Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains When Entering Tunnel Under Crosswind

Round 1

Reviewer 1 Report

Interesting work.

The methodologies and equations were clearly explained. CFD work is done professionally and completely. There were some minor comments that you need to address. See the commented sections on the attached PDF.

Comments for author File: Comments.pdf

Author Response

    We acknowledge the careful review and comments / suggestions from the reviewers. Base on the comments, the manuscript has been revised accordingly, and the revised portion is marked in yellow in the revised manuscript. Following lists our detailed responses to the comments.

1. Add sentence ‘Through the grid sensitivity analysis described in Section 4.3.3, it is finally determined that the total number of model grid cells is 9.5 million and the number of boundary layers on the train surface is 8.’ at the end of the third paragraph of Section 4.1 in the revised manuscript.
2. Add sentence ‘Based on the fact that the Courant number in this study is less than or equal to 5, the physical time-step size of the CFD solution is determined to be 1×10^-3 s. Actually, the present time-step size value is smaller than that used in some similar studies’ at the end of the first paragraph of Section 4.2 in the revised manuscript.
3. In the Section 4.3.1 of the revised manuscript, a discussion on how to determine the value of the longitudinal segment number is added. The wording of Section 4.3.1 has also been comprehensively adjusted.
4. The Acknowledgement section is supplemented. In addition, the statement of conflict of interest was added.

Best regards,

E Deng

Author Response File: Author Response.doc

Reviewer 2 Report

Paper describes the influence of the aerodynamic loads on the train safty when entering tunnel under crosswind. 

The simulations are well described and the results are verified in the field test.

I think that the paper could be accepted  in the form as it is.

Author Response

We acknowledge the careful review and comments / suggestions from the reviewers. Base on the comments, the manuscript has been revised accordingly, and the revised portion is marked in yellow in the revised manuscript. Following lists our detailed responses to the comments.

1. Add sentence ‘Through the grid sensitivity analysis described in Section 4.3.3, it is finally determined that the total number of model grid cells is 9.5 million and the number of boundary layers on the train surface is 8.’ at the end of the third paragraph of Section 4.1 in the revised manuscript.
2. Add sentence ‘Based on the fact that the Courant number in this study is less than or equal to 5, the physical time-step size of the CFD solution is determined to be 1×10^-3 s. Actually, the present time-step size value is smaller than that used in some similar studies’ at the end of the first paragraph of Section 4.2 in the revised manuscript.
3. In the Section 4.3.1 of the revised manuscript, a discussion on how to determine the value of the longitudinal segment number is added. The wording of Section 4.3.1 has also been comprehensively adjusted.
4. The Acknowledgement section is supplemented. In addition, the statement of conflict of interest was added.

Best regards,

E Deng