基于STAR-CCM+的系泊浮体离散元模拟研究

Numerical Investigation on Discrete Element Method Simulation of Moored Floating Bodies Based on STAR-CCM+

中文关键词:  离散元方法  系泊锚链  轴向刚度  系泊浮体运动  系泊张力

英文关键词:Discrete Element Method (DEM)  mooring chain  axial stiffness  motion of floating body  mooring tension

中文摘要:

      离散元（Discrete Element Method，DEM） 方法通过连接接触模型，具备准确模拟浮体系泊锚链相关行为的潜质。本文基于STAR-CCM+软件， 采用有限体积法（Finite volume method， FVM）求解浮体运动，采用DEM方法模拟系泊锚链，构建了波浪与系泊浮体相互作用的数值模型，利用现有实验数据验证了STAR-CCM+结合DEM模块模拟浮体及其系泊系统水动力特性的准确性，并探究了系泊锚链轴向刚度对浮体运动和锚链受力的影响。结果表明：STARCCM+结合DEM模块能合理地模拟波浪与浮体相互作用时涉及的浮体运动和系泊锚链受力问题；相较于目前常用的系泊模块，DEM方法在模拟浮体的纵荡、纵摇以及系泊锚链受力方面表现出一定优势；浮体的纵荡和垂荡会随着锚链轴向刚度的增大而增大，且会出现相位差异，但当锚链刚度增大至一定程度后，浮体纵荡会减小，而浮体垂荡受锚链轴向刚度影响较小。

英文摘要:

      The Discrete Element Method (DEM) has the potential to accurately simulate the behaviors associated with the mooring chain of floating structures through its contact models. In this paper, a numerical model is constructed to analyze the interaction between waves and moored floating bodies using STAR-CCM+ software. The motion of the floating body is solved using the Finite Volume Method (FVM), while the mooring chain is simulated using the DEM. Existing experimental data is utilized to validate the accuracy of the hydrodynamic characteristics of the floating body and its mooring system when using the STAR-CCM+ with the DEM module. Additionally, the impact of the axial stiffness of the mooring chain on the motion of the floating body and the forces acting on the chain is investigated. The results demonstrate that STAR-CCM+ combined with the DEM module is capable of effectively simulating the motion of the floating body and the forces on the mooring chain during wave interactions. Compared to commonly used mooring modules, the DEM method shows certain advantages in simulating the surge, pitch, and the mooring forces. It is observed that the surge and heave of the floating body increase with the axial stiffness of the mooring chain and exhibit phase differences. However, when the stiffness of the mooring chain reaches a certain level, the surge of the floating body decreases, while the heave is less affected by the axial stiffness of the mooring chain.