Wind and Structures

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Flow control downstream of a circular cylinder by a permeable cylinder in deep water

  • Gozmen, Bengi (Department of Mechanical Engineering, Usak University) ;
  • Akilli, Huseyin (Department of Mechanical Engineering, Cukurova University)
  • Received : 2013.08.20
  • Accepted : 2014.07.20
  • Published : 2014.10.25
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Abstract

The flow characteristics of a circular cylinder surrounded by an outer permeable cylinder were experimentally investigated using Particle Image Velocimetry Technique in deep water flow. In order to consider the effects of diameter and porosity of the outer cylinder on flow structures of the inner cylinder, five different outer cylinder diameters (D=37.5, 52.5, 60, 75 and 90 mm) and eight different porosities (${\beta}$=0.4, 0.5, 0.6, 0.65, 0.7, 0.75, 0.8 and 0.85) were selected. During the experiments, the diameter of inner cylinder was kept constant as d=30 mm. The depth-averaged free-stream velocity was adjusted as U=0.156 m/s, which corresponds to the Reynolds number of Re=5000 based on the inner cylinder diameter. It has been concluded that both the outer permeable cylinder diameter and the porosity have important influences on the attenuation of vortex shedding in the wake region. The presence of outer permeable cylinder decreases the magnitude of Reynolds shear stress and turbulent kinetic energy compared to the bare cylinder case. Moreover, the spectral analysis of vortex shedding frequency has revealed that the dominant frequency of vortex shedding downstream of the cylinder arrangement also reduces substantially due to the weakened Karman shear layer instability.

Keywords

References

  1. Akilli, H., Sahin, B. and Tumen, N.F. (2005), "Suppression of vortex shedding of circular cylinder in shallow water by a splitter plate", Flow Meas. Instrum., 16(4), 211-219. https://doi.org/10.1016/j.flowmeasinst.2005.04.004
  2. Akilli, H., Karakus, C., Akar, A., Sahin, B. and Tumen, N.F. (2008), "Control of vortex shedding of circular cylinder in shallow water flow using an attached splitter plate", J. Fluid Eng.-T ASME, 130(4), 1-11.
  3. Akansu, Y.E. and Firat, E. (2010), "Control of flow around a square prism by slot jet injection from the rear surface", Exp. Therm. Fluid Sci., 34(7), 906-914. https://doi.org/10.1016/j.expthermflusci.2010.02.007
  4. Bhattacharyya, S., Dhinakaran, S. and Khalili, A. (2006), "Fluid motion around and through a porous cylinder", Chem. Eng. Sci., 61(13), 4451-4461. https://doi.org/10.1016/j.ces.2006.02.012
  5. Bruneau, C.H. and Mortazavi, I. (2006), "Control of vortex shedding around a pipe section using a porous sheath", Int. J. Offshore Polar., 16(2), 1-7.
  6. Bhattacharyya, S. and Singh, A.K. (2011), "Reduction in drag and vortex shedding frequency through porous sheath around a circular cylinder", Int J. Numer. Meth. Fl., 65(6), 683-698. https://doi.org/10.1002/fld.2210
  7. Cattafesta, L.N., Garg, S. and Shukla, D. (2001), "Development of piezoelectric actuators for active flow control", AIAA J., 39(8), 1562-1568. https://doi.org/10.2514/2.1481
  8. Choi, H., Jean, W.P. and Kim, J. (2008), "Control of flow over a bluff body", Annu. Rev. Fluid Mech., 40, 113-139. https://doi.org/10.1146/annurev.fluid.39.050905.110149
  9. Dol1, S.S., Kopp, G.A. and Martinuzzi, R.J. (2008), "The suppression of periodic vortex shedding from a rotating circular cylinder", J. Wind Eng. Ind. Aerod., 96(6-7), 1164-1184. https://doi.org/10.1016/j.jweia.2007.06.038
  10. Ekmekci, A. and Rockwell, D. (2010), "Effects of a geometrical surface disturbance on flow past a circular cylinder: a large-scale spanwise wire", J. Fluid Mech., 665, 120-157. https://doi.org/10.1017/S0022112010003848
  11. Feng, L.H. and Wang, J.J. (2010), "Circular cylinder vortex-synchronization control with a synthetic jet positioned at the rear stagnation point", J. Fluid Mech., 662, 232-259. https://doi.org/10.1017/S0022112010003174
  12. Fransson, J.H.M., Konieczny, P. and Alfredsson, P.H. (2004), "Flow around a porous cylinder subject to continuous suction or blowing", J. Fluid Struct., 19(8), 1031-1048. https://doi.org/10.1016/j.jfluidstructs.2004.06.005
  13. Gad El Hak, M. (2007), Flow control: passive, active and reactive flow, Cambridge University Press, Cambridge, England.
  14. Gerrard, JH. (1966), "The mechanics of the formation region of vortices behind bluff bodies", J. Fluid Mech., 25, 401-413. https://doi.org/10.1017/S0022112066001721
  15. Gozmen, B., Akilli, H. and Sahin, B. (2013), "Passive control of circular cylinder wake in shallow flow", Measurement, 46(3), 1125-1136. https://doi.org/10.1016/j.measurement.2012.11.008
  16. Kleissl, K. and Georgakis, C.T. (2011), "Aerodynamic control of bridge cables through shape modification: A preliminary study", J. Fluid Struct., 27(7), 1006-1020. https://doi.org/10.1016/j.jfluidstructs.2011.04.012
  17. Kuo, C.H. and Chen, C.C. (2009), "Passive control of wake flow by two small control cylinders at Reynolds number 80", J. Fluid Struct., 25(6), 1021-1028. https://doi.org/10.1016/j.jfluidstructs.2009.05.007
  18. Lee, S.J., Lee, S.I. and Park, C.W. (2004), "Reducing the drag on a circular cylinder by upstream installation of a small control rod", Fluid Dyn. Res., 34(4), 233-250. https://doi.org/10.1016/j.fluiddyn.2004.01.001
  19. Lee, S.J. and Lee, J.Y. (2008), "Piv measurements of the wake behind a rotationally oscillating circular cylinder", J. Fluid Struct., 24(1), 2-17. https://doi.org/10.1016/j.jfluidstructs.2007.06.001
  20. Lee, T. and Ko, L.S. (2009), "PIV investigation of flowfield behind perforated Gurney-type flaps", Exp. Fluids, 46(6), 1005-1019. https://doi.org/10.1007/s00348-008-0606-1
  21. Li, Z., Navon, I.M., Hussaini, M.Y. and Le Dimet, F.X. (2003), "Optimal control of cylinder wakes via suction and blowing", Comput. Fluids, 32(2), 149-171. https://doi.org/10.1016/S0045-7930(02)00007-5
  22. Lim, H.C. and Lee, S.J. (2004), "Flow control of a circular cylinder with O-rings", Fluid Dyn. Res., 35(2), 107-122. https://doi.org/10.1016/j.fluiddyn.2004.05.001
  23. Min, C. and Choi, H. (1999), "Suboptimal feedback control of vortex shedding at low Reynolds number", J. Fluid Mech., 401, 123-156. https://doi.org/10.1017/S002211209900659X
  24. Nakamura, Y. (1996), "Vortex shedding from bluff bodies with splitter plates", J. Fluid Struct., 10(2), 147-158. https://doi.org/10.1006/jfls.1996.0010
  25. Nakamura, H. and Igarshi, T. (2008), "Omnidirectional reductions in drag and fluctuating forces for a circular cylinder by attaching rings", J. Wind Eng. Ind. Aerod., 96(6-7), 887-899. https://doi.org/10.1016/j.jweia.2007.06.016
  26. Ozgoren, M., Pinar, E., Sahin, B. and Akilli, H. (2011), "Comparison of flow structures in the downstream region of a cylinder and sphere", Int. J. Heat Fluid Fl., 32(6), 1138-1146. https://doi.org/10.1016/j.ijheatfluidflow.2011.08.003
  27. Ozkan, G.M., Oruc, V., Akilli, H. and Sahin, B. (2012), "Flow around a cylinder surrounded by a permeable cylinder in shallow water", Exp. Fluids, 53(6), 1751-1763. https://doi.org/10.1007/s00348-012-1393-2
  28. Pinar, E., Ozkan, G.M., Akilli, H. and Sahin, B. (2011), "Flow control downstream of a circular cylinder via a surrounding perforated cylinder", Proceeding of the 6th Ankara International Aerospace Conference METU, Ankara, TURKEY, September.
  29. Raffel, M., Willert, C.E. and Kompenhans, J. (1998), Particle image velocimetry a practical guide, Springer, Gottingen.
  30. Sobera, M.P., Kleijn, C.R. and Van den Akker, H.E.A. (2006), "Subcritical flow past a circular cylinder surrounded by a porous layer", Phys. Fluids, 18(3), 038106. https://doi.org/10.1063/1.2189284
  31. Thompson, M., Hourigan, K. and Sheridan, J. (1996), "Three-dimensional Instabilities in the wake of a circular cylinder", Exp. Therm. Fluid Sci., 12(2), 190-196. https://doi.org/10.1016/0894-1777(95)00098-4
  32. Unal, M.F. and Rockwell, D. (1988), "On vortex formation from a cylinder. Part 1: control by splitter-plate interference", J. Fluid Mech., 190, 513-529. https://doi.org/10.1017/S0022112088001430
  33. Wang, J.J., Zhang, P.F., Lu, S.F. and Wu, K. (2006), "Drag reduction of a circular cylinder using an upstream rod", Flow Turbul. Combust., 76(1), 83-101. https://doi.org/10.1007/s10494-005-9008-0
  34. Willimson, C.H.K. (1996), "Vortex dynamics in the cylinder wake", Annu. Rev. Fluid. Mech., 28, 477-539. https://doi.org/10.1146/annurev.fl.28.010196.002401
  35. Yucel, S.B., Cetiner, O. and Unal, M.F. (2010), "Interaction of circular cylinder wake with a short asymmetrically located downstream plate", Exp Fluids, 49(1), 241-255. https://doi.org/10.1007/s00348-010-0852-x

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