The essence of generating vortex-within-a-vortex structures behind forked caudal fins
Source abstract
Abstract
This work focuses on vortex-within-a-vortex (VV) structures behind three different shapes of forked caudal fin with a heaving-pitching motion. The results show that the synchronization of trailing-edge vortex separation and the shedding of the leading-edge vortex contributes to the generation of the VV structure. The VV structures of caudal fins with different chord lengths can be observed almost simultaneously. The Strouhal number not only determines the number of shedding vortices in the wake but also reflects the activation time and the superimposed effect of the leading-edge vortex and trailing-edge vortex on propulsion performance. This study provides an important theoretical reference for the design and control of fork propellers for use in underwater vehicles.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Biomimetic flight and propulsion mechanisms · Cavitation Phenomena in Pumps · Wind Energy Research and Development
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (26)
Show source-provided references
1. Comparison of the morphology, structures and mechanical properties of teleost fish scales collected from New Zealand10.1007/s42235-019-0028-1 ↗
2. The fish tail motion forms an attached leading edge vortex10.1098/rspb.2012.2071 ↗
3. Analysis of biomimetic caudal fin shapes for optimal propulsive efficiency10.1016/j.oceaneng.2018.01.082 ↗
4. Numerical simulations of the flow around a square pitching panel10.1016/j.jfluidstructs.2017.11.001 ↗
5. Effects of trailing edge shape on vortex formation by pitching panels of small aspect ratio10.1103/physrevfluids.4.033101 ↗
6. Effects of the shape of an inverted flag on its flapping dynamics10.1063/1.5079579 ↗
7. Effects of individual horizontal distance on the three-dimensional bionic flapping multi-wings in different schooling configurations10.1063/1.5087624 ↗
8. The effects of caudal fin deformation on the hydrodynamics of thunniform swimming under self-propulsion10.1007/s42241-020-0080-7 ↗
9. Impact of caudal fin shape on thrust production of a thunniform swimmer10.1007/s42235-020-0020-9 ↗
10. Effects of St and Re on propulsive performance of bionic oscillating caudal fin10.1016/j.oceaneng.2020.107933 ↗
11. Numerical study on the hydrodynamics of C-turn maneuvering of a tuna-like fish body under self-propulsion10.1016/j.jfluidstructs.2020.102954 ↗
12. Imaginative solutions by marine organisms for drag reduction
13. Effect of spanwise flexibility on flapping wing propulsion10.1016/j.jfluidstructs.2007.08.003 ↗
14. Aeroelastic response of a delta wing at High angles of attack
15. Study on the hydrodynamic performance of typical underwater bionic foils with spanwise flexibility10.3390/app7111120 ↗
16. Effect of torsional spring and shape on the performance of bioinspired caudal fin10.1063/5.0057138 ↗
17. Swimming in four goldfish (Carassius auratus) morphotypes: understanding functional design and performance through artificial selection10.1016/j.cbpa.2008.04.149 ↗
18. Robotic models for studying undulatory locomotion in fishes10.4031/mtsj.45.4.8 ↗
19. Numerical study of the thunniform mode of fish swimming with different Reynolds number and caudal fin shape10.1016/j.compfluid.2012.08.004 ↗
20. Development of a robotic fin for hydrodynamic propulsion and aerodynamic control
21. Body form, locomotion and foraging in aquatic vertebrates10.1093/icb/24.1.107 ↗
22. Biomechanics: Hydrodynamic function of the shark’s tail10.1038/430850a ↗
23. On the role of form and kinematics on the hydrodynamics of self-propelled body/caudal fin swimming10.1242/jeb.030932 ↗
24. Numerical study of propulsion mechanism for oscillating rigid and flexible tuna-tails10.1016/s1672-6529(11)60046-2 ↗
25. Numerical investigation on evolutionary characteristics of the leading-edge vortex induced by flapping caudal fin10.1063/1.5128701 ↗
26. An efficient swimming machine10.1038/scientificamerican0395-64 ↗