Challenges on the numerical prediction of slamming loads on LNG tank insulation panels
Challenges on the numerical prediction of slamming loads on LNG tank insulation panels
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DOI：
10.1016/j.oceaneng.2017.06.041
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发表时间：
2017-09
影响因子：
5
通讯作者：
S. Marrone;A. Colagrossi;J. S. Park;E. Campana
中科院分区：
文献类型：
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作者：
S. Marrone;A. Colagrossi;J. S. Park;E. Campana
涉及复杂几何形状的水冲击问题中的载荷评估对于数值求解器来说是一项非常具有挑战性的任务。事实上，自由表面的大变形、气垫和可能的可压缩性效应的出现使标准计算流体动力学(CFD)程序达到了极限。本文采用增强型光滑粒子流体动力学(SPH)模型计算了光滑和波纹壁板表面冲击水的压力，并将计算结果与实验数据和解析解进行了比较。具体地说，首先研究了平板在4°时的入水问题，以突出具有小死角的水冲击数值解的主要关键方面。然后，考虑了LNG储罐中采用的Mark III型隔热板(波纹保温板)的水冲击。对平板和波纹板材进行了湿跌落试验，并在板材表面的几个点上测量了冲击过程中的压力。流动的复杂特征，如3D效果和气垫，已经通过逐步增加复杂性的数值研究来解决。
The load assessment in water impacts problems involving complex geometries is generally a quite challenging task for numerical solvers. Indeed, the occurrence of large free-surface deformation, air cushioning and possible compressibility effects strain the standard Computational Fluid Dynamics (CFD) codes to their limits. In the present work, an enhanced Smoothed Particle Hydrodynamics (SPH) model is adopted to evaluate the pressures acting on the surface of smooth and corrugated panels impacting water and the numerical outcomes are compared to experimental data and analytical solutions. Specifically, the water entry of a flat panel at 4° is firstly studied in order to highlight the main critical aspects underlying the numerical solution of water impacts with small deadrise angles. Then, the water impact of a Mark III type panel (a corrugated insulation panel) adopted in LNG tanks is considered. Experimental data involving wet drop tests of both flat and corrugated panels have been performed and the pressures during the impact have been measured at several points along the panel surface. Complex features of the flow, such as 3D effects and air-cushioning, have been addressed by a developing the numerical study in steps of increasing complexity.