基于黏流理论的半潜式平台近场干涉数值计算

Numerical Calculating on Near Field Interference of Semi-Submersible Platform Base on Viscous Flow Theory

以工作水深为250m的半潜式平台为研究对象,基于黏流理论开展规则波和不规则波作用下半潜式平台3种模式(固定、自由、系泊)的数值计算。自编程开发半潜式平台近场干涉数值计算后处理软件,研究平台立柱间发生近场干涉现象的基本规律。计算结果表明:周期较小时,入射波、反射波与辐射波叠加较为频繁,立柱间波面升高较大;浪向角对平台近场干涉效应有较大影响,浪向角为45°时近场干涉现象更为明显,波面升高极大值主要集中于后立柱内侧区域,最大波面升高可达入射波高的2.57倍;平台系泊和自由模式比固定模式近场干涉引起的波面升高大,波面分布较复杂。

A semi-submersible platform with a working water depth of 250 m is taken as the research object. Based on the theory of viscous flow, numerical calculation of three modes （fixed, free, mooring） of semi-submersible platform under regular waves and irregular waves is calculated based on the viscous flow theory. The basic rule of near field interference be- tween platform columns is studied by programming the software of the semi-submersible plat- form for near field interference. The calculation results show that： when the period is small, the incident wave, the reflected wave and the radiation wave superposition are more frequent, and the wave surface between the columns increases greatly~ the wave direction angle has great influence on the near field interference effect of the platform, and the near field interfer- ence phenomenon is more obvious when the wave angle is 45 ; the maximum value of wave ele- vation is mainly concentrated in the inner area of the rear column, and the maximum wave sur- face can rise to 2.57 times the incident wave height, the wavefront caused by the near field in- terference of platform mooring and freestyle mode is higher than that of the fixed mode, andthe wavefront distribution is more complicated.