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| Hydrodynamic Characteristics of Tension Leg Platforms in Ocean Internal Solitary Waves |
YOU Yunxiang1,LI Wei1,SHI Zhongmin2,QU Yan2,XIAO Yue2 |
| (1. State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. China National Offshore Oil Corperation Research Center, Beijing 100027, China） |
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Abstract Based on the mKdV theory of internal solitary waves in a twolayer fluid, a theoretical model for analyzing the interaction of internal solitary waves with tension leg platforms was presented by using coupling motion equations of six degrees of freedom for the floating body combining with the modified Morison formula. The observational data near the Dongsha Island were used as the characteristic parameters of the internal solitary wave, the characteristics of hydrodynamic load and motion response, as well as tension changs of the tethers for the ISSCTLP due to such an internal solitary wave were computed and analyzed. The results show that internal solitary waves will give rise to sudden impact load and motion response with the large amplitude, as well as remarkable increase of the tether tension. Therefore, the influence of internal solitary waves on the hydrodynamic characteristics of the deepsea platforms including TLP can not be neglected in their designs and applications.
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Received: 20 April 2009
Published: 29 January 2010
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