대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)
- 제20권9호
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- Pages.2965-2972
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- 1996
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
천이박리유동의 직접수치모사 Part I:주 불안정성
Drirect Numerical Simulation of Transitional Separated Flows Part I:Primary Instability
초록
Transitional flow in an obstructed channel is investigated using numerical simulation. Two-dimensional thin obstacles are mounted symmetrically in the vertical direction and periodically in the streamwise direction. Flow separation occurs at the tip of the sharp obstacles. Depending on the Reynolds number, the flow undergoes Hopf bifurcation as the primary instability leading to a two-dimensional unsteady periodic solution. At higher Reynolds numbers, the unsteady solution exhibits a symmetry-breaking bifurcation which results in an unsteady asymmetric solution. The results are compared with experiments currently available, and show a good agreement.
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