Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)
- Volume 20 Issue 9
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- Pages.2973-2980
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- 1996
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
Drirect Numerical Simulation of Transitional Separated Flows Part II:Secondary Instability
천이박리유동의 직접수치모사 Part II:이차적 불안정성
- Yang, Gyeong-Su (Dept.of Mechanical Engineering, Inha University)
- 양경수 (인하대학교 기계공학과)
- Published : 1996.09.01
Abstract
Secondary instability in an obstructed channel is investigated using direct numerical simulation. Flow geometry under consideration is a plane channel with two-dimensional thin obstacles mounted symmetrically in the vertical direction and periodically in the streamwise direction. Flow separation occurs at the tip of the sharp obstacles. As a basic flow, we consider an unsteady periodic solution which results from Hopf bifurcation. Depending on the Reynolds number, the basic flow becomes unstable to three-dimensional disturbances, which results in a chaotic flow. Numerical results obtained are consistent with experimental findings currently available.
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