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Fractal-induced 2D flexible net undulation.

Michael Joon Seng Goh1, Yeong Shiong Chiew2, Ji Jinn Foo3

  • 1Mechanical Engineering Department, School of Engineering, Monash University Malaysia, Subang Jaya, Malaysia. michael.goh@monash.edu.

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Summary
This summary is machine-generated.

Flexible nets reveal turbulence strength. Fractal grids create stronger, more complex turbulence than regular grids, causing greater net deformation and excitation.

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Area of Science:

  • Fluid Dynamics
  • Turbulence Research
  • Experimental Mechanics

Background:

  • Turbulence generated by grids is crucial for understanding fluid flow phenomena.
  • Fractal grids offer unique, multi-length scale turbulence characteristics.
  • Flexible structures can potentially act as sensors for flow dynamics.

Purpose of the Study:

  • To investigate the deformation of a flexible net in fractal-induced turbulence.
  • To explore the net's response as a surrogate for measuring local turbulent strength.
  • To compare turbulence generated by square fractal grids (SFG) with regular-square-grids (RSG).

Main Methods:

  • Experimental analysis of a net's transient deformation in SFG-generated flow.
  • Measurement of root-mean-squared velocity fluctuations within the net.
  • 3D reconstruction of submerged nets to map turbulence across the channel cross-section.

Main Results:

  • Net deformation (undulations) directly correlates with local turbulent strength.
  • SFGs induce significantly higher fluctuation intensities in the net compared to RSGs.
  • The net exhibits up to 9x higher average excitation from SFGs versus RSGs of similar blockage ratio.

Conclusions:

  • Flexible nets can serve as effective experimental tools for characterizing turbulence.
  • SFGs generate more intense and complex turbulence than RSGs, leading to greater net excitation.
  • This study presents a novel method for contrasting turbulence from different grid types using net deformation.