Study on Temperature Distribution Law of Tunnel Portal Section in Cold Region Considering Fluid–Structure Interaction
Round 1
Reviewer 1 Report
1、What is the unit of T in Formula(1.1)?
2、Please explain the respective meanings of equations (1.2) and (1.3).
3、The first/second/third boundary condition ?
4、“Through comparative analysis, there is a certain difference between the calculated value and the field measured value. The reason is that in the calculation of air velocity field, the coupling model ignores the influence of air resistance loss, dynamic pressure loss and local resistance loss on the flow field”. Please elaborate further. In my opinion, the differences in boundary conditions are causing those.（Fig.4.2）
5、(1.1)t-Time,S;(4.1)t-Time,d. Easily confused, please correct them.
Author Response
Response to reviewers
We appreciate the insightful and helpful review comments that have contributed to the quality of the paper. We respond as follows.
Response to reviewer #1:
- What is the unit of T in Formula (1.1)?
Response: Thank you for finding this mistake. The unit of T in Eq. (1.1) is degrees Celsius, which is an omission caused by an error on the part of the author and has been revised.
- Please explain the respective meanings of equations (1.2) and (1.3).
Response: Thanks for the suggestion. Formula introductions have been added before formulas (1.2) and (1.3), respectively.
- The first/second/third boundary condition?
Response: It is a very good question. The model "fluid-structure coupling finite element calculation model of tunnel in cold area" established in this paper focuses on lining-surrounding rock-air system in tunnel in cold area, and the boundary conditions of class 1/2/3 are all involved. A third type of boundary condition is used to analyze convective heat transfer between a fluid and a solid. The second type of boundary condition is used to analyze the heat transfer between lining-surrounding rock. The first type of boundary condition is used to analyze the contact between lining-surrounding rock surface and air.
- “Through comparative analysis, there is a certain difference between the calculated value and the field measured value. The reason is that in the calculation of air velocity field, the coupling model ignores the influence of air resistance loss, dynamic pressure loss and local resistance loss on the flow field”. Please elaborate further. In my opinion, the differences in boundary conditions are causing those.
Response: Thanks for the suggestion. The fluid-solid coupling model described in this paper includes the influence of three kinds of boundary conditions. In the air-lining-surrounding rock system, the third kind of boundary condition is used to calculate the air convection heat transfer. the surface layer of the lining-surrounding rock in contact with the air uses the first kind of boundary condition; and the lining-surrounding rock heat transfer between the solids uses the second kind of boundary condition. Therefore, there is a certain difference between the calculated value and the field measured value. The reason is that in the calculation of air velocity field, the coupling model ignores the influence of air resistance loss, dynamic pressure loss and local resistance loss on the flow field.
- (1.1)t-Time,S;(4.1)t-Time,d. Easily confused, please correct them.
Response: Thank you for finding this mistake. We have corrected these errors.
Reviewer 2 Report
Dear Editor/Authors
I have assessed the manuscript "Study on temperature distribution law of tunnel portal rock section in cold region considering fluid-structure interaction" for possible original article.
I would like to draw attention to the following points for a better study;
1) The cause-effect relation was not expressed in the article clearly. The subject and purpose of the article should be expressed, and the cause-effect relation should be revealed more clearly.
2) What is the difference between this study from other studies in the literature. Because there are lost of similar studies in the literature and please make a comparison. Write the similar/non similar points and emphasize your originality.
3) More information about the numerical and FEM studies should be given.
4) The introduction and literature review section should be improved. Bring along as much as you can the baseline scientific proof for the knowledge you are going to explore in further sections. The literature is better to be updated based on the most recent works.
5) The figures, tables, units and formulas should be more comprehensible.
6) The article should be controlled in terms of language, expression and grammar.
I believe that a more understandable article will be obtained when all these points are evaluated and added to the study. It is necessary to revise the article that I stated above and suggestions from other referees. I think that the paper needs revisions.
I wish success to the authors in their study.
Best regards
The article should be controlled in terms of language, expression and grammar.
Author Response
Response to reviewers
We appreciate the insightful and helpful review comments that have contributed to the quality of the paper. We respond as follows.
Response to reviewer #2:
I have assessed the manuscript "Study on temperature distribution law of tunnel portal rock section in cold region considering fluid-structure interaction" for possible original article. I would like to draw attention to the following points for a better study.
- The cause-effect relation was not expressed in the article clearly. The subject and purpose of the article should be expressed, and the cause-effect relation should be revealed more clearly.
Response: We appreciate the suggestion. According to the comments, we rearranged the structure of the article so that readers can understand the key points when reading, and the logical relationship is as follows: firstly, the core content of the article is divided into four parts (1-4), and the author integrated the theoretical part of the original Chapter 1 (1. Heat conduction control equations in cold-zone tunnels) and the theoretical part of the original Chapter 2 (2. Heat convection control equations in cold-zone tunnels) as a new chapter named "1. Basic theory of heat conduction and heat convection calculation in cold tunnels; the computational part of the original Chapter 2 (2. Control equations of air heat convection in cold tunnels) is taken as the new Chapter 2, named "Three-dimensional finite element solution of air heat convection model in cold tunnels"; The third chapter is renamed as "Numerical Solution of Heat Conduction-Heat Convection-Fluid-Solid Coupling Model in Cold Tunnels"; the fourth chapter is unchanged. In this way, the structure system of the whole paper is formed as "theory-calculation-application-analysis", which makes this paper’s structure is more reasonable.
- What is the difference between this study from other studies in the literature. Because there are lost of similar studies in the literature and please make a comparison. Write the similar/non similar points and emphasize your originality.
Response: Thanks for the suggestion. Combined with the problem, the author in the introduction part of the article around the theme of a number of related literature to reflect other researchers on the temperature field of cold tunnels related to the focus of previous research and the part of this paper; in the "0. Introduction" at the end of the third paragraph, the author briefly analyzes the focus of the current research and the direction of the previous research, and then At the end of the third paragraph of "0.Introduction", the author briefly analyzes the focus of current research and the direction of previous research, and then discusses the direction of the research in this paper in the industry there are vacancies, so as to lead to the research in this paper, and at the same time, facilitate the reader to understand the innovations in this paper. The innovations in this paper are briefly summarized as follows: when calculating the control equations of heat convection in tunnel air, the article extends the CBOS method for solving the N-S equations from one-dimensional to three-dimensional; moreover, since there is a certain degree of heat conduction in the surface layer of the lining in contact with the air in the process of tunnel lining-air heat exchange in addition to convective heat transfer, this paper couples heat conduction and heat convection and establishes a comprehensive and strong model of heat convection and heat conduction flow-solidity coupling. Therefore, this paper couples heat conduction and heat convection to establish a comprehensive heat convection-heat conduction flow-solidity coupling model.
- More information about the numerical and FEM studies should be given.
Response: It is a very good question. The research software used in this article is a non-commercial research program developed and mined by the team based on FEPG for secondary development, and as suggested, a description of the software used in the research has been added to the article.
- The introduction and literature review section should be improved. Bring along as much as you can the baseline scientific proof for the knowledge you are going to explore in further sections. The literature is better to be updated based on the most recent works.
Response: We appreciate the suggestion. The introduction of this paper is indeed lacking, and the author has updated the introduction. In the selection of literature, we firstly consider its relevance and timeliness, and modify and improve it based on the relevant research in recent years, mainly describing the research associated with this paper, so as to reflect the progress of the research related to the "temperature field in cold tunnels" and the contribution made by this paper.
- The figures, tables, units and formulas should be more comprehensible.
Response: According to the comments, the clarity of Figures 4.2-4.11 has been improved to make it easier to read the pictures; a textual narration has been added before equations (1.2) and (1.3) to improve the reading consistency; the article lacks the unit of T in equation (1.1), which has been added by authors.
- The article should be controlled in terms of language, expression and grammar.
Response: Thank you for finding this mistake. We have carefully revised the grammar and language expression of the paper.
- I believe that a more understandable article will be obtained when all these points are evaluated and added to the study. It is necessary to revise the article that I stated above and suggestions from other referees. I think that the paper needs revisions. I wish success to the authors in their study.
Response: Thanks for your insightful and helpful review comments.
