PONE-D-24-12338Research on hydrodynamic performance of S-type Turbine based on linear wavePLOS ONE

Dear Dr. Wang,

Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process.

1. A lot of literature is available on the subject. Author should discuss the finding of the earlier research and also discuss the limitations of those studies. The literature study can be enhanced by adding recent relevant references. Literature review should be improved and table should also be included which provide summary about the relevant previous research. Also, make the current literature review well structured.
2. How you define the domain size? Will the wall disturb the flow?
3. How you justify the value of y+ between 60 and 144? Is there any wall function?
4. Rewrite section 3.2 in technical manners. Only mentioning the number of nodes/elements are not sufficient. Also explain the CFL value for this case
5. Quality of the results/graphs are not upto the mark. This should be improved.
6. Novelty, choice of numerical model and meshing details are not explained well.

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We look forward to receiving your revised manuscript.

Kind regards,

Niaz Bahadur Khan, PhD

Academic Editor

PLOS ONE

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Additional Editor Comments:

1. A lot of literature is available on the subject. Author should discuss the finding of the earlier research and also discuss the limitations of those studies. The literature study can be enhanced by adding recent relevant references. Literature review should be improved and table should also be included which provide summary about the relevant previous research. Also, make the current literature review well structured.

2. How you define the domain size? Will the wall disturb the flow?

3. How you justify the value of y+ between 60 and 144? Is there any wall function?

4. Rewrite section 3.2 in technical manners. Only mentioning the number of nodes/elements are not sufficient. Also explain the CFL value for this case

5. Quality of the results/graphs are not upto the mark. This should be improved.

6. Novelty, choice of numerical model and meshing details are not explained well.

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Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

1. Is the manuscript technically sound, and do the data support the conclusions?

The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented.

Reviewer #1: Yes

Reviewer #2: Yes

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2. Has the statistical analysis been performed appropriately and rigorously?

Reviewer #1: Yes

Reviewer #2: Yes

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3. Have the authors made all data underlying the findings in their manuscript fully available?

The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified.

Reviewer #1: Yes

Reviewer #2: Yes

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4. Is the manuscript presented in an intelligible fashion and written in standard English?

PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here.

Reviewer #1: Yes

Reviewer #2: Yes

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5. Review Comments to the Author

Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters)

Reviewer #1: Presented paper investigated the hydrodynamic performance of a Savonius type turbine (S-type turbine) in a wave field.

The method of combining numerical simulation with physical experiment is adopted. Based on linear wave theory and turbulence model, Star CCM+ numerical simulation software is used for digital modelling, and overlapping grid technology is used for grid modelling.

The research results show that the S-type turbine must design a reasonable layout according to the wave field conditions.

Eq 4, how much is the moment of inertia of the turbine, I?

What is figure 5? it does not mean anything!

Table 3, what is TSR (Tip speed ratio)? or more detailed data of other related parameters? For example, U and inflow velocity or speed?

Fig 14 h is wave height, and wave period is T. In table 2 please show it.

Fig 17, obtain the average energy, how much for each case?

Fig 19, obtain the average values of the energy. omega is turbine angular velocity? Is that right?

Finally, compare the absorbed power for the forward and reverse turbine. Which one is better? What is the RPM? What is TSR? Add a table and show all average parameters of power, energy, etc corresponding to speed and TSR and some more else.

Reviewer #2: The work is presented on an interesting topic and fits the theme of PLOS ONE. There are several notes that authors need to take into account before publishing.

1. The background needs to be improved. In the analyzed works of other authors, the advantages and disadvantages of the reviewed studies should be presented. Based on the background results, it is necessary to clearly justify the choice of research tool. The goals and objectives of the study should be more clearly formulated.

2. Many questions on numerical modeling. There is no validation and verification process in your work. The choice of network is questionable, since the power factor is not a suitable value for determining the main parameters of turbine operation. The choice of the turbulence model is not justified in any way. No test results. There is no description of boundary conditions.

3. What is the error of the experimental data obtained?

How was it determined?

4. The design of the figures needs to be redesigned; the data curves should not fall on the numerical values ​​of the axes.

5. Conclusions should be concise and clear, contain specific quantitative data, all discussions should be after the figures.

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Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy.

Reviewer #1: Yes: Hassan Ghassemi

Reviewer #2: No

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Research on hydrodynamic performance of S-type Turbine based on linear wave

PONE-D-24-12338R1

Dear Dr. Wang,

We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements.

Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication.

An invoice will be generated when your article is formally accepted. Please note, if your institution has a publishing partnership with PLOS and your article meets the relevant criteria, all or part of your publication costs will be covered. Please make sure your user information is up-to-date by logging into Editorial Manager at Editorial Manager® and clicking the ‘Update My Information' link at the top of the page. If you have any questions relating to publication charges, please contact our Author Billing department directly at authorbilling@plos.org.

If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org.

Kind regards,

Niaz Bahadur Khan, PhD

Academic Editor

PLOS ONE

Additional Editor Comments (optional):

Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

1. If the authors have adequately addressed your comments raised in a previous round of review and you feel that this manuscript is now acceptable for publication, you may indicate that here to bypass the “Comments to the Author” section, enter your conflict of interest statement in the “Confidential to Editor” section, and submit your "Accept" recommendation.

Reviewer #1: All comments have been addressed

Reviewer #2: All comments have been addressed

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2. Is the manuscript technically sound, and do the data support the conclusions?

The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented.

Reviewer #1: Partly

Reviewer #2: Yes

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3. Has the statistical analysis been performed appropriately and rigorously?

Reviewer #1: Yes

Reviewer #2: Yes

**********

4. Have the authors made all data underlying the findings in their manuscript fully available?

The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified.

Reviewer #1: Yes

Reviewer #2: Yes

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5. Is the manuscript presented in an intelligible fashion and written in standard English?

PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here.

Reviewer #1: Yes

Reviewer #2: Yes

**********

6. Review Comments to the Author

Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters)

Reviewer #1: This is good topic and good paper. It is revised well and can be accepted. In some cases, there are some questionable but it is not important.

Reviewer #2: The explanations and changes made by the authors to the work dispelled some of my misconceptions. The article looks like an organic finished product for publication.

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7. PLOS authors have the option to publish the peer review history of their article (what does this mean?). If published, this will include your full peer review and any attached files.

If you choose “no”, your identity will remain anonymous but your review may still be made public.

Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy.

Reviewer #1: Yes: Hassan Ghassemi

Reviewer #2: No

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