35(1-3), 129-147. https://doi.org/10.1016/0167-6105(90)90213-V.
  3. Beyers, J.H.M., Sundsbo, P.A. and Harms, T.M. (2004), "Numerical simulation of three-dimensional, transient snow drifting around a cube", J. Wind Eng. Ind. Aerod., 92(9) 725-747. https://doi.org/10.1016/j.jweia.2004.03.011.
  4. Blocken, B., Stathopoulos, T. and Carmeliet, J. (2007), "CFD simulation of the atmospheric boundary layer: wall function problems", Atmosp. Environ., 41(2), 238-252. https://doi.org/10.1016/j.atmosenv.2006.08.019.
  5. Browne, M.T.L., Gibbons, M.P.M., Gamble, S. and Galsworthy, J. (2013), "Wind loading on tilted roof-top solar arrays: The parapet effect", J. Wind Eng. Ind. Aerod., 123 202-213. https://doi.org/10.1016/j.jweia.2013.08.013.
  6. Corke, T.C., Nagib, H.M. (1979), "Wind loads on a building model in a family of surface layers", J. Wind Eng. Ind. Aerod., 5, 159-177. https://doi.org/10.1016/0167-6105(79)90029-1.
  7. Cheng, Z., Lou, W., Sun, B. and Tang, J. (2000), "Wind load on roof structures and mechanism of wind-induced damages", J. Build. Struct., 21(04), 39-47.
  8. Gao, F., Wang, X. and Zhang, H. (2016), "A research on boundary layer control of asymmetric supersonic flow past micro-vortex generator", J. Air Force Eng. Univ. Nat. Sci. Edit., 17(6), 6-11.
  9. Gullbrekken, L., Uvslokk, S., Kvande, T., Pettersson, K. and Time, B. (2018), "Wind pressure coefficients for roof ventilation purposes", J. Wind Eng. Ind. Aerod., 175 144-152. https://doi.org/10.1016/j.jweia.2018.01.026.
  10. Holscher, N. and Niemann, H.J. (1998), "Towards quality assurance for wind tunnel tests: A comparative testing program of the Windtechnologische Gesellschaft", J. Wind Eng. Ind. Aerod., 74-76, 599-608. https://doi.org/10.1016/S0167-6105(98)00054-3.
  11. Lee, M., Lee, S.H., Hur, N. and Choi, C.K. (2010), "A numerical simulation of flow field in a wind farm on complex terrain", Wind Struct., 13(4), 375-383. https://doi.org/10.12989/was.2010.13.4.375
  12. Lin, J.C. (2002), "Review of research on low-profile vortex generators to control boundary-layer separation", Progress in Aerospace Sciences. 38(4), 389-420. https://doi.org/10.1016/S0376-0421(02)00010-6.
  13. Manolesos, M. and Voutsinas, S.G. (2015), "Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation", J. Wind Eng. Ind. Aerod., 142 130-148. https://doi.org/10.1016/j.jweia.2015.03.020.
  14. Moravej, M., Irwin, P., Zisis, I., Chowdhury, A.G. and Hajra, B. (2017), "Effects of roof height on local pressure and velocity coefficients on building roofs", Eng. Struct., 150 693-710. https://doi.org/10.1016/j.engstruct.2017.07.083.
  15. Richards, P.J., Hoxey, R.P. and Short, L.J. (2001), "Wind pressures on a 6 m cube", J. Wind Eng. Ind. Aerod., 89(14), 1553-1564. https://doi.org/10.1016/S0167-6105(01)00139-8
  16. Oliveira N.L.D. and Fernando M.D.S. (2018), "Simulation and measurements of wind interference on a solar chimney performance", J. Wind Eng. Ind. Aerod., 179, 135-145. https://doi.org/10.1016/j.jweia.2018.05.020.
  17. Rizzo, F. and Ricciardelli, F. (2017), "Design pressure coefficients for circular and elliptical plan structures with hyperbolic paraboloid roof", Eng. Struct., 139 153-169. https://doi.org/10.1016/j.engstruct.2017.02.035.
  18. Shan, W., Tamura, Y., Yang, Q. and Li, B. (2018), "Effects of curved slopes, high ridges and double eaves on wind pressures on traditional Chinese hip roofs", J. Wind Eng. Ind. Aerod., 183 68-87. https://doi.org/10.1016/j.jweia.2018.10.010.
  19. Stillfried, F.V., Wallin, S. and Johansson, A. (2010). "An improved passive vortex generator model for flow separation control", Flow Control Conference. https://doi.org/10.2514/6.2010-5091.
  20. Xin, D., Zhang, H. and Ou, J. (2018), "Experimental study on mitigating vortex-induced vibration of a bridge by using passive vortex generators", J. Wind Eng. Ind. Aerod., 175 100-110. https://doi.org/10.1016/j.jweia.2018.01.046.