한국전산유체공학회지 (Journal of computational fluids engineering)

한국전산유체공학회 (Korean Society of Computational Fluids Engineering)
권호 표지

원형 실린더가 주기적으로 배열된 채널 유동의 주 유동 불안정성 - 실린더와 채널 벽 간격의 영향 -

PRIMARY INSTABILITY OF THE CHANNEL FLOW WITH A STREAMWISE-PERIODIC ARRAY OF CIRCULAR CYLINDERS - EFFECTS OF THE DISTANCE BETWEEN THE CYLINDER AND THE CHANNEL WALL -

  • 윤동혁 (한국원자력안전기술원) ;
  • 양경수 (인하대학교 기계공학부) ;
  • 강창우 (인하대학교 대학원 기계공학과)
  • 투고 : 2010.06.18
  • 심사 : 2010.09.10
  • 발행 : 2010.09.30
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초록

A parametric study has been carried out to elucidate the characteristics of channel flow with a streamwise-periodic array of cylinders. This flow configuration is relevant to heat exchanger applications. The presence of cylinders in channel flow causes the attached wall boundary layer to separate, leading to significant change in flow instabilities. There exist two kinds of instabilities; flow undergoes a primary instability (Hopf bifurcation) at a lower Reynolds number, and the unsteady two-dimensional flow becomes unstable to three-dimensional disturbances at a higher Reynolds number. We report here the dependencies of the primary instability as well as the flow characteristics of the subsequent unsteady flow, including flow-induced forces and Strouhal number of vortex shedding, on the distance between the cylinder and the channel wall.

키워드

참고문헌

  1. 2002, Valencia, A. and Cid, M., "Turbulent Unsteady Flow and Heat Transfer in Channels with Periodically Mounted Square Bars," Int. J. Heat and Mass Transfer, Vol.45, No.8, pp.1661-1673. https://doi.org/10.1016/S0017-9310(01)00267-8
  2. 1994, Suzuki, K. and Suzuki, H., "Unsteady Heat Transfer in a Channel Obstructed by an Immersed Body," Ann. Rev. Heat Transfer, Vol.5, pp.174-206.
  3. 1994, Yao, M., Nakatani, M., Okuda, M. and Suzuki, K., "Simultaneous Measurements of Flow and Thermal Fields in a Turbulent Channel Flow with Insertion of a Square Rod," Trans. Jpn. Soc. Mech. Eng., (in Japanese), Vol.60, No.580, B, pp.4192-4199. https://doi.org/10.1299/kikaib.60.4192
  4. 1996, Sano, M., "Fluid Flow and Heat Transfer in a Turbulent Channel Flow with Insertion of a Falt Body," Trans. Jpn. Soc. Mech. Eng., (in Japanese), Vol.62, No.604, B, pp.4197-4203. https://doi.org/10.1299/kikaib.62.4197
  5. 1994, Chung, I.K., Araki, N. and Nakayama, A., "Augmentation of Forced Convective Heat Transfer for Thermally Developing Region in Rectangular Channel by Means of Turbulence Promoter," Trans. Jpn. Soc. Mech. Eng., (in Japanese), Vol.60, No.574, B, pp.2149-2157. https://doi.org/10.1299/kikaib.60.2149
  6. 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, pp.132-150. https://doi.org/10.1006/jcph.2001.6778
  7. 2000, You, J., Choi, H. and Yoo, J.Y., "A modified fractional step method of keeping a constant mass flow rate in fully developed channel and pipe flows," KSME International Journal, Vol.14, pp.547-552.
  8. 1995, Schatz, M.F., Barkley, D. and Swinney, H.L., "Instability in a spatially periodic open flow," Phys. Fluids, Vol.7, pp.344-358. https://doi.org/10.1063/1.868632
  9. 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
  10. 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
  11. 1994, Park, D.S., "Theoretical analysis of feed back control of Karman vortex shedding at slightly supercritical Reynolds numbers," Eur. J. Mech. B/Fluids, Vol.13, pp.387-399.
  12. 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