动边界条件下平底结构砰击水面的水动力分析

Hydrodynamic Analysis Considering Dynamic Boundary Under Slamming by Flat-Bottom Structure

采用VOF和动网格方法,考虑开放或限制水域边界条件的约束因素,利用计算流体动力学(CFD)方法研究平底结构砰击开放或限制水域的水面所引起的三维水动力现象,分析了由数值模拟得到的平底结构动边界条件下的多压力峰值现象及其产生机理.数值模拟与实验室模型试验结果的比较表明,采用所提出的数值方法可以得到符合实际的水动力分析结果,文中方法可有效模拟平底结构砰击压力作用于考虑自由表面效应的开放或限制水域时所激发的水面波动和水下压力场变化.

In this paper,the open or restricted water under the slamming by a flat-bottom structure is taken as the research object,and a computational fluid dynamics（CFD） technique is used to investigate the 3D hydrodynamic characteristics of the water.The investigation is conducted by using the volume of fluid（VOF） method and the dynamic mesh method,with the factors of open or restricted boundary conditions being considered.Moreover,the phenomena of multiple pressure peak values observed during the slamming simulation are analyzed,and the corresponding generation mechanisms are discussed.The comparison between the simulated and the experimental results indicate that the proposed numerical method helps to analyze the hydrodynamic characteristics reasonably,and that it can effectively simulate the wave-making and underwater pressure distribution variation agitated by the slamming of the flat-bottom structure on the open or restricted water with free surface.