A new propulsion enhancement mechanism in metachronal rowing at intermediate Reynolds numbers
A new propulsion enhancement mechanism in metachronal rowing at intermediate Reynolds numbers
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中间雷诺数异时划船的新推进增强机制
DOI：
10.1017/jfm.2023.739
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发表时间：
2023
影响因子：
3.7
通讯作者：
Li, Chengyu
中科院分区：
文献类型：
--
作者：
Lionetti, Seth;Lou, Zhipeng;Herrera-Amaya, Adrian;Byron, Margaret L.;Li, Chengyu
异时划船是许多游泳无脊椎动物（如桡足类、栉水母、磷虾和虾）采用的生物推进机制。利用这种机制游泳的动物具有一排排的附属物，它们以协调的波浪摆动。在这项研究中，我们使用的观察游泳栉水母（梳水母），以研究与异时划船的流体动力学性能和涡动力学。我们首先重建的节拍运动学的栉水母附属物的高速视频的基础上的异时协调行。重建后，两个数值模型的开发和模拟使用内部浸没边界法为基础的计算流体动力学求解器。这两个模型包括原始几何形状（一行16个附件）和稀疏几何形状（8个附件，通过沿该行沿着每隔一个附件移除形成）。我们发现，附肢尖端涡的相互作用有助于通过涡削弱机制的水动力性能。通过这种机制，在产生阻力的改出冲程中，附体尖端涡流明显减弱。因此，游泳的栉水母产生更小的总阻力，其推力功率比显着改善（高达55.0%，与稀疏模型相比）。我们的参数研究表明，这样的推进增强机制是有效的，在较高的雷诺数。模拟还被用来研究基板曲率的非定常流体动力学的影响。我们的结果表明，与平面基板相比，在弯曲基板上布置附件可以提高总推力产生高达29.5%。这些发现提供了新的见解的流体动力学原理的推进增强底层异时划船。
Metachronal rowing is a biological propulsion mechanism employed by many swimming invertebrates (e.g. copepods, ctenophores, krill and shrimp). Animals that swim using this mechanism feature rows of appendages that oscillate in a coordinated wave. In this study, we used observations of a swimming ctenophore (comb jelly) to examine the hydrodynamic performance and vortex dynamics associated with metachronal rowing. We first reconstructed the beating kinematics of ctenophore appendages based on a high-speed video of a metachronally coordinated row. Following the reconstruction, two numerical models were developed and simulated using an in-house immersed-boundary-method-based computational fluid dynamics solver. The two models included the original geometry (16 appendages in a row) and a sparse geometry (8 appendages, formed by removing every other appendage along the row). We found that appendage tip vortex interactions contribute to hydrodynamic performance via a vortex-weakening mechanism. Through this mechanism, appendage tip vortices are significantly weakened during the drag-producing recovery stroke. As a result, the swimming ctenophore produces less overall drag, and its thrust-to-power ratio is significantly improved (up to 55.0 % compared with the sparse model). Our parametric study indicated that such a propulsion enhancement mechanism is less effective at higher Reynolds numbers. Simulations were also used to investigate the effects of substrate curvature on the unsteady hydrodynamics. Our results illustrated that, compared with a flat substrate, arranging appendages on a curved substrate can boost the overall thrust generation by up to 29.5 %. These findings provide new insights into the fluid dynamic principles of propulsion enhancement underlying metachronal rowing.
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影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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影响因子：
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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通讯作者：
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