基于CEL方法对拖锚过程的数值分析

船锚的正常工作关系到船舶的安全运营,锚在底质中运动规律的研究一直吸引着众多学者,由于锚在土中的拖动过程中时刻发生着土的大变形和破坏,涉及到材料非线性、几何非线性及接触非线性等诸多力学问题,通过解析的研究手段很难准确地分析拖锚过程。笔者采用霍尔锚进行了物理模型试验,通过模型试验测试了拖锚过程运动特性和锚的姿态变化,采用耦合的欧拉-拉格朗日方法(CEL)建立了拖锚过程的计算分析模型,对模型试验进行模拟。通过计算得到了拖锚过程中锚的姿态随拖锚距离的变化,给出了锚的入土深度随水平位移的关系,计算结果与试验结果较吻合,验证了该分析方法在分析拖锚问题上的合理性。该方法可用于拖锚过程的研究和相关设计。

Numerical Analysis on Dragging Anchors in Soil Based on CEL

The performance of anchors relates to the safe operation of the vessel,the research of movement rules of the anchor in the sediment has been concerned by many scholars.The large deformation and failure of soil happened every moment in the process of dragging anchors,involved many mechanical behavior,such as material nonlinearity,geometric nonlinearity and contact nonlinearity,etc.So it may be difficult to study the dragging anchors through the general analytical research tools.In this paper,the physical model test was carried out used the model Hall anchor,and the movement characteristics and attitude variation of the anchor was measured in the dragging process.Then a numerical calculation model was established to simulated the model test based on the Coupled Eulerian-Lagrangian (CEL).The postural changes of the anchor with the dragged distance were depicted,and the buried depth of the anchor along with the horizontal displacement was plotted.The contrast of the numerical and measured results showed good consistency,which verified the reasonability of the CEL method on analyze the dragging anchors.This method can be used for the research and design of dragging anchors.