自升式平台湿拖过程中的二阶波浪力增阻分析

波浪引起的二阶平均波浪力附加阻力是自升式平台湿拖过程中总阻力的重要组成部分。基于三维势流理论分析了影响自升式平台湿拖过程中附加阻力的相关参数,包括Jonswap谱γ值、航速以及波浪要素等,进行了敏感性分析。研究结果表明:计算二阶波浪力增阻所选取的Jonswap谱γ值取3.5更为合理;二阶力增阻对波浪周期的变化较为敏感,实际拖航阻力估算只需考虑静水拖航阻力和实际海况的双重作用,可略去航速的影响;并验证了二阶波浪力增阻值与有义波高的平方成正比,提供了一种可靠的二阶力增阻估算方法。

Analysis of the increase of resistance of second order wave force in the wet towing process of a Jack-up Platform

The second-order average wave force caused by wave is an important part of the production storage and offloading Jack-up platform during wet towing.Based on the theory of three-dimensional potential theory and hydrodynamic analysis software AQWA,second-order average wave force during the wet tow process of the Jack-up with speed is computed and analysed.The analysis of the parameter sensitivity of the parameters that affect the second order wave forces, including the JONSWAP spectrumvalue, speed, and the wave factors are studied. The value of spectrum peak factorhas significant influence on the increased resistance of the second order wave force. When= 3.5, the second order wave force is the largest. The increased resistance of second order force is quite sensitive to the variation of the wave period. The increased resistance of second order wave force is positively proportional to the square of the height of significant wave.The effects of towing speed to the second-order weave force is not significant.