Direct numerical simulationsthe three-dimensional flow around an oscillating circular cylinder are carried out. Imposed body oscillations are realized for low amplitude of oscillation, A/D = 0.4 and for high amplitudes, A/D = 1.0. As the intention is to analyze the amplitude influence in the wake dynamics, the frequency of oscillation is fixed and chosen to be inside the lock-in region, 0.95fs, where fs is the shedding frequency of fixed cylinder. The three-dimensional wake characteristics of the oscillatory body simulations are compared to the fixed body. Floquet stability analysis of two-dimensional oscillatory flow is carried out to complete the investigation and consistently analyze the three-dimensional flow results. The different unstable modes are identified for each of the cases, and they are found to depend basically on the vortex patterns.
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ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
June 10–15, 2007
San Diego, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4269-X
PROCEEDINGS PAPER
Three Dimensional Wake Structures of Flow Around an Oscillating Circular Cylinder
Rafael S. Gioria,
Rafael S. Gioria
University of Sa˜o Paulo, Sa˜o Paulo, SP, Brazil
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Bruno S. Carmo,
Bruno S. Carmo
Imperial College London, London, UK
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Julio R. Meneghini
Julio R. Meneghini
University of Sa˜o Paulo, Sa˜o Paulo, SP, Brazil
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Rafael S. Gioria
University of Sa˜o Paulo, Sa˜o Paulo, SP, Brazil
Bruno S. Carmo
Imperial College London, London, UK
Julio R. Meneghini
University of Sa˜o Paulo, Sa˜o Paulo, SP, Brazil
Paper No:
OMAE2007-29268, pp. 833-839; 7 pages
Published Online:
May 20, 2009
Citation
Gioria, RS, Carmo, BS, & Meneghini, JR. "Three Dimensional Wake Structures of Flow Around an Oscillating Circular Cylinder." Proceedings of the ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. Volume 3: Pipeline and Riser Technology; CFD and VIV. San Diego, California, USA. June 10–15, 2007. pp. 833-839. ASME. https://doi.org/10.1115/OMAE2007-29268
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