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Interaction between a flexible filament and a downstream rigid body.

Fang-Bao Tian¹, Haoxiang Luo, Luoding Zhu

¹Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui 230026, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|September 28, 2010

Summary

A flexible filament in the wake of a rigid body experiences reduced drag, despite potentially larger vibrations. This hydrodynamic interaction benefits the trailing rigid body, offering insights into aquatic animal movement near structures.

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Area of Science:

Fluid Dynamics
Hydrodynamics
Biomimetics

Background:

Understanding hydrodynamic interactions is crucial for analyzing fluid-structure dynamics.
Tandem arrangements of rigid and flexible bodies present complex flow phenomena.
Aquatic locomotion and biofouling near structures involve similar wake interactions.

Purpose of the Study:

To investigate the hydrodynamic interaction between a flexible filament and a rigid body in tandem.
To analyze the motion of the filament and compute drag forces on both bodies.
To explore the influence of gap distance and Reynolds number on this interaction.

Main Methods:

Numerical simulations were employed to model the fluid-structure interaction.
Experimental methods were utilized to validate numerical findings.
Drag forces and vibration amplitudes were quantitatively measured.

Main Results:

The gap between bodies and Reynolds number significantly influence the interaction dynamics.
The flexible filament exhibited increased vibration amplitude but reduced drag.
The trailing rigid body experienced notable drag reduction.
Filament length, mass ratio, and rigid body shape had minimal impact on qualitative behavior.

Conclusions:

The study reveals a unique drag reduction mechanism in rigid-flexible tandem arrangements.
Findings contrast with interactions involving two rigid or two flexible bodies.
The results provide valuable insights for understanding aquatic animal behavior in complex flow environments.