Flow-Induced Motion and Energy Conversion of the Cir-T-Att Oscillator in a Flow Field with a High Reynolds Number

Round 1

Reviewer 1 Report

Harvesting marine energy in turbulent regimes can be challenging for oscillator systems due to the unpredictable and chaotic nature of the flow. Turbulence in the marine environment can cause large fluctuations in water velocity, pressure, and direction, which can lead to difficulties in maintaining the stability and efficiency of the energy harvesting system.

One of the main challenges of the authors is the setting of the oscillating system. In order to efficiently harvest energy from turbulent flows, the system needs to be able to adapt to changing flow conditions and respond quickly to fluctuations in flow velocity and direction. This requires the use of advanced control systems that can adjust the system's oscillation frequency and amplitude in real-time.

The paper is well structured and has a complete study on a marine energy harvesting system based on the magnetic effect.

Questions:

Why did the authors choose the characteristic width of the oscillator D to vary the number of Reynolds and not another parameter of the system?  The authors must justify the choices.

Authors should enlarge part 2 of figure 3 and show the difference between the 6 systems (D/m).

The authors must justify the choice of material of the studied system.

The frequencies chosen in the study I see them too exaggerated. Can we find that in the case of a reel system integration in the ocean?

Authors should add the uses of the energy produced by the system.

 

Author Response

Please see the attachment

Author Response File: Author Response.pdf

Reviewer 2 Report

The paper investigates the effects of a high Reynolds number on the Flow-induced motion and energy conversion of the Cir-T-Att oscillator. Experiments were conducted in six Reynolds number ranges, and the system total damping ratio was adjusted by varying excitation voltages with a controllable magnetic damping system. The results showed that the Reynolds number affects both amplitude and global response characteristics, and the active power increases with increasing Reynolds number within the upper branch. The maximum power output of the Cir-T-Att oscillator reached 10.43 W and the maximum upper limit of power output was 17.80 W. Reviewer feels that the overall paper is structured reasonably, references are cited correctly, experiment results are presented, and conclusions are consistent with the evidence and arguments. 

However, reviewer feels few points must be addressed in the revised manuscript.

 

1. The novelty and contribution of the work should have been highlighted better. Authors can summarize key results in a table and compare them with the literature to achieve this.
2. The scalability of the Cir-T-Att oscillator to larger sizes and flow conditions should be investigated to evaluate its commercial potential.
3. A analysis of the noise and vibrations generated by the Cir-T-Att oscillator is needed, and methods to reduce them should be explored.
4. MDPI style should be used for citing references.

Author Response

Please see the attachment

Author Response File: Author Response.pdf