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首页> 外文期刊>Bioinspiration & biomimetics >Fluid-structure interaction modeling on a 3D ray-strengthened caudal fin
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Fluid-structure interaction modeling on a 3D ray-strengthened caudal fin

机译：3D射线强化尾鳍上的流体结构相互作用建模

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摘要

In this paper, we present a numerical model capable of solving the fluid-structure interaction problems involved in the dynamics of skeleton-reinforced fish fins. In this model, the fluid dynamics is simulated by solving the Navier-Stokes equations using a finite-volume method based on an overset, multi-block structured grid system. The bony rays embedded in the fin are modeled as nonlinear Euler-Bernoulli beams. To demonstrate the capability of this model, we numerically investigate the effect of various ray stiffness distributions on the deformation and propulsion performance of a 3D caudal fin. Our numerical results show that with specific ray stiffness distributions, certain caudal fin deformation patterns observed in real fish (e.g. the cupping deformation) can be reproduced through passive structural deformations. Among the four different stiffness distributions (uniform, cupping, W-shape and heterocercal) considered here, we find that the cupping distribution requires the least power expenditure. The uniform distribution, on the other hand, performs the best in terms of thrust generation and efficiency. The uniform stiffness distribution, per se, also leads to 'cupping' deformation patterns with relatively smaller phase differences between various rays. The present model paves the way for future work on dynamics of skeleton-reinforced membranes.
机译：在本文中，我们介绍了一种能够解决骨架增强鱼翅片动态涉及的流体结构相互作用问题的数值模型。在该模型中，通过使用基于推/多块结构电网系统的有限体积方法求解Navier-Stokes方程来模拟流体动力学。嵌入翅片中的骨射线被建模为非线性欧拉 - 伯尔诺梁。为了证明该模型的能力，我们对各种射线刚度分布对3D尾鳍变形和推进性能的影响。我们的数值结果表明，具有特定的射线刚度分布，可以通过被动结构变形来再现在真实鱼（例如拔罐变形）中观察到某些尾鳍变形图案。在这里考虑的四种不同的刚度分布（均匀，拔罐，W形和异种）中，我们发现拔罐分配需要最小的电力消耗。另一方面，均匀分布在推力生成和效率方面表现最佳。本身的均匀刚度分布也导致“拔罐”变形模式，各种光线之间的相差相对较小。本型号为未来的骨架增强膜的动态铺平了道路。

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