摘要
航行体入水问题因其具有重要的军事应用价值而受到广泛关注,海洋波浪环境往往对入水过程的流体动力特性产生重要影响。该文通过数值模拟手段研究水体存在规则波时的圆柱体入水过程,利用VOF算法对气液两相界面进行捕捉,使用速度边界造波法在求解域生成有效的规则波,通过滑移网格方案控制圆柱体平动和转动。研究了倾斜角度入水的圆柱体在不同波高和波长组合以及不同入水速度下的多相流场和弹体的动力学特性。空泡在不同相位入水时将显著受到速度场的漂移作用,除了初始相位之外,随着圆柱体的水平位移,还将受到下一个相位速度场的影响,不同漂移方向使得空泡演化展现出不一样的特性。该文定义了一个无量纲数A/gk/V_(0)表征波浪运动和入水行为的相对大小,在入水的早期阶段可以有效量化入水的空泡行为。相对入水速度被初始相位的速度场改变,在跨越相位区域时又会发生变化。在考虑的所有工况中,A/gk/V_(0)对入水抨击荷载展现出很好的正相关性。
Water entry has been widely employed in naval weapon due to its significant military value,but ocean waves in the marine environment often have a great effect on water entry process.This study employs numerical methods to investigate cylinder water entry in the presence of regular waves.The Volume of Fluid(VOF)model is utilized to capture two-phase,and a velocity boundary wave generation method is used to create regular wave.A sliding grid scheme is employed to control the translational and rotational motion of the cylinder.This study focuses on the multiphase flow field and body dynamic characteristics at different wave heights,wavelengths,wave phase and entry velocities.The cavities are significantly affected by the velocity field at different phases.In addition to the initial phase,as the cylinders move horizontally,they will also be affected by the next phase velocity field.Different drift directions result in distinct cavity characteristics.In this study,a dimensionless number A/gk/V_(0)is defined to quantify the relative importance of wave motion and water entry.It can effectively quantify cavity behavior in the early stages.The relative velocity is changed by the initial phase velocity field and changes again when the body crosses the phase region.In all the considered conditions in this study,A/gk/V_(0)exhibits a strong positive correlation with the impact loads.
作者
刘珑翔
陈瑛
Liu Longxiang;Chen Ying(Key Laboratory of Hydrodynamics(Ministry of Education),School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao TongUniversity,Shanghai 200240,China)
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2024年第4期509-521,共13页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金(11872247,11472174)。
关键词
入水
波浪场
空泡
圆柱体
Water entry
Wave field
Cavity
Cylinder
