Numerical Analysis on Self-Propulsion of a Waterjet-Propelled Ship with Different Propulsion Models

Round 1

Reviewer 1 Report

The manuscript discusses the self-propulsion problem of ships with waterjet propulsion.

Introduction is excellent and covers the topic and its literature review very good. The model and the numerical technique (using ANSYS) are sufficiently clear with all the parameters.

Authors also explained the convergence details and the time consumed. Some comparison with experimental data are outlined.

Results are explained numerically and graphically in a good and clear form.

The conclusions are clear and concise.

 

There are some comments:

1- In section 2, it is more professional to write the body-force model UDF code as an algorithm instead of a direct code.

2- More recent references (2021 & 2022) may be added.

 

Author Response

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Author Response File: Author Response.docx

Reviewer 2 Report

Many references are very old, I suggest using more recent references in the article

1. ITTC 21st, 1996. Report of the waterjets group, appendix A. In: Proceedings of the 21st International Towing Tank Conference, 527 Bergen and Trondheim Norway. 528

2. ITTC 22nd, 1998. The specialist committee on waterjets final report and recommendations to the 22nd ITTC. 529

3. ITTC 23rd, 2002. The Specialist Committee On Validation of Waterjet Test Procedures. In: Proceedings 23rd international towing 530 tank conference, vol II, pp 387-415. 531

4. ITTC 24th, 2005. Report of the specialist committee on validation of waterjet test procedures. In: Proceedings of the 24th Inter- 532 national Towing Tank Conference. Edinburgh, UK. 533

5. ITTC 25th, 2008. The specialist committee on waterjets: final report and recommendations to the 25th ITTC. In: Proceedings of 534 25th ITTC. Fukuoka, Japan. 535

6. ITTC 26th, 2011. The propulsion committee: final report and recommendations to the 26th ITTC. In: Proceedings of 26th ITTC. 536 Rio de Janeiro, Brazil. 537

7. Coop, Hamish George, 1995. Investigation of Hull-Waterjet Interaction Effects. PhD Thesis. Department of Mechanical Engi- 538 neering, University of Canterbury. 539

8. Van Terwisga, Tom, 1996. Waterjet-Hull Interaction. PhD Thesis. Delft Technical University. 540

9. Bulten, Norbert Willem Herman, 2006. Numerical Analysis of a Waterjet Propulsion System. PhD Thesis. Eindhoven University 541 of Technology.

10. ...

Author Response

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Reviewer 3 Report

The authors compare numerical methods for modelling the rotational parts of a water jet engine. Results for the multiple reference frame model, sliding mesh model and an implemented body-force model are shown.

 

The description of the MRF in section 2.4 is not correct. The MRF does not only act on the interface. An additional correction term is applied on all surfaces where rotation is modelled.

I don't understand how B_a is determined. Idearly, you want to apply the same axial force as the propeller would do. But that axial force is not known apriori. Thus, B_a is just a rough estimate as well as the result of the hull resistance.

Please use a more explicit language. I don't understand what the authors mean by "which is based on secondary development".

Author Response

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Author Response File: Author Response.docx