Impact Analysis of Air Gap Motion with Respect to Parameters of Mooring System for Floating Platform

• Published in: China ocean engineering 2017-04, Vol.31 (2), p.141-150
• Main Authors: Shen, Zhong-xiang, Huo, Fa-li, Nie, Yan, Liu, Yin-dong
• Format: Article
• Language: English
• Subjects: Air; Coastal Sciences; Computer simulation; Elasticity; Engineering; Floating; Fluid- and Aerodynamics; Impact analysis; Loads (forces); Marine & Freshwater Sciences; Mathematical models; Mooring; Mooring lines; Mooring systems; Numerical and Computational Physics; Oceanography; Offshore Engineering; Offshore oil wells; Parameters; Semisubmersible platforms; Simulation; Submersible platforms; Submersibles; Tuff; Wave tanks; Wind loads; Wind tunnel models; Wind tunnels; 数值模型; 模型试验; 气隙; 浮式平台; 电流负载; 系泊系统; 计算结果; 运动
• ISSN: 0890-5487; 2191-8945
• DOI: 10.1007/s13344-017-0017-2

In this paper, the impact analysis of air gap concerning the parameters of mooring system for the semi-submersible platform is conducted. It is challenging to simulate the wave, current and wind loads of a platform based on a model test simultaneously. Furthermore, the dynamic equivalence between the truncated and full-depth mooring system is still a tuff work. However, the wind and current loads can be tested accurately in wind tunnel model. Furthermore, the wave can be simulated accurately in wave tank test. The full-scale mooring system and the all environment loads can be simulated accurately by using the numerical model based on the model tests simultaneously. In this paper, the air gap response of a floating platform is calculated based on the results of tunnel test and wave tank. Meanwhile, full-scale mooring system, the wind, wave and current load can be considered simultaneously. In addition, a numerical model of the platform is tuned and validated by ANSYS AQWA according to the model test results. With the support of the tuned numerical model, seventeen simulation cases about the presented platform are considered to study the wave, wind, and current loads simultaneously. Then, the impact analysis studies of air gap motion regarding the length, elasticity, and type of the mooring line are performed in the time domain under the beam wave, head wave, and oblique wave conditions.