| Effect of Internal Flow on Vortex-Induced Vibration of Submarine Free Spanning Pipelines |
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| 作者姓名： | 娄敏 丁坚 郭海燕 董晓林 |
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| 作者单位： | [1]CollegeofEngineering,OceanUniversityofChina,Qingdao266071,China [2]OceanCollege,HohaiUniversity,Nanjing210098,China |
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| 基金项目： | This Project was fincianlly supported by the National Natural Science Foundation of China (Grant No. 50379050) |
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| 摘 要： | At present, most researches on the vortex-induced vibration of submarine free spanning pipelines ignore the effect of internal flowing fluid; furthermore, there are no research reports considering the coupling effect of internal and external fluid with the free span. In this paper, combining Iwan‘s wake oscillator model with the differential equation derived for the dynamic response of submarine free spanning pipelines with inclusion of internal flow, the pipe-fluid coupling equations are developed to investigate the effect of internal flow on the vortex-induced vibration of the free spans. The finite dement approximation is implemented to derive the matrix equations of equilibrium. The Newmark method combined with simple iteration is used to solve the system of equations. The results indicate that the internal fluid flow may cause the shift of resonance band to the lower frequency and a slight decrease in the peak value; the effect will be mare pronounced with the increase of the span length and can be weakened in the presence of the axial tension.
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| 关 键 词： | 漩涡-人工振动 内部流体 自由跨距 海底石油管线 |
Effect of Internal Flow on Vortex-Induced Vibration of Submarine Free Spanning Pipelines |
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| LOU Min a,DING Jian b,GUO Hai-yan a,and DONG Xiao-lin aaCollege of Engineering,Ocean University of China,Qingdao ,ChinabOcean College,Hohai University,Nanjing ,China.Effect of Internal Flow on Vortex-Induced Vibration of Submarine Free Spanning Pipelines[J].China Ocean Engineering,2005,19(1):147-154. |
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| Authors: | LOU Min a DING Jian b GUO Hai-yan a and DONG Xiao-lin aaCollege of Engineering Ocean University of China Qingdao ChinabOcean College Hohai University Nanjing China |
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| Institution: | LOU Min a,DING Jian b,GUO Hai-yan a,1and DONG Xiao-lin aaCollege of Engineering,Ocean University of China,Qingdao 266071,ChinabOcean College,Hohai University,Nanjing 210098,China |
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| Abstract: | At present, most researches on the vortex-induced vibration of submarine free spanning pipelines ignore the effect of internal flowing fluid; furthermore, there are no research reports considering the coupling effect of internal and external fluid with the free span. In this paper, combining Iwan's wake oscillator model with the differential equation derived for the dynamic response of submarine free spanning pipelines with inclusion of internal flow, the pipe-fluid coupling equations are developed to investigate the effect of internal flow on the vortex-induced vibration of the free spans. The finite element approximation is implemented to derive the matrix equations of equilibrium. The Newmark method combined with simple iteration is used to solve the system of equations. The results indicate that the internal fluid flow may cause the shift of resonance band to the lower frequency and a slight decrease in the peak value; the effect will be more pronounced with the increase of the span length and can be weakened in the presence of the axial tension. |
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| Keywords: | vortex-induced vibration internal flow free span submarine pipelines |
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