Hydrodynamic effects of spines: A different spin
Hydrodynamic effects of spines: A different spin
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脊柱的流体动力学效应：不同的旋转
DOI：
10.1215/21573698-1303444
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发表时间：
2011
影响因子：
4.5
通讯作者：
L. Fauci
中科院分区：
文献类型：
--
作者：
H. Nguyen;L. Karp‐Boss;P. Jumars;L. Fauci
许多小型浮游生物都有刺，其中一些潜在的功能已经被探索过，例如，在重力沉降过程中增加阻力或防御捕食者。利用浸入式边界框架，我们进行了计算流体动力学模拟，研究了模型硅藻在不同棘数、长度和角度的剪切流中的旋转动力学。我们发现，通过将简单的椭球体运动理论应用到最小的椭球体上，可以准确地预测棘细胞的运动。最不适合的是少量或极端角度的刺，这使得大量的刻字球体没有被任何刺占据。虽然目前的工作提供了一种简单的方法来预测刚性的运动，脊椎细胞在剪切流动中，脊椎对营养交换的影响仍有待探索。
Many small planktonic organisms bear spines, some of whose potential functions have been explored, for example, in increasing drag during gravitational settling or in defense against predators. Using an immersed boundary framework, we performed computational fluid dynamic simulations that examine the rotational dynamics of model diatoms in shear flows with varying spine number, length, and angle. We found that the motion of spined cells could be accurately predicted from simple theory for motion of spheroids by applying that theory to the smallest spheroid that could inscribe the cell inclusive of its spines. The poorest fits were for small numbers or extreme angles of spines that left large volumes of the inscribing spheroid unoccupied by any spines. Although the present work provides a simple means of predicting motions of rigid, spined cells in shear flows, the effects of spines on nutrient exchange remain to be explored.