Evaluation of the Aerodynamic Effect of a Smooth Rounded Roof on Crosswind Stability of a Train by Wind Tunnel Tests
Round 1
Reviewer 1 Report
In this paper, aerodynamic force and pressure coefficients measured in wind tunnel tests on a scaled model of ETR1000 high-speed train on single track ballast and rails are presented. Force and pressure aerodynamic coefficients have been measured by a dynamometric balance and 160 pressure taps. The paper is well presented. Two minor issues are:
1. The picture quality is advised to be improved;
2. The marshalling length may have a slight effect on the results. The reference (Influence of marshalling length on aerodynamic characteristics of urban EMUs under crosswind. Journal of Applied Fluid Mechanics) is worthy to be added in the revision.
Author Response
Dear Reviewer,
We would like to thank you for the revision of the paper. In attached you can find the reply to the comments.
Kind Regards,
Carlos Esteban Araya Reyes
Elia Brambilla
Gisella Tomasini
Author Response File: 
Author Response.docx
Reviewer 2 Report
In the abstract, it is necessary to specify how to consider the combination of train speed and crosswind using one sentence. This is the motivation raised in the abstract, and the solution should be given afterwards.
The full name of GVPM should be given at its first appearance.
In the introduction, it is necessary to enrich the literature review by including the effect of crosswinds on other rail infrastructures, such as [1-2].
[1] "Wind deflection analysis of railway catenary under crosswind based on nonlinear finite element model and wind tunnel test." Mechanism and Machine Theory 168 (2022): 104608.
[2] "Advances in wind tunnel experimental investigations of train–bridge systems." Tunnelling and Underground Space Technology 118 (2021): 104157.
The last two paragraphs in the introduction are recommended to be combined, as they are talking about the same thing.
How to couple the effects from both the train speed and the crosswind? Please specify in Section 2.
Please unify the expressions of Cross wind and Crosswind.
The conclusions are a bit too long. Some findings can be more concise as they have already been presented.
Author Response
Dear Reviewer,
We would like to thank you for the revision of the paper. In attached you can find the reply to the comments.
Kind Regards,
Carlos Esteban Araya Reyes
Elia Brambilla
Gisella Tomasini
Author Response File: Author Response.docx
Reviewer 3 Report
The paper presented a wind tunnel test on high-speed trains, the pressure coefficients and pressure around the train are obtained which is meaningful for engineering applications. There are some concerns to make the research easily understood:
1. In the experiment set up, “the high-speed and low-turbulence test section of the wind tunnel facility was used.”, what do you mean low-turbulence test section, please list the parameters for this section as well.
2. The turbulence intensity is less than 0.1% which is small, how do you control the turbulence intensity during the experiment? Did you record the turbulence intensities at each wind speed?
3. The scale for car model is 1:15, any consideration on that?
Author Response
Dear Reviewer,
We would like to thank you for the revision of the paper. In attached you can find the reply to the comments.
Kind Regards,
Carlos Esteban Araya Reyes
Elia Brambilla
Gisella Tomasini
Author Response File: Author Response.docx
Round 2
Reviewer 2 Report
All my comments have been addressed.
