Disentangling the Relation Between the Planform Shape and Swimming Gait in Cetacean Propulsion
Disentangling the Relation Between the Planform Shape and Swimming Gait in Cetacean Propulsion
复制标题
解开鲸目动物推进中平面形状与游泳步态之间的关系
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
F. Fish
中科院分区：
文献类型：
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作者：
F. Ayancik;K. Moored;F. Fish
鲸目动物已经进化出了广泛的形态特征和游泳步态，这些特征和步态与增强的推力产生、高推进效率和减小的阻力有关。这些变化在他们的侥幸形状和游泳步态影响他们的生产力和游泳的能量需求。本研究的目的是解开在自航游泳的吸虫形状和游泳步态之间的关系。平面形状的参数化，通过使用NACA启发的功能，其中的系数是适合不同种类的鲸类。采用三维非定常边界元法，建立了具有虚拟阻力体的自航锚爪模型。通过互换形状和步态参数，推力，功率和效率游泳沿着与尾流结构的特点。它是确定的形状和步态的侥幸有相当大的影响后的拓扑结构，反过来斯特劳哈尔数。鲸目动物游泳的力的产生和功率消耗被发现遵循基于升力的推进的趋势，推进效率在75- 85%之间。研究还发现，体型和步态对游泳成绩的影响不是相互交织的，而是相互独立的。
Cetaceans have evolved a broad range of morphological characteristics and swimming gaits associated with enhanced thrust production, high propulsive efficiency, and reduced drag. These variations in their fluke shape and swimming gait influence their force production and energy requirements for swimming. The present study aims to disentangle the relation between the fluke shape and swimming gait in self-propelled swimming. Planform shapes are parametrized by using a NACA-inspired function where the coefficients are fit to different species of cetacea. An unsteady three-dimensional boundary element method is used to model the self-propelled flukes with a drag-producing virtual body. By interchanging the shape and gait parameters, the thrust, power, and efficiency of swimming along with the wake structures are characterized. It is determined that the shape and the gait of the fluke have a considerable influence on the wake topology and in turn the Strouhal number. The force production and power consumption of cetacean swimming is found to follow trends of lift-based propulsion with propulsive efficiencies ranging from 75–85%. It is also discovered that the effect of the shape and gait on the swimming performance are not intertwined and are in fact independent.