Effect of Turbulence Intensity on Aerodynamic Loads of Floating Wind Turbine under Wind–Wave Coupling Effect

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

A number of figures in the text are presented in a format that is difficult to read. In particular, Figures 3(A) and 5 do not give any idea of the information contained therein, due to the extremely poorly chosen scale. A variant of execution of these graphs with some resultant (approximating) function, which clearly displays the data, suggests itself. Similarly, in Figure 2, the information from the graph is difficult to read due to the poorly chosen scale.

For the study, only the nominal wind speed of 11.4 m/s was taken, and the processes affecting the installation occurring at other wind speed values were not considered. At the same time, the description of the characteristics of the NREL-5MW turbine indicates the threshold values of wind speed - 3.0 and 25.0 m/s.

For the simulation, strictly defined values of turbulence intensity and wave heights were taken, without clearly indicating whether they were threshold or the most common. For a more complete study, it is preferable to consider more than 4 configurations of the source data.

 In the simulation and calculation of wave loads, the values of the period of spectral peaks of 7.1 and 10.3 s were taken, without indicating why these values were adopted.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

This study first employs TurbSim and OpenFAST programs for secondary development to comprehensively model the NREL-5MW semi-submersible wind turbine and OC4-DeepC wind floating platform with wind-wave interaction. The authors demonstrated that in turbulent wind conditions, the aerodynamic power of the wind turbine and the root bending moments of the blades are significantly influenced by turbulence, while the impact of waves is minimal. Validation is conducted and the authors used several cases to analyze the impact of turbulence intensity in inflow wind and waves on the aerodynamic loads of floating wind turbines. Overall, the idea presented in the paper represents a sizable effort for designing and optimizing floating wind turbines in complex wind-wave coupling offshore environments. However, several aspects will need to be improved on this manuscript.

 

Introduction: the authors covered lots of studies on the structural dynamic response of floating wind turbines under the coupling of wind and waves. However, the limitations of those studies, or the improvements that the current work made should be discussed. It’s clear that the idea or the topic is different, but the applicability of different methodologies should also be discussed.

 

Introduction: OpenFAST should be referenced.

 

Introduction: The significance of this work needs to be stressed.

 

Section 3: Two different turbulence intensity levels were set at 5% and 20%. Can you explain why the two specific turbulence intensity levels were chosen for this study?

 

Section 3: An introduction to OpenFAST needs to be given here, at least on a high level. When it comes to the specific methods utilized by OpenFAST, a more in-depth description should be given, such as blade element momentum theory and Pierson-Moskowitz (P-M) spectrum, the difference between wave spectra and P-M.

 

Section 5.3: The color bar in Figure 7 is impossible to see. In fact, most of the figures in the manuscript are not clear.

 

Section 5.3: What are the numerical methods utilized to predict the wake region velocity distribution? A detailed description of that needs to be provided here.

 

 

 

 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Comments and Suggestions for Authors

The authors have addressed all my questions. I recommend accepting it in its current form.

Author Response

Thank you for carefully reviewing the article.