A Three-dimensional Particle Method for Violent Sloshing under Regular and Irregular Excitations
A Three-dimensional Particle Method for Violent Sloshing under Regular and Irregular Excitations
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DOI：
10.1016/j.oceaneng.2016.05.015
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发表时间：
2016-07
影响因子：
5
通讯作者：
M. Luo;C. Koh;W. Bai
中科院分区：
文献类型：
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作者：
M. Luo;C. Koh;W. Bai
在一致性粒子法（CPM）的框架下，提出了一个三维（3D）数值模型。基于泰勒级数展开推导了三维梯度和拉普拉斯算子，获得了良好的精度，并在很大程度上缓解了虚假压力波动的问题。提出了一种精确的边界识别方法来确定高度变形的自由曲面。通过平移和旋转激励下的水晃动的实验研究验证，该模型在长时间模拟涉及流体合并和分裂的剧烈自由表面流动中具有鲁棒性和准确性。利用验证后的数值模型，对真实的船舶在海浪激励下的液体天然气晃荡进行了研究。结果表明，横浪航行时的晃荡波最为剧烈，严重影响船舶运动的稳定性。讨论了不同激励下的各种波型。
A three-dimensional (3D) numerical model is presented in the framework of Consistent Particle Method (CPM). The 3D gradient and Laplacian operators are derived based on Taylor series expansion, achieving good accuracy and largely alleviating the problem of spurious pressure fluctuation. An accurate boundary recognition scheme is introduced to determine the highly deformed free surface. Validated by our experimental studies of water sloshing under translational and rotational excitations, this model is shown to be robust and accurate in long time simulation of violent free surface flows which involve fluid merging and splitting. Using the validated numerical model, liquefied natural gas sloshing in a real ship under sea excitations is investigated. It is found that the sloshing waves in the beam sea sailing condition is the most violent and seriously affects the stability of ship motion. Various wave patterns under different excitations are discussed.