发表机构
University College Dublin; University of Zagreb（都柏林大学学院; 萨格勒布大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出有限体积致动线方法，实现几何精确梁与不可压缩流体的双向耦合，通过保守传递算子与阻力闭合，经渠道和波浪实验验证，准确模拟细长柔性结构流固耦合。
AI 中文摘要
系泊缆、水产养殖网和水生植被等细长柔性结构过于纤细，难以通过贴体网格经济地解析，但它们与流体在两个方向上交换动量。本文提出了一种用于此类结构流固耦合的有限体积致动线公式，其中通过单元中心有限体积离散的几何精确Simo-Reissner梁，通过保守且并行一致的传递算子与不可压缩有限体积流动求解器双向耦合。在每个梁控制体上游采样流体速度，准稳态Morison型阻力闭合评估线力，等大反向的反作用力通过归一化高斯核投影到流体动量方程中，该核保持力守恒。两个子系统共享离散化、时间循环和区域分解，因此无需外部结构代码，OpenFOAM实现已公开发布。仅阻力闭合的准确性及其成立条件通过两个渠道基准和一个波浪水槽实验进行了量化，所有阻力系数事先固定。在稳态受限渠道流中，壁挂式悬臂梁的尖端挠度落在已发表的连续介质解范围内。对于正弦渠道流中的柔性小叶，在较长强迫周期下，峰值尖端偏移偏离参考值。小叶随后相对于周围流体移动更远，因此闭合所忽略的附加质量力和历史力变得重要。在波浪水槽中，模拟茎重现了实测的模态形状、波内不对称性和基底力，并恢复了振荡范围的71%至83%。准静态重建测试将剩余不足归因于被忽略的流体惯性，而非结构模型。
英文摘要
Slender flexible structures such as mooring lines, aquaculture netting, and aquatic vegetation are too thin to be resolved economically by a body-fitted mesh, yet they exchange momentum with the flow in both directions. This paper presents a finite volume actuator-line formulation for the fluid--structure interaction of such structures, in which a geometrically exact Simo--Reissner beam, discretised by cell-centred finite volumes, is coupled two-way to an incompressible finite volume flow solver through conservative, parallel-consistent transfer operators. The fluid velocity is sampled upstream of each beam control volume, a quasi-steady Morison-type drag closure evaluates the line force, and the equal and opposite reaction is projected into the fluid momentum equation through a normalised Gaussian kernel that conserves force. The two subsystems share a discretisation, time loop, and domain decomposition, so no external structural code is required, and the OpenFOAM implementation is released publicly. The accuracy of the drag-only closure and the conditions over which it holds are quantified against two channel benchmarks and a wave-flume experiment, with all drag coefficients fixed in advance. In a steady confined channel flow the tip deflection of a wall-mounted cantilever falls within the range of published continuum solutions. For a flexible leaflet in sinusoidal channel flow the peak tip excursion departs from the reference at the longer forcing period. The leaflet then moves further relative to the surrounding fluid, so added-mass and history forces, which the closure omits, become important. In the wave flume the simulated stem reproduces the measured mode shape, intra-wave asymmetry, and base force, and recovers 71--83% of the oscillation range. A quasi-static reconstruction test places the remaining shortfall in omitted fluid inertia rather than in the structural model.
Comments55 pages, 30 images
