ABSTRACT

The application of transient three-dimensional numerical code ITU-WAVE is presented for the prediction of hydrodynamic characteristics of floating bodies. The time histories of unsteady motions are directly presented with respect to Impulse Response Functions (IRFs). First-order steady forces of wave-resistance, sinkage force and trim moment are solved as the steady-state limit of surge radiation IRF. The numerical prediction of second-order mean force is presented using near-field method based on the direct pressure integration. The hydrodynamic and structural parts are fully coupled through modal analysis for the solution of hydroelastic analysis. A stiff structure is then studied assuming that contributions of rigid body modes are much bigger than elastic modes. A discrete control of latching is used to increase the bandwidth of the efficiency of Wave Energy Converters (WEC). ITU-WAVE numerical results for different floating bodies show satisfactory agreements compared to analytical, other numerical and experimental results.

摘要

介绍了瞬态三维数字码ITU-WAVE在浮体水动力特性预测中的应用。非定常运动的时程直接用脉冲响应函数 (IRF) 表示。求解波阻、下沉力和纵倾力矩的一阶稳态力作为浪涌辐射IRF的稳态极限。使用基于直接压力积分的近场方法提出了二阶平均力的数值预测。通过模态分析将流体动力和结构部件完全耦合，以解决水弹性分析。然后假设刚体模式的贡献远大于弹性模式，则研究​​刚性结构。锁存的离散控制用于增加波能转换器 (WEC) 效率的带宽。与分析、其他数值和实验结果相比，不同浮体的 ITU-WAVE 数值结果显示出令人满意的一致性。