Time-Domain Implementation and Analyses of Multi-Motion Modes of Floating Structures
, Evdokia Tapoglou 2,†, Xiandong Ma 1, C. James Taylor 1, Robert Dorrell 2, Daniel R. Parsons 2 and George Aggidis 1,*Round 1
Reviewer 1 Report
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Comments for author File: 
Comments.pdf
Author Response
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Author Response File: Author Response.pdf
Reviewer 2 Report
The manuscript presents a systematic introduction on how to implement the time domain analysis for floating structures, including the parameter transformations from frequency domain to time domain; methods for approximating the impulse functions and fluid memory effects; the coupling terms among the different motion modes, and the correctness of the time domain equation implementation. The topic of the paper is interesting and within the scope of the journal. The paper is well structured. it can be considered to accept in case of the authors can fulfill the minor revision suggested as follows:
- (L221, P.6) “300vs.3×106”
- (L236-237, P.6). It is better to give an explanation why the differences at the irregular frequencies in the short waves.
- (P.14) The meaning of IRF and approx In the Fig.10 should be illustrated.
- (L655,P.21) Where is the section 0.
- (L670-671,P.21) The explanation of ‘TD’ and ‘FD’ should be given when they first appear in the Fig.15.
Author Response
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Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The Authors replied to some of my previous concerns and the paper has improved. I have further comments that should be clarified
- The Authors should discuss the physical meaning of the negative added mass shown in figure 3b. The reply to my previous comment 8 is still unclear and incomplete.
- Regarding the maxima shown in Figure 6, I would suggest to evaluate the eigenfrequencies of the firsts natural modes. This might explain why maxima are located around 7 seconds.
- The reply to my former comment 10 is still unclear. The Authors claim that a maximum exists but the figure is still the same. Please demonstrate that a maximum exists.
- Reply to my comment 21. Again, second order effects are due to nonlinearities. This model is linear, so please avoid the wrong usage of terms such as "second order".
- line 923 and 925. These references have typos. Please correct.
- Reply to my comment 18. "the result shows the
low frequency response". Where is it shown? I can't see any oscillatory behaviour from 17a but only a monotonic growth. The behaviour looks like a steady drift, but the theory is linear. Please allow me to say that this is very strange. If you claim that this is harmonic motion characterised by small frequency you should demonstrate that the body returns back to its position even at large times. - Reply to my comment 19. A reply such as "we think this is an issue that needs a further investigation" is not enough. This must be clarified here, in this paper. Is it due to linear waves in presence of large body displacements? Or is it due to numerical issues? This is crucial and an explanation is needed here. At this point I strongly recommend a comparison against published works to validate this model.
To conclude, some replies are still not clear and need further explanations. There are some crucial points which might determine the correctness of the presented model, therefore validation against published works is strongly recommended.
The Authors should clarify the comments above, otherwise the paper cannot be accepted at this stage. I suggest another stage of thorough revision.
Author Response
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Author Response File: Author Response.pdf
Round 3
Reviewer 1 Report
References at line 915 and 917 have typos. "Mechele" should be "Michele". Whereas "S, M., et al", should be "Michele, S., et al."
Reference at line 970 should include the book "linear aspect" as well
