title: Effects of stiffness distribution and spanwise deformation on the dynamics of a ray-supported caudal fin.
abstract: Using a fluid-structure interaction model, we study the effect of ray stiffness distribution on the deformation and performance of a caudal fin. By prescribing a simple swaying motion, our results show that through passive structural deformation alone it is possible to reproduce some complicated fin movements (e.g. the cup and 'W'-shape deformations) observed in real fish. Moreover, it has been numerically shown that, compared with a fin with uniform ray stiffness, at the same (average) ray stiffness fins with nonuniform stiffness distribution may achieve further performance enhancement, e.g. increase in propulsion efficiency and decrease in lateral force generation. This is attributed to spanwise deformations caused by phase differences between different rays.
authors.affiliation: Department of Structural Engineering, University of California, San Diego, La Jolla, CA 92093, United States of America.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhu
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Bi
mesh_terms: D058500:Animal Fins / Q000033:anatomy & histology* / Q000502:physiology*; D000818:Animals; D001696:Biomechanical Phenomena; D040761:Biomimetic Materials; D005399:Fishes / Q000033:anatomy & histology* / Q000502:physiology*; D006244:Hardness / Q000502:physiology*; D009068:Movement; D013550:Swimming / Q000502:physiology*