Related Experiment Video
Updated: May 9, 2025

Flapping Soft Fin Deformation Modeling using Planar Laser-Induced Fluorescence Imaging
Published on: April 28, 2022
Underwater bionic undulating fins incorporating thickness effects: hydrodynamic performance and optimal thickness
Long Chen1, Qiao Hu1,2, Shijie Li1
1School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
Abstract:
In response to the urgent issues faced by current bionic undulating fin robot propulsion mechanisms, such as low working efficiency, insufficient swimming speed, ignoring thickness parameters, and the need for further improvement in biomimetic degree, this article extends the theory of surface elements to tetrahedral elements using d'Alembert's principle, making it better suited for the research of undulating fins with thickness. By employing computational fluid dynamics simulations and comparative studies, the article examines the influence of motion parameters on the hydrodynamic performance of undulating fins that have thickness. The results are more valuable for engineering applications. Further research on the dimensional parameters of undulating fins is carried out, proposing that the design of undulating fins should theoretically follow the priority order of 'width first, then length, and finally thickness'. Based on this, a bionic fin with variable thickness is designed, and the optimal range of comprehensive hydrodynamic performance for the variable thickness fin is obtained.
Related Concept Videos
Typical Model Studies
Thin-Walled Hollow Shafts
Fluid Pressure over Flat Plate of Constant Width
The resultant force...
Design Example: Deciding Thickness of Lubricating Fluid in a Shaft
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular...
General External Flow Characteristics
Modeling and Similitude

