ABSTRACT

A numerical method that coupled a Reynolds-averaged Navier-Stokes solver with a quasi-static and a dynamic mooring model was employed and compared. Decay tests of the freely floating and the moored buoy in calm water determined the system's linear and quadratic damping characteristics. In regular waves, predicted heave and pitch amplitudes and high-frequency surge amplitudes based on the quasi-static mooring model were similar to those based on the dynamic mooring model and similar to comparable measurements. However, the low-frequency surge and pitch motions based on the quasi-static model deviated significantly from the corresponding motions based on the dynamic model and from measurements. In irregular waves, buoy motion amplitudes, especially in surge, based on the quasi-static model were overpredicted. The accurate evaluation of the moored buoy in irregular waves, especially when the moored buoy underwent large translations, was possible only by accounting also for the dynamic loads acting on the mooring lines.

摘要

采用并比较了一种将雷诺平均 Navier-Stokes 求解器与准静态和动态系泊模型耦合的数值方法。静水中自由漂浮和系泊浮标的衰减测试确定了系统的线性和二次阻尼特性。在常规波浪中，基于准静态系泊模型的预测升沉和纵摇幅度以及高频浪涌幅度与基于动态系泊模型的相似，并且与可比的测量值相似。然而，基于准静态模型的低频浪涌和俯仰运动与基于动态模型和测量的相应运动存在显着差异。在不规则波浪中，基于准静态模型的浮标运动幅度，特别是在浪涌中，被高估了。