Shock Initiation of a Satellite Tank under Debris Hypervelocity Impact
Round 1
Reviewer 1 Report
I appreciate the authors’ using units consistent with those in the references they are citing. The authors should check with the requirements of the journal to see if this meets the journal’s standards, or whether they should present that information in units specified by the journal, regardless of the units used in the original reference. Grammar, capitalization, etc. needs a little work – please ask that your final version, if the paper is ultimately accepted for publication, be reviewed by someone well-versed in English syntax and grammar. Figure 1 is confusing. The way it is presented, it appears to be a closed loop. Perhaps it should be re-cast using a more appropriate flow-chart schema. In Fig (2a) and in Eq (12), what is upo? Is it ever used again? Pressure continuity is represented by Eq (11) and that makes sense. But what does Eq (12) represent? Please describe that boundary condition, as it appears to be an important one and is used again later in Eq (17). What is the purpose of the development in Eqs (5-12)? What are you solving for? Why don’t you solve for it then? Same question for Eqs (13-17) … what is the purpose of all that? What are the knowns? What are the unknowns? Why don’t you solve for the unknowns, whatever they are? In lines 157-158 you say that up is the velocity of the debris particle when it is at the rear surface of the tank wall. However, in line 165 and in Eq (19) it appears that up is the projectile velocity … so which is it? It seems like you are going to use Eq (24) to solve for something, but you do not. Why not? Why don’t you simplify Eq (25) using Eq (24)? “Equation (5) ~ equation (25) constitute the initiation criterion for the liquid hydrazine tank under hypervelocity impact.” Please provide a step-by-step example of how it all flows and fits together. Is that what Section 3.4 is for? If so, please expand it to show the calculations. If that’s not what it is for, then what is the purpose of Section 3.4? Please explain. What is the source of the parameters in Table 3? Section 4.3 might be another place where Eqs (5-25) are used. If so, please provide details in logical order. A flowchart of how the calculation process proceeds would be useful to future readers. At the end of Section 4.3 we read, “The calculation results of initiation criterion agree well with simulation results.” Please provide comparison tables or charts. By how much do they differ?Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This is an interesting paper. It investigates the numerical prediction of debris hypervelocity impact on a satellite tank by using 1D and CFD models. However, there are some important questions need to be answered before publishing the paper.
Can you give some detailed descriptions of the turbulence model you applied and why? Mesh generation: Figures 4 and 7 show the numerical girds but didn’t give the description for the grid. Can you show the size of the grids? Also, can you demonstrate that your results are independent of grids? In other word, since part of this study is the CFD modeling, the grid-independent tests should be provided to complete the CFD modeling procedures. Can you show the boundary conditions for the ANSYS/LS-DYNA model? I recommend using a Table to summarize boundary conditions which can make the content easier to read and to reproduce the simulation results.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The authors are to be congratulated on a much improved paper. A final request: please insert, in line 208, right before the first mention of TDL, the phrase, "This value was obtained using the process in Figure 4 as follows:" Then insert the information in Eqns (1) - (18) from your reviewer response document to help future readers more clearly understand the process and to perform their own calculations.
Author Response
Point 1: A final request: please insert, in line 208, right before the first mention of TDL, the phrase, "This value was obtained using the process in Figure 4 as follows:" Then insert the information in Eq (1) - (18) from your reviewer response document to help future readers more clearly understand the process and to perform their own calculations.
Response 1: We feel lucky that our manuscript went to you as the valuable comments help us with the improvement of our manuscript. Thank you very much for your valuable suggestion. We have inserted the phrase “This value was obtained using the process in Figure 4 as follows:” in line 207. Equation(27)～Equation(44) are added to show the calculation process. The modifications are marked in red in the revised manuscript.
Reviewer 2 Report
No further comment.
Author Response
We feel lucky that our manuscript went to you as the valuable comments help us with the improvement of our manuscript. Thank you very much for your valuable comments.
