Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2001.11b
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- Pages.570-577
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- 2001
Three-Dimensional Transition in the Wake of a Circular Cylinder By Direct Numerical Simulation
DNS에 의한 원주 후류에서의 3차원 천이
- Knag, S.J. ;
- Tanahashi, M. (Tokyo Institute of Technology Mechano-Aerospace Engineering) ;
- Miyauchi, T. (Tokyo Institute of Technology Mechano-Aerospace Engineering) ;
- Mo, J.O. ;
- Lee, Y.H.
- Published : 2001.11.01
Abstract
Three-dimensional time-dependent flow past a circular cylinder is numerically investigated using direct numerical simulation for Reynolds number 280 and 300. The higher-order finite difference scheme is employed for the spatial distributions along with the second order Adams-Bashforth and the first order backward-Euler time integration. In x-y plane, the convection term is applied by the 5th order upwind scheme and the pressure and viscosity terms are applied by the 4th order central difference. And in spanwise, Navier-Stokes equation is distributed using of Spectral Method. At Reynolds number 259 the two-dimensional wake becomes linearly unstable to a second branch of modes with wavelength about 1.0 diameters at onset (B-mode). Present results of three-dimensional effects of in wake of a circular cylinder is represented with spanwise and streamwise vorticity contours as Reynolds numbers.
Keywords