Liu Nansheng, Peng Yan, Lu Xiyun
Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Department of Mathematics & Statistics and Center for Computational Sciences, Old Dominion University, Norfolk, Virginia 23529, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Jun;89(6):063019. doi: 10.1103/PhysRevE.89.063019. Epub 2014 Jun 26.
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.
利用多松弛时间格子玻尔兹曼方法和浸入边界方法，对后缘带有内置刚性襟翼板的行进波浪箔上的流动进行了数值研究。研究了板长对推进性能（如推力、能量消耗和螺旋桨效率）的影响。已识别出三种模式（体力主导、体部和尾部力竞争以及尾部力主导模式），它们与不同的流体动力学和流动结构相关。结果表明，存在一个性能较好的板长区域，在该区域内，由于推进力大幅增加，而能量消耗略有增加，从而实现了较高的螺旋桨效率（接近其最大值）。此外，阻力和横向力的均方根（rms）值略有下降，表明对运动具有微弱的稳定作用。
