移动射流切削黏土过程的ALE数值方法

ALE numerical method of clay-cutting process by mobile water jet

射流在港口航道疏浚和海底冲沟等黏土施工中得到广泛应用,但对移动射流与黏土的相互作用过程研究较少,制约了射流技术在黏土切削施工中的高效应用。目前移动射流切削黏土过程的有效数值方法还较为缺乏,采用任意拉格朗日-欧拉(ALE)方法,对移动射流切削黏土过程的数值模拟进行了探讨。结合软件提供的运动函数与射流源模拟移动射流的连续喷射,采用ALE网格解决射流切削界面网格大变形问题,通过侵蚀算法模拟黏土的失效行为。结果显示,无论是切削沟槽的形状,还是横截面和纵截面的具体尺寸,模拟与实验均较为吻合,表明本文采用的数值方法可以有效地模拟射流切削黏土过程。研究成果可为射流破土过程的机理性探索提供有效的数值方法。

The jet is widely used in the clay construction,such as port channel dredging and seabed gully,but less research on the interaction process of mobile jet and clay,which restricts the efficient application of jet technology in clay cutting construction.At present,the effective numerical method of the moving jet cutting clay process is still lacking.In this paper,we used an Arbitrary Lagrange-Euler(ALE)method to simulate the numerical simulation of the clay process of moving jet cutting.Combining the motion function provided by the software and the jet source to simulate the continuous jet of the moving jet,we used the ALE grid to solve the large deformation problem of the jet cutting interface mesh,and simulated the failure behavior of the clay by the erosion algorithm.The results show that both the shape of the cutting grooves and the concrete size of the cross section and the longitudinal section are in good agreement with the experiment.It shows that the numerical method used in this paper can effectively simulate the process of the jet cutting clay.The research results can provide an effective numerical method for exploring the mechanism of the jet breaking process.