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Hydrodynamic analysis of human swimming based on VOF method
Jie-Min Zhan1, Tian-Zeng Li1, Xue-Bin Chen1
1a Department of Applied Mechanics and Engineering , Sun Yat-sen University , Guangzhou , P.R. China.
Computer Methods in Biomechanics and Biomedical Engineering
|January 28, 2017
Summary
This study developed a numerical model to analyze swimmer drag, including wave resistance. Optimal streamlined gliding involves aligning the head with the body, with wave resistance being significant near the surface.
Area of Science:
- Fluid Dynamics
- Computational Mechanics
- Sports Science
Background:
- Hydrodynamic drag significantly impacts swimming performance.
- Wave-making resistance, a key component of drag, is complex to model.
- Understanding optimal body posture is crucial for efficient swimming.
Purpose of the Study:
- To establish a 3-D numerical model for simulating hydrodynamic drag on swimmers.
- To investigate the influence of wave-making resistance.
- To determine the effects of swimmer posture and depth on drag.
Main Methods:
- Utilized Navier-Stokes equations with RNG k-ε turbulence closure.
- Employed the Volume of Fluid (VOF) method for free surface simulation.
- Validated the model against experimental data from mannequin towing tests.
Main Results:
- The numerical model accurately predicted drag forces, showing good agreement with experimental data.
- Optimal streamlined gliding posture requires aligning the head with the body.
- Wave-making resistance was found to be substantial within 0.3 meters of the free surface.
Conclusions:
- The developed numerical model is a reliable tool for studying swimmer hydrodynamics.
- Head position is a critical factor in minimizing drag during streamlined gliding.
- Swimming depth significantly influences the impact of wave-making resistance on overall drag.
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