The vibratory response of a long slender riser, made of composite materials and subject to an ocean current, is studied for a range of conditions. The influence of the number of modes of vibration is studied as is the influence of the mass ratio and the value of the damping coefficient. The flow past the riser is represented by a shear flow, ranging from Re = 8000 at the lower end of the riser to Re = 10,000 at the upper end of the riser. The riser vibration is treated as a coupled fluid-flow/vibration problem. The fluid-flow equations are represented by a Large Eddy Simulation model for the wake turbulence present in the flow. Strip theory is used to represent different forcing locations along the length of the riser. Since the composite riser has a variable damping coefficient, which decreases with increasing frequency, its response is different from, say, a steel riser with a constant damping coefficient. The composite riser, with variable damping, has a larger RMS displacement than a riser with constant damping. The vibration amplitude is found to increase with an increase in number of modes.
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ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
June 12–17, 2005
Halkidiki, Greece
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4197-9
PROCEEDINGS PAPER
VIV of a Composite Riser at Moderate Reynolds Number Using CFD
C. Dalton
C. Dalton
University of Houston, Houston, TX
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T. Rakshit
University of Houston, Houston, TX
S. Atluri
University of Houston, Houston, TX
C. Dalton
University of Houston, Houston, TX
Paper No:
OMAE2005-67206, pp. 853-865; 13 pages
Published Online:
November 11, 2008
Citation
Rakshit, T, Atluri, S, & Dalton, C. "VIV of a Composite Riser at Moderate Reynolds Number Using CFD." Proceedings of the ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3. Halkidiki, Greece. June 12–17, 2005. pp. 853-865. ASME. https://doi.org/10.1115/OMAE2005-67206
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