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Numerical Simulation on Self-Propulsion Characteristics of Bionic Flexible Foil Considering Ground Wall Effect
Yongcheng Li1,2, Nan Zhang1,2, Xinyuan Tang1,2
1Scientific Research Department of Hydrodynamics, China Ship Scientific Research Centre, Wuxi 214082, China.
Biomimetics (Basel, Switzerland)
|December 27, 2024
Summary
The ground wall effect enhances foil propulsion. Numerical simulations show that proximity to a wall improves a flexible foil's forward speed and propulsive efficiency, crucial for bionic underwater vehicle design.
Area of Science:
- Fluid dynamics
- Bionics
- Computational mechanics
Background:
- Understanding the propulsive mechanisms of bio-inspired underwater vehicles is crucial.
- The influence of proximity to surfaces (wall effect) on foil performance is not fully understood.
Purpose of the Study:
- To numerically investigate the wall effect on the propulsive performance of an auto-propelled flexible foil.
- To analyze the impact of varying wall distances on fluid dynamics and flow structures.
Main Methods:
- Utilized ANSYS Fluent for numerical evaluation of fluid dynamics.
- Employed a virtual model of a NACA0015 foil with traveling wavy motion (2D and 3D).
- Implemented dynamic and overlapping grid techniques for foil deformation and motion.
Main Results:
- The presence of a ground wall was found to be beneficial for foil propulsive properties.
- Forward speed increased by up to 13% and propulsive efficiency by 10.5% in the presence of the wall.
- Analysis included thrust force, lift force, propulsive efficiency, and flow structures.
Conclusions:
- The ground wall effect positively impacts foil propulsion.
- Findings are significant for the design optimization of bionic unmanned underwater vehicles (UUVs).
- Numerical simulations provide valuable insights into fluid-structure interaction near boundaries.
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