Steady Flow Over a Finite Patch of Submerged Flexible Vegetation
Steady Flow Over a Finite Patch of Submerged Flexible Vegetation
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DOI：
10.1029/2023wr035222
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发表时间：
2024-01
影响因子：
5.4
通讯作者：
Hyun Dong Kim;Xiao Yu;D. Kaplan
中科院分区：
文献类型：
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作者：
Hyun Dong Kim;Xiao Yu;D. Kaplan
本文采用一种具有软体动力学的浸入式边界有限元法来研究有限块柔性水生植被上的定常流。流动结构相互作用模型可以解决流动与柔性植被的相互作用，从而植被叶片的重构环境流。流动动力学强烈依赖于两个无量纲参数，即植被密度和柯西数（定义为流体阻力与弹性力的比值）。根据植被密度和柯西数，识别出5种不同的流态，包括有限河段流态、摇摆流态、“单波”A流态、“单波”B流态和倾向流态。“monami”B型出现在高植被密度下，与“monami”A型不同，后者中Kelvin-Helmholtz波的通过强烈影响植被界面。利用柔体动力学，还可以解决叶片与叶片之间的相互作用。在高植被密度下，水动力相互作用在叶片间相互作用中起重要作用，其中相邻植被叶片通过间隙流体压力相互作用。在低植被密度下，植被叶片之间的直接接触对防止植被叶片的非物理穿透起着重要作用。
An immersed boundary‐finite element with soft‐body dynamics has been implemented to study steady flow over a finite patch of submerged flexible aquatic vegetation. The flow structure interaction model can resolve the flow interactions with flexible vegetation, and hence the reconfiguration of vegetation blades to ambient flow. Flow dynamics strongly depend on two dimensionless parameters, namely vegetation density and Cauchy number (defined as the ratio of the fluid drag force to the elastic force). Five different flow patterns have been identified based on vegetation density and Cauchy number, including the limited reach, swaying, “monami” A, “monami” B with slow moving interfacial wave, and prone. The “monami” B pattern occurred at high vegetation density and is different from “monami” A, in which the passage of Kelvin‐Helmholtz billows strongly affects the vegetation interface. With soft‐body dynamics, blade‐to‐blade interactions can also be resolved. At high vegetation density, the hydrodynamic interactions play an important role in blade‐to‐blade interactions, where adjacent vegetation blades interact via the interstitial fluid pressure. At low vegetation density, direct contacts among vegetation blades play important roles in preventing unphysical penetration of vegetation blades.