대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)
- 제20권9호
- /
- Pages.2973-2980
- /
- 1996
- /
- 1226-4881(pISSN)
- /
- 2288-5324(eISSN)
DOI QR Code
천이박리유동의 직접수치모사 Part II:이차적 불안정성
Drirect Numerical Simulation of Transitional Separated Flows Part II:Secondary Instability
초록
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.
키워드