Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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FLOW PAST A RECTANGULAR CYLINDER

사각 실린더를 지나는 층류 유동특성

  • Received : 2015.06.17
  • Accepted : 2015.08.31
  • Published : 2015.09.30
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Abstract

This study performed numerical simulation to elucidate the characteristics of flow past a rectangular cylinder with various values of the aspect ratio(AR) of the cylinder. We calculated the flow field, force coefficients and Strouhal number of vortex shedding depending on the Reynolds number(Re) and the aspect ratio. The $AR{\approx}1$ is preferred for drag reduction, and 0.375$AR{\approx}0$ is recommended if suppression of the lift-coefficient fluctuation and the shedding frequency is desirable. Furthermore the criticality of the Hopf bifurcation is also reported for each AR.

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References

  1. 1982, Okajima, A., "Strouhal numbers of rectangular cylinders," J. Fluid Mech., Vol.123, pp.379-398. https://doi.org/10.1017/S0022112082003115
  2. 1998, Sohankar, A., Norberg, C. and Davidson, L., "Low-Reynolds number flow around a square cylinder at incidence: study of blockage, onset of vortex shedding and outlet boundary condition," Int. J. Numer. Meth. Fluids, Vol.26, No.1, pp.39-56. https://doi.org/10.1002/(SICI)1097-0363(19980115)26:1<39::AID-FLD623>3.0.CO;2-P
  3. 2004, Sharma, A. and Eswaran, V., "Heat and fluid flow across a square cylinder in the two-dimensional laminar flow regime," Numer. Heat Transfer, Part A, Vol.45, No.3, pp.247-269. https://doi.org/10.1080/10407780490278562
  4. 2004, Kim, D.-H., Yang, K.-S. and Senda, M., "Large eddy simulation of turbulent flow past a square cylinder confined in a channel," Comput. Fluids, Vol.33, No.1, pp.81-96. https://doi.org/10.1016/S0045-7930(03)00040-9
  5. 1971, Stuart, J.T., "Nonlinear stability theory," Ann. Rev. Fluid Mech., Vol.3, pp.347-370. https://doi.org/10.1146/annurev.fl.03.010171.002023
  6. 1994, Schumm, M., Berger, E. and Monkewitz, P.A., "Self-excited oscillations in the wake of two-dimensional bluff bodies and their control," J. Fluid Mech., Vol.271, pp.17-53. https://doi.org/10.1017/S0022112094001679
  7. 1994, Park, D.S., "Theoretical analysis of feedback control of Karman vortex shedding at slightly supercritical Reynolds numbers," Eur. J. Mech. B/Fluids, Vol.13, No.4, pp.387-399.
  8. 1995a, Najjar, F.M. and Vanka, S.P., "Simulations of the unsteady separated flow past a normal flat plate," Int. J. Numer. Methods Fluids, Vol.21, No.7, pp.525-547. https://doi.org/10.1002/fld.1650210702
  9. 1995b, Najjar, F.M. and Vanka, S.P., "Effects of intrinsic three-dimensionality on the drag characteristics of a normal flat plate," Phys. Fluids, Vol.7, No.10, pp.2516-2518. https://doi.org/10.1063/1.868698
  10. 1998, Najjar, F.M. and Balachandar, S., "Low-frequency unsteadiness in the wake of a normal flat plate," J. Fluid Mech., Vol.370, pp.101-147. https://doi.org/10.1017/S0022112098002110
  11. 2007, Saha, A.K., "Far-wake characteristics of twodimensional flow past a normal flat plate," Phys. Fluids, Vol.19, No.12, pp.128110. https://doi.org/10.1063/1.2825413
  12. 2013, Saha, A.K., "Direct numerical simulation of twodimensional flow past a normal flat plate," J. Eng. Mech., Vol.139, No.12, pp.1894-1901. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000624
  13. 2014, Choi, C.B. and Yang, K.-S., "Three-dimensional instability in flow past a rectangular cylinder ranging from a normal flat plate to a square cylinder," Phys. Fluids, Vol.26, No.6, pp.061702. https://doi.org/10.1063/1.4883176
  14. 1987, Perry, A.E. and Steiner, T.R., "Large-scale vortex structures in turbulent wakes behind bluff bodies. Part 1. Vortex formation process," J. Fluid Mech., Vol.174, pp.233-270. https://doi.org/10.1017/S0022112087000119
  15. 1988, Kiya, M. and Matsumura, M., "Incoherent turbulence structure in the near wake of a normal plate," J. Fluid Mech., Vol.190, pp.343-356. https://doi.org/10.1017/S002211208800134X
  16. 2001, Kim, J., Kim, D. and Choi, H., "An Immersed -Boundary Finite-Volume Method for simulations of flow in complex geometries," J. Comput. Phys., Vol.171, No.1, pp.132-150. https://doi.org/10.1006/jcph.2001.6778
  17. 1985, Kim, J. and Moin, P., "Application of a fractional step method to incompressible Navier-Stokes equations," J. Comput. Phys., Vol.59, No.2, pp.308-323. https://doi.org/10.1016/0021-9991(85)90148-2
  18. 2006, De, A.K. and Dalal, A., "Numerical simulation of unconfined flow past a triangular cylinder," Int. J. Numer. Methods Fluids, Vol.52, No.7, pp.801-821. https://doi.org/10.1002/fld.1210
  19. 2008, Lankadasu, A. and Vengadesan, S., "Onset of vortex shedding in planar shear flow past a square cylinder," Int. J. Heat Fluid Flow, Vol.29, No.4, pp.1054-1059. https://doi.org/10.1016/j.ijheatfluidflow.2008.02.016
  20. 2014, Thompson, M.C., Radi, A., Rao, A., Sheridan, J. and Hourigan, K., "Low-Reynolds-number wakes of elliptical cylinders: from the circular cylinder to the normal flat plate," J. Fluid Mech., Vol.751, pp.570-600. https://doi.org/10.1017/jfm.2014.314
  21. 2006, Thompson, M.C., Hourigan, K., Ryan, K. and Sheard, G.J., "Wake transition of two-dimensional cylinders and axisymmetric bluff bodies," J. Fluids Struct., Vol.22, No.6-7, pp.793-806. https://doi.org/10.1016/j.jfluidstructs.2006.05.001