Wind and Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Numerical studies of unsteady flow field and aerodynamic forces on an oscillating 5:1 rectangular cylinder in a sinusoidal streamwise flow

  • Ma, Ruwei (Research Center for Wind Engineering, Southwest Jiaotong University) ;
  • Zhou, Qiang (Research Center for Wind Engineering, Southwest Jiaotong University) ;
  • Wang, Peiyuan (Research Center for Wind Engineering, Southwest Jiaotong University) ;
  • Yang, Yang (Research Center for Wind Engineering, Southwest Jiaotong University) ;
  • Li, Mingshui (Research Center for Wind Engineering, Southwest Jiaotong University)
  • Received : 2019.07.26
  • Accepted : 2020.08.05
  • Published : 2022.01.25
⟨ Previous Next ⟩

Abstract

Numerical simulations are conducted to investigate the uniform flow (UF) and sinusoidal streamwise flow (SSF) over an oscillating 5:1 rectangular cylinder with harmonic heaving motion at initial angles of attack of α = 0° and 3° using two-dimensional, unsteady Reynolds-averaged Navier-Stokes (URANS) equations. First, the aerodynamic parameters of a stationary 5:1 rectangular cylinder in UF are compared with the previous experimental and numerical data to validate the capability of the computationally efficient two-dimensional URANS simulations. Then, the unsteady flow field and aerodynamic forces of the oscillating 5:1 rectangular cylinder in SSF are analysed and compared with those in UF to explore the effect of SSF on the rectangular cylinder. Results show that the alternative vortex shedding is disturbed by SSF both at α = 0° and 3°, resulting in a considerable decrease in the vortex-induced force, whereas the unsteady lift component induced by cylinder motion remains almost unchanged in the SSF comparing with that in UF. Notably, the strong buffeting forces are observed at α = 3° and the energy associated with unsteady lift is primarily because of the oscillations of SSF. In addition, the components of unsteady lift induced by the coupling effects of SSF and cylinder motion are discussed in detail.

Keywords

Acknowledgement

The work was supported by the National Natural Science Foundation of China (Grant No. 52078437, 52008357, 51878580) and Sichuan Science and Technology Plan (No. 2021YJ0075).

References

  1. Bartoli, G., Borsani, A., Mannini, C., Marra, A. M., Procino, L. and Ricciardelli, F. (2011), "Wind tunnel study on the aerodynamics of a 5: 1 rectangular cylinder in smooth flow", In Proceedings of the Thirteenth International Conference on Wind Engineering, Amsterdam, The Netherlands.
  2. Bartoli, G. (2008), BARC Overview Document, http://www.aniviawe.org/barc.
  3. Bearman, P.W. and Trueman, D.M. (1972), "An investigation of the flow around rectangular cylinders", Aeronaut. Quart., 23(3), 229-237. https://doi.org/10.1017/S0001925900006119.
  4. Bruno, L., Fransos, D., Coste, N. and Bosco, A. (2010), "3D flow around a rectangular cylinder: a computational study", J. Wind Eng. Ind. Aerod., 98(6-7), 263-276. https://doi.org/10.1016/j.jweia.2009.10.005.
  5. Bruno, L., Salvetti, M.V. and Ricciardelli, F. (2014), "Benchmark on the aerodynamics of a rectangular 5: 1 cylinder: an overview after the first four years of activity", J. Wind Eng. Ind. Aerod., 126, 87-106. https://doi.org/10.1016/j.jweia.2014.01.005.
  6. Cao, S. and Li, M. (2015), "Numerical study of flow over a circular cylinder in oscillatory flows with zero-mean and nonzero- mean velocities", J. Wind Eng. Ind. Aerod., 144, 42-52. https://doi.org/10.1016/j.jweia.2015.04.007.
  7. Cao, S., Zhou, Q. and Zhou, Z. (2014), "Velocity shear flow over rectangular cylinders with different side ratios", Comput. Fluids, 96, 35-46. https://doi.org/10.1016/j.compfluid.2014.03.002.
  8. Li, M., Li, Q. and Shi, H. (2021), "Aerodynamic pressures on a 5:1 rectangular cylinder in sinusoidal streamwise oscillatory flows with non-zero mean velocities", J. Wind Eng. Ind. Aerod., 208, 104440. https://doi.org/10.1016/j.jweia.2020.104440.
  9. Li, Q.S. and Melbourne, W.H. (1995), "An experimental investigation of the effects of free-stream turbulence on streamwise surface pressures in separated and reattaching flows", J. Wind Eng. Ind. Aerod., 54, 313-323. https://doi.org/10.1016/0167-6105(94)00050-N.
  10. Li, Q.S. and Melbourne, W.H. (1999), "The effect of large-scale turbulence on pressure fluctuations in separated and reattaching flows", J. Wind Eng. Ind. Aerod., 83(1-3), 159-169. https://doi.org/10.1016/S0167-6105(99)00069-0
  11. Lin, S., Wang, Q., Nikitas, N. and Liao, H. (2019), "Effects of oscillation amplitude on motion-induced forces for 5:1 rectangular cylinders", J. Wind Eng. Ind. Aerod., 186, 68-83. https://doi.org/10.1016/j.jweia.2019.01.002.
  12. Ma, R., Yang, Y., Li, M. and Li, Q. (2021), "The unsteady lift of an oscillating airfoil encountering a sinusoidal streamwise gust", J. Fluid Mec., 908. https://doi.org/10.1017/jfm.2020.873.
  13. Ma, R., Zhou, Q., Wang, P., Yang, Y., Li, M. and Cao, S. (2021), "Effects of sinusoidal streamwise gust on the vortex-induced force on an oscillating 5:1 rectangular cylinder", J. Wind Eng. Ind. Aerod., 213, 104642. https://doi.org/10.1016/j.jweia.2021.104642.
  14. Mannini, C., Marra, A.M., Pigolotti, L. and Bartoli, G. (2017), "The effects of free-stream turbulence and angle of attack on the aerodynamics of a cylinder with rectangular 5: 1 cross section", J. Wind Eng. Ind. Aerod., 161, 42-58. https://doi.org/10.1016/j.jweia.2016.12.001.
  15. Mannini, C., Soda, A. and Schewe, G. (2011), "Numerical investigation on the three-dimensional unsteady flow past a 5: 1 rectangular cylinder", J. Wind Eng. Ind. Aerod., 99(4), 469-482. https://doi.org/10.1016/j.jweia.2010.12.016.
  16. Mannini, C., Soda, A. and Schewe, G. (2010), "Unsteady RANS modelling of flow past a rectangular cylinder: Investigation of Reynolds number effects", Comput. Fluids, 39(9), 1609-1624. https://doi.org/10.1016/j.compfluid.2010.05.014.
  17. Matsumoto, M., Shirato, H., Araki, K., Haramura, T. and Hashimoto, T. (2003), "Spanwise coherence characteristics of surface pressure field on 2-D bluff bodies", J. Wind Eng. Ind. Aerod., 91(1-2), 155-163. https://doi.org/10.1016/S0167-6105(02)00342-2.
  18. Nakamura, Y. and Ohya, Y. (1984), "The effects of turbulence on the mean flow past two-dimensional rectangular cylinders", J. Fluid Mech., 149, 255-273. https://doi.org/10.1017/S0022112084002640.
  19. Nakamura, Y. and Ozono, S. (1987), "The effects of turbulence on a separated and reattaching flow", J. Fluid Mech., 178, 477-490. https://doi.org/10.1017/S0022112087001320.
  20. Okajima, A. (2006), "Strouhal numbers of rectangular cylinders", Journal of Fluid Mechanics. 123. 379-398. https://doi.org/10.1017/S0022112082003115.
  21. Ong, M.C. (2012), "Unsteady rans simulation of flow around a 5: 1 rectangular cylinder at high reynolds numbers", In International Conference on Offshore Mechanics and Arctic Engineering, American Society of Mechanical Engineers.
  22. Patruno, L., Ricci, M., De Miranda, S. and Ubertini, F. (2016), "Numerical simulation of a 5: 1 rectangular cylinder at non-null angles of attack", J. Wind Eng. Ind. Aerod., 151, 146-157. https://doi.org/10.1016/j.jweia.2016.01.008.
  23. Perot, J.B. (1993), "An analysis of the fractional step method", J. Comput. Phys., 108(1), 51-58. https://doi.org/10.1006/jcph.1993.1162.
  24. Ribeiro, A.F. (2011), "Unsteady RANS modelling of flow past a rectangular 5:1 cylinder: investigation of edge sharpness effects", Proceedings of the 13th International Conference on Wind Engineering, Amsterdam, The Netherlands.
  25. Ricci, M., Patruno, L., De Miranda, S. and Ubertini, F. (2017), "Flow field around a 5: 1 rectangular cylinder using LES: Influence of inflow turbulence conditions, spanwise domain size and their interaction", Comput. Fluids, 149, 181-193. https://doi.org/10.1016/j.compfluid.2017.03.010
  26. Schewe, G. (2013), "Reynolds-number-effects in flow around a rectangular cylinder with aspect ratio 1:5", J. Fluids Struct., 39, 15-26. https://doi.org/10.1016/j.jfluidstructs.2013.02.013.
  27. Shimada, K. and Ishihara, T. (2002), "Application of a modified k-ε model to the prediction of aerodynamic characteristics of rectangular cross-section cylinders", J. Fluids Struct., 16(4), 465-485. https://doi.org/10.1006/jfls.2001.0433.
  28. Shirato, H., Yuichi, S. and Sasaki, O. (2011), "Surface pressure correlation and buffeting force evaluation", In Proceedings of the Thirteenth International Conference on Wind Engineering, Amsterdam, The Netherlands.
  29. Sohankar, A. (2008), "Large eddy simulation of flow past rectangular-section cylinders: Side ratio effects", J. Wind Eng. Ind. Aerod., 96(5), 640-655. https://doi.org/10.1016/j.jweia.2008.02.009.
  30. Wei, Z. and Kareem, A. (2011), "A benchmark study of flow around a rectangular cylinder with aspect ratio 1:5 at Reynolds number 1. E5", In Proceedings of the 13th International Conference on Wind Engineering, Amsterdam, July.
  31. Williamson, C.H. (1996), "Vortex dynamics in the cylinder wake", Ann. Rev. Fluid Mech., 28(1), 477-539. https://doi.org/10.1146/annurev.fl.28.010196.002401.
  32. Wu, B., Li, S., Cao, S., Yang, Q. and Zhang, L. (2020), "Numerical investigation of the separated and reattaching flow over a 5:1 rectangular cylinder in streamwise sinusoidal flow", J. Wind Eng. Ind. Aerod., 198, 104120. https://doi.org/10.1016/j.jweia.2020.104120.
  33. Wu, B., Li, S., Zhang, L. and Li, K. (2021), "Experimental determination of the two-dimensional aerodynamic admittances of a 5:1 rectangular cylinder in streamwise sinusoidal flows", J. Wind Eng. Ind. Aerod., 210, 104525. https://doi.org/10.1016/j.jweia.2021.104525.
  34. Zhou, Q., Cao, S. and Zhou, Z. (2013), "Numerical studies on non-shear and shear flows past a 5:1 rectangular cylinder", Wind Struct., 17(4), 379-397. http://dx.doi.org/10.12989/was.2013.17.4.379.