C-start: optimal start of larval fish
C-start: optimal start of larval fish
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DOI：
10.1017/jfm.2011.558
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发表时间：
2012-05-10
影响因子：
3.7
通讯作者：
Koumoutsakos, P.
中科院分区：
文献类型：
--
作者：
Gazzola, M.;Van Rees, W. M.;Koumoutsakos, P.
我们调查的C-启动逃生响应的仔鱼结合使用重新网格涡方法与进化优化的流动模拟。我们测试的假设的C-启动的最优性的幼虫鱼的幼虫形，二维和三维的自推进游泳者的模拟。我们优化的游泳者在其初始回合中所走过的距离，根据实验观察到的幼虫中线曲率值的形状变形的边界。在这些界限内确定的最佳运动与体内实验吻合良好，并表明C-启动确实最大化逃逸距离。此外，我们发现，运动的曲率超出了实验观察到的仔鱼可能会导致更大的逃逸距离。我们分析的流场，并发现，C-开始逃生的有效性依赖于明显的C-弯曲的身体配置的能力，以捕获和加速大量的流体，这反过来又与大的加速度的游泳者。
We investigate the C-start escape response of larval fish by combining flow simulations using remeshed vortex methods with an evolutionary optimization. We test the hypothesis of the optimality of C-start of larval fish by simulations of larval-shaped, two- and three-dimensional self-propelled swimmers. We optimize for the distance travelled by the swimmer during its initial bout, bounding the shape deformation based on the larval mid-line curvature values observed experimentally. The best motions identified within these bounds are in good agreement with in vivo experiments and show that C-starts do indeed maximize escape distances. Furthermore we found that motions with curvatures beyond the ones experimentally observed for larval fish may result in even larger escape distances. We analyse the flow field and find that the effectiveness of the C-start escape relies on the ability of pronounced C-bent body configurations to trap and accelerate large volumes of fluid, which in turn correlates with large accelerations of the swimmer.