A 3D parallel particle-in-cell solver for extreme wave interaction with floating bodies
A 3D parallel particle-in-cell solver for extreme wave interaction with floating bodies
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DOI：
10.1016/j.oceaneng.2019.02.047
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发表时间：
2019-05
影响因子：
5
通讯作者：
Qiang Chen;J. Zang;D. Ning;C. Blenkinsopp;Junliang Gao
中科院分区：
文献类型：
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作者：
Qiang Chen;J. Zang;D. Ning;C. Blenkinsopp;Junliang Gao
浮式结构物广泛应用于船舶、海上平台等，近年来又被考虑用于深水浮式海上风力发电系统和波浪能装置。然而，模拟复杂的波浪与浮式结构物的相互作用，特别是在极端条件下，仍然是一个重要的挑战。在三维（3D）并行PIC模型的基础上，本文进一步扩展了该方法，发展了一种新的三维并行PIC模型，并将其应用于浮体。PIC模型使用拉格朗日粒子和欧拉网格来求解不可压缩Navier-Stokes方程，试图将拉格朗日处理大自由表面变形的灵活性和欧拉在CPU成本方面的效率结合起来。波-结构相互作用的解决，通过包含一个基于笛卡尔割元法的双向强流固耦合算法，是稳定和有效的。数值模型与三维聚焦波与系泊浮标相互作用的实验进行了对比验证。对于浮筒的运动和系泊力，数值计算结果与实验结果吻合较好。此外，PIC模型在极端波浪-结构相互作用情况下实现了与最先进的OpenFOAM®模型相同的CPU效率。
Floating structures are widely used for vessels, offshore platforms, and recently considered for deep water floating offshore wind system and wave energy devices. However, modelling complex wave interactions with floating structures, particularly under extreme conditions, remains an important challenge. Following the three-dimensional (3D) parallel particle-in-cell (PIC) model developed for simulating wave interaction with fixed bodies, this paper further extends the methodology and develops a new 3D parallel PIC model for applications to floating bodies. The PIC model uses both Lagrangian particles and Eulerian grid to solve the incompressible Navier-Stokes equations, attempting to combine both the Lagrangian flexibility for handling large free-surface deformations and Eulerian efficiency in terms of CPU cost. The wave-structure interaction is resolved via inclusion of a Cartesian cut cell method based two-way strong fluid-solid coupling algorithm that is both stable and efficient. The numerical model is validated against 3D experiments of focused wave interaction with a floating moored buoy. Good agreement between the numerical and experimental results has been achieved for the motion of the buoy and the mooring force. Additionally, the PIC model achieves a CPU efficiency of the same magnitude as that of the state-of-the-art OpenFOAM®model for an extreme wave-structure interaction scenario.