数值模拟聚焦波与浮子相互作用的不确定性研究

Study on Numerical Uncertainty of Focused Wave Interaction with Buoy

应用qaleFOAM求解器中的完全非线性势流理论(FNPT)在数值水池中生成聚焦波的FNPT域,而在浮子周围的NS域用不可压缩两相流动纳维尔-斯托克斯求解器OpenFOAM进行计算。用自校正造波器在FNPT域中产生入射波,并通过耦合边界和附加的过渡区传播到NS域。采用这样的方法,能加快计算速度和保证计算结果的准确性。对一个半球形底部的圆柱体波浪能浮子,通过计算获得纵荡、垂荡、纵摇和系泊力数据并与试验进行比较和分析。数值模拟与试验数据显示了良好的一致性。还讨论了转动惯量对计算结果的影响。

In the software qaleFOAM the fully nonlinear potential theory(FNPT)is applied to generate a focused wave in the FNPT domain of a numerical tank,while the two-phase incompressible Navier-Stokes solver OpenFOAM is utilized in the field around the buoy(NS domain).In the FNPT domain,the self-tuning wave generator is applied to generate incident waves,which propagate to the NS domain through the coupling boundary and attached transition zone.The coupling method with domain decomposition is adopted to accelerate calculation speed and ensure the accuracy of results.Surge,heave,pitch and mooring force of a cylinder buoy with hemispherical bottom are calculated and compared with the experimental data.The numerical simulation is in good agreement with that of CCP-WSI blind test.Influence of the moment of inertia on uncertainty of the results is discussed.