scholarly journals Kinematics of the ribbon fin in hovering and swimming of the electric ghost knifefish

2012 ◽  
Vol 216 (5) ◽  
pp. 823-834 ◽  
Author(s):  
R. Ruiz-Torres ◽  
O. M. Curet ◽  
G. V. Lauder ◽  
M. A. MacIver
Keyword(s):  
Ribbon Fin

scholarly journals The hydrodynamics of ribbon-fin propulsion during impulsive motion

2008 ◽  
Vol 211 (21) ◽  
pp. 3490-3503 ◽  
Author(s):  
A. A. Shirgaonkar ◽  
O. M. Curet ◽  
N. A. Patankar ◽  
M. A. MacIver
Keyword(s):  
Impulsive Motion ◽  
Ribbon Fin

Propulsive performance of an under-actuated robotic ribbon fin

2017 ◽  
Vol 12 (3) ◽  
pp. 036015 ◽  
Author(s):  
Hanlin Liu ◽  
Oscar M Curet
Keyword(s):  
Propulsive Performance ◽  
Ribbon Fin

Kinematics of ribbon-fin locomotion in the bowfin,Amia calva

2013 ◽  
Vol 319 (10) ◽  
pp. 569-583 ◽  
Author(s):  
Kevin Jagnandan ◽  
Christopher P. Sanford
Keyword(s):  
Amia Calva ◽  
Ribbon Fin

scholarly journals Beyond the Kármán gait: knifefish swimming in periodic and irregular vortex streets

2021 ◽  
pp. jeb.238808
Author(s):  
Victor M. Ortega-Jimenez ◽  
Christopher P. Sanford
Keyword(s):  
Vortex Shedding ◽  
Flow Speed ◽  
Laminar Flows ◽  
Oscillating Cylinder ◽  
Pectoral Fins ◽  
Left Behind ◽  
Moving Cylinder ◽  
Vortex Streets ◽  
Fixed Cylinder ◽  
Ribbon Fin

Neotropical freshwater fishes such as knifefishes are commonly faced with navigating intense and highly unsteady streams. However, our knowledge on locomotion in apteronotids comes from laminar flows, where the ribbon fin dominates over pectoral fins or body bending. Here, we studied the 3D kinematics and swimming control of seven black ghost knifefish (Apteronotus albifrons) moving in laminar flows (flow speed U∞∼1 – 5 Bl/s) and in periodic vortex streets (U∞∼2 – 4 Bl/s). Two different cylinders (∼2 and ∼3 cm diameter) were used to generate the latter. Additionally, fish were exposed to an irregular wake produced by a free oscillating cylinder (∼2 cm diameter; U∞∼2 Bl/s). In laminar flows knifefish mainly used their ribbon fin, with wave frequency, speed and acceleration increasing with U∞. In contrast, knifefish swimming behind a fixed cylinder increased the use of pectoral fins and resulted in changes in body orientation that mimicked steady backward swimming. Meanwhile, individuals behind the oscillating cylinder presented a combination of body bending, ribbon and pectoral fins movements that counteract the out-of-phase yaw oscillations induced by the irregular shedding of vortices. We corroborated passive out-of-phase oscillations by placing a printed knifefish model just downstream of the moving cylinder but, when placed one-cylinder diameter downstream, the model oscillated in phase. Thus, the wake left behind an oscillating body is more challenging than a periodic vortex shedding for an animal located downstream, which may have consequences on inter- and intra-specific interactions.

scholarly journals Kinematics of the ribbon fin in hovering and swimming of the electric ghost knifefish

2014 ◽  
Vol 217 (20) ◽  
pp. 3765-3766 ◽  
Author(s):  
R. Ruiz-Torres ◽  
O. M. Curet ◽  
G. V. Lauder ◽  
M. A. MacIver
Keyword(s):  
Ribbon Fin
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