한국전산유체공학회지 (Journal of computational fluids engineering)

한국전산유체공학회 (Korean Society of Computational Fluids Engineering)
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배플이 부착된 채널 유동의 불안정성

FLOW INSTABILITY IN A BAFFLED CHANNEL FLOW

  • 강창우 (인하대학교 대학원 기계공학과) ;
  • 양경수 (인하대학교 기계공학부)
  • 투고 : 2010.07.26
  • 심사 : 2011.03.04
  • 발행 : 2011.03.31
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초록

Flow instability is investigated in a two-dimensional channel with thin baffles placed symmetrically in the vertical direction and periodically in the streamwise dircetion. At low Reynolds numbers, the flow is steady and symmetric. Above a critical Reynolds number, the steady flow undergoes a Hopf bifurcation leading to unsteady periodic flow. As Reynolds number further increases, we observe the onset of secondary instability. At high Reynolds numbers, the two-dimensional periodic flow becomes three dimmensional. To identify the onset of secondary instability, we carry out Floquet stability analysis. We obseved the transition to 3D flow at a Reynolds number of about 125. Also, we computed dominant spanwise wavenumbers near the critical Reynolds number, and visualized vortical structures associated with the most unstable spanwise wave.

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참고문헌

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