Numerical Analysis of Two-degrees-of -freedom VIV of Deepwater Riser
Tang Shi-zhen;Huang Wei-ping;Liu Jian-jun
Author information+
(The key Ocean Engineering laboratory of Shandong province, University of China,Qingdao,266100)
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History+
Received
Revised
Published
2009-11-09
2010-01-26
2010-09-25
Issue Date
2010-09-25
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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