Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
권호 표지

FLOW-INDUCED FORCES ON AN INCLINED SQUARE CYLINDER

기울어진 정방형 실린더에 작용하는 유체력

  • 윤동혁 (인하대학교 대학원 기계공학과) ;
  • 양경수 (인하대학교 기계공학부) ;
  • 최춘범 (인하대학교 대학원 기계공학과)
  • Published : 2009.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Numerical investigation has been carried out for laminar flow past an inclined square cylinder in cross freestream. In particular, inclination of a square cylinder with respect to the main flow direction can cause sudden shift of the separation points to other edges, resulting in drastic change of flow-induced forces on the cylinder such as Strouhal number (St) of vortex shedding, drag and lift forces on the cylinder, depending upon the inclination angle. Collecting all the numerical results obtained, we propose contour diagrams of drag/lift coefficients and Strouhal number on an Re-Angle plane. This study would be the first step towards understanding flow-induced forces on cylindrical structures under a strong gust of wind from the viewpoint of wind hazards.

Keywords

References

  1. 2005, Sarioglu, M., Akansu, Y.E. and Yavuz, T., "Control of flow around square cylinders at incidence by using a rod," AIAA Journal, Vol.43, No.7, pp.1419-1426 https://doi.org/10.2514/1.9460
  2. 2003, Hwang, J.-Y., Yang, K.-S. and Sun, S.-H., "Reduction of flow-induced forces on a circular cylinder using a detached splitter plate," Physics of Fluids, Vol.15, No.8, pp.2433-2436 https://doi.org/10.1063/1.1583733
  3. 1984, Igarashi, T., "Characteristics of the flow around a square prism," Bull. JSME, Vol.27, pp.1858-1865 https://doi.org/10.1299/jsme1958.27.1858
  4. 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, pp.39-56 https://doi.org/10.1002/(SICI)1097-0363(19980115)26:1<39::AID-FLD623>3.0.CO;2-P
  5. 1994, Zaki, T.G., Sen, M. and Gad-el-Hak, M., "Numerical and experimental investigation of flow past a freely rotatable square cylinder," Journal of Fluids and Structures, Vol.8, pp.555-582 https://doi.org/10.1016/S0889-9746(94)90020-5
  6. 1999, Robichaux, J., Balachandar, S. and Vanka, S.P., "Three-dimensional Floquet instability of the wake of square cylinder," Physics of Fluids, Vol.11, No.3, pp.560-578 https://doi.org/10.1063/1.869930
  7. 1995, Lyn, D.A., Einav, S., Rodi, W. and Park, J.-H., "A laser-Doppler volocimetry study of ensemble-averaged characteristics of the turbulent near wake of a square cylinder," J. Fluid Mech., Vol.304, pp.285-319 https://doi.org/10.1017/S0022112095004435
  8. 1997, Okajima, A., Yi, D., Sakuda, A. and Nakano, T., "Numerical study of blockage effects on aerodynamic characteristics of an oscillating rectangular cylinder," J. Wind Eng. Ind. Aerodyn., Vol.67,68, pp.91-102 https://doi.org/10.1016/S0167-6105(97)00065-2
  9. 2004, Sharma, A. and Eswaran, V., "Heat and fluid flow across a square cylinder in the two-dimensional laminar flow regime," Numerical Heat Transfer Part A, Vol.45, pp.247-269 https://doi.org/10.1080/10407780490278562
  10. 1985, Igarashi, T., "Heat transfer from a square prism to an air stream," Int. J. Heat Mass Transfer, Vol.28, pp.175-181 https://doi.org/10.1016/0017-9310(85)90019-5
  11. 1999, Chen, J.M., and Liu, C.-H., "Vortex shedding and surface pressures on a square cylinder at incidence to a uniform air stream," Int. J. Heat and Fluid Flow, Vol.20, pp.592-597 https://doi.org/10.1016/S0142-727X(99)00047-8
  12. 1993, Norberg, C., "Flow around rectangular cylinders: Pressure forces and wake frequencies," J. Wind Eng. Ind. Aero., Vol.49, pp.187-196 https://doi.org/10.1016/0167-6105(93)90014-F
  13. 2009, 윤동혁, 양경수, 최춘범, “기울어진 정방형 실린더 를 지나는 유동패턴의 수치해석적 연구,” 한국전산유체 공학회지, Vol.14, pp.19-24
  14. 2001, Kim, J., Kim, D. and Choi, H., "An immersed-Boundary Finite-Volume Method for Simulations of flow in Complex Geometries," J. Comp. Phys., Vol.171,pp.132-150 https://doi.org/10.1006/jcph.2001.6778
  15. 2006, De, A.K. and Dalal, A., "Numerical sumulation of unconfined flow past a triangular cylinder," Int. J. Numer. Meth. Fluids, Vol.52, pp.801-821 https://doi.org/10.1002/fld.1210
  16. 1996, Williamson, C.H.K., "Vortex dynamics in the cylinder wake," ,Annu. Rev. Fluid. Mech., Vol.28, pp.477-539 https://doi.org/10.1146/annurev.fl.28.010196.002401