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Hydrodynamics of a twisting slender swimmer.
Royal Society Open Science ( IF 3.5 ) Pub Date : 2020-08-05 , DOI: 10.1098/rsos.200754
Gil Iosilevskii 1 , Alexander Rashkovsky 1
Affiliation  

Sea snakes propel themselves by lateral deformation waves moving backwards along their bodies faster than they swim. In contrast to typical anguilliform swimmers, however, their swimming is characterized by exaggerated torsional waves that lead the lateral ones. The effect of torsional waves on hydrodynamic forces generated by an anguilliform swimmer is the subject matter of this study. The forces, and the power needed to sustain them, are found analytically using the framework of the slender (elongated) body theory. It is shown that combinations of torsional waves and angle of attack can generate both thrust and lift, whereas combinations of torsional and lateral waves can generate lift of the same magnitude as thrust. Generation of lift comes at a price of increasing tail amplitude, but otherwise carries practically no energetic penalty.



中文翻译:

扭曲的细长游泳者的流体力学。

海蛇通过侧向变形波推动自己前进,其变形速度比游泳快。然而,与典型的gu形游泳者相反,他们的游泳特征在于导致侧向波浪的夸张扭转波。扭转波对无角形游泳者产生的水动力的影响是本研究的主题。力和维持力所需的力,是通过细长(细长)身体理论的框架来分析地找到的。结果表明,扭转波和迎角的组合可以产生推力和升力,而扭转波和侧向波的组合可以产生与推力相​​同大小的升力。产生升力的代价是尾部振幅增加,但实际上几乎没有任何能量损失。

更新日期:2020-08-05
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