Three dimensional numerical computations of flows around stationary and oscillating cylinders
- Kanazawa Univ., Ishikawa (Japan). Dept. of Mechanical Systems Engineering
While the previous two-dimensional computations captured large parts of features of the flow around a bluff body, three dimensional simulations are expected to have a better accuracy approaching to experiments, especially at high Reynolds numbers where the discrepancy between computed values and measured data comes to the fore. In the present paper, flows around a stationary and oscillating bluff body have been three-dimensionally simulated through Direct Simulation (hereafter DS) and Large Eddy Simulation (hereafter LES) methods. The DS method is used at low Reynolds numbers of 600 and 10{sup 3}, while the LES method based on Smagorinsky model is employed at Reynolds numbers of 2.2 {times} 10{sup 4} and 7.14 {times} 10{sup 4}. The algorithms are SIMPLE and HSMAC respectively for the DS and LES methods. The forced oscillation is normal to uniform flow at amplitude of 14% of the cylinder`s section length for the DS method and 10% for the LES method. The three-dimensional features of flows are evident especially on streak-lines and span-wise coherence of vorticity distribution. The numerically simulated results of lift and drag, frequency of vortex shedding, flow pattern, and phase angle difference between the lift and cylinder displacement are in a good agreement with those obtained by experiments. The lock-in phenomenon of vortex shedding frequency synchronizing with the forced oscillation frequency of cylinder is also successfully simulated.
- OSTI ID:
- 129214
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1342-8
- Country of Publication:
- United States
- Language:
- English
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