Comparative experimental and simulation study on passive feeding flow generation in 'Cyrtospirifer'
Comparative experimental and simulation study on passive feeding flow generation in 'Cyrtospirifer'
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‘Cyrtospirifer’被动摄食流产生的对比实验与模拟研究
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
O. Kuwazuru
中科院分区：
文献类型：
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作者：
Y. Shiino;O. Kuwazuru
为了从被动摄食流的产生方面阐明螺旋藻腕足类翼型的功能特性，我们利用流动实验和中空的“Cyrtospirifer”模型的计算流体力学模拟，分析了该物种外壳周围的流动结构。模型中的所有被动流动都不可避免地表现出绕沟槽的旋转行为，而壳体内部的侧向空间则表现出相反的涡流方向，这可能是机翼形状效应的结果。因为在我们的实验中，在横向缝隙处间歇性地产生了外流，所以在模拟中它们被用来描述尾迹流的路径。考虑到我们的实验和模拟得到的可比较的结果，这种路径的产生显然与螺旋体翼型上的湍流条件有关。我们的结果表明，螺旋虫的翅膀形状在间歇性地通过侧向缝隙产生流入和流出的过程中起着作用，这使得产生高流速成为可能。
As a preliminary step in clarifying the functional properties of the wing form of spiriferide brachiopod 'Cyrtospirifer' in terms of the generation of passive feeding flows, the flow structure around the shell of this species was analysed using both flow experiments and a computational fluid dynamics simulation of a hollow 'Cyrtospirifer' model. All passive flows in the model inevitably showed a gyrating behaviour around the sulcus, whereas the lateral space inside the shell exhibited a reversed vortex flow direction, which possibly resulted from wing form effects. Because outflows were intermittently generated at the lateral gapes in our experiments, they were used to describe the path of the wake flows in the simulation. Given the comparable results obtained from both our experiments and the simulation, this path generation is clearly related to the turbulent conditions along the spiriferide wing form. Our results suggest that wing form in spiriferids plays a role in intermittently generating both inflows and outflows through lateral gapes, making it possible to produce a high flow rate.