Numerical Analysis of Two-degrees-of -freedom VIV of Deepwater Riser

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Journal of Vibration and Shock ›› 2010, Vol. 29 ›› Issue (9) : 206-211.

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Numerical Analysis of Two-degrees-of -freedom VIV of Deepwater Riser

Tang Shi-zhen;Huang Wei-ping;Liu Jian-jun

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Abstract

For the more realistic case, a numerical method was used to analyze the two degrees of freedom vortex-induced vibration(VIV). To study the relationship between the in-line vibration frequency and the cross-flow frequency for four mass ratios (m*=14.45,8.30,3.50 and m*=1.87). The results show that the in-line frequency will be twice of that in cross-flow direction when the mass ratio m*=14.45 and 8.30, the response amplitude in in-line direction can be neglected compared with that in cross-flow direction, which is in accordance with the experimental results. When the mass ratio m*=3.50 and1.87, the in-line response amplitude can’t be neglected, especially when the in-line vibration is under a lock-in situation. The main frequency also remain the same relationship, but except for the main frequency, there are the same or similar frequency components.

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ocean engineering / deepwater riser / vortex-induced vibration / two-degrees-of-freedom

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Tang Shi-zhen;Huang Wei-ping;Liu Jian-jun. Numerical Analysis of Two-degrees-of -freedom VIV of Deepwater Riser[J]. Journal of Vibration and Shock, 2010, 29(9): 206-211