Length effects of a built-in flapping flat plate on the flow over a traveling wavy foil.
Length effects of a built-in flapping flat plate on the flow over a traveling wavy foil.
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DOI：
10.1103/physreve.89.063019
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发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
Nansheng Liu;Yan Peng;Xi-yun Lu
中科院分区：
文献类型：
--
作者：
Nansheng Liu;Yan Peng;Xi-yun Lu
采用多弛豫时间格子玻尔兹曼法和浸入边界法对后缘内置刚性襟翼板的行进波状水翼上的流动进行了数值研究。研究了板长度对推力、能耗和螺旋桨效率等推进性能的影响。已经确定了与不同的流体动力学和流动结构相关的三种模式（主体力主导、主体和尾部力竞争以及尾部力主导模式）。结果表明，存在一个性能较好的板长区域，在该区域内，由于推进力的大幅增加而以能耗略有增加为代价，实现了较高的螺旋桨效率（接近其最大值）。此外，阻力和侧向力的均方根（rms）值略有下降，表明对运动的稳定作用较弱。
Flow over the traveling wavy foil with a built-in rigid flapping plate at its trailing edge has been numerically studied using the multi-relaxation-time lattice Boltzmann method and immersed boundary method. The effect of the plate length on the propulsive performance such as the thrust force, energy consumption, and propeller efficiency has been investigated. Three modes (body force dominated, body and tail force competing and tail force dominated modes) have been identified that are associated with different hydrodynamics and flow structures. It is revealed that there exists a better performance plate length region and, within this region, a high propeller efficiency (close to its maximum value) is achieved due to a great increase in propulsive force at a cost of a slight increase in energy consumption. Furthermore, a weak stabilizing effect on locomotion movement is indicated by the slight decrease in the root-mean-square (rms) values of drag and lateral forces.