An Open-Source Code for High-Speed Non-Equilibrium Gas–Solid Flows in OpenFOAM
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsThis is a fundamental study investigating gas-solid flow using the Eulerian-Lagrangian approach. MPPIC was used to solve the discrete phase, while for the continuous phase, a density-based solver was utilized. Overall, I found the work interesting and it can be published after addressing a few comments. My comments/suggestions are as follows
1. In the introduction, please reference recent coupled Euler-Lagrange articles with newer version of MPPIC .
2. In section “2.3. Governing equations of discrete phase,” revise the equations for the discrete phase, as they appear to pertain to the DEM method rather than the MPPIC method. For the correct equations, refer to:
https://doi.org/10.1016/j.apt.2023.104235
3. Please include units on the horizontal axis of Figure 8.
4. Also, include units for Figure 9. If they're unitless, represent them as “x/L (-).”
5. On page 12, lines 244 and 245, where the Harris and Crighton model is referenced, report the values for the restitution and friction coefficients.
6. The proposed link in the “Data Availability Statement” section is not functional.
Comments on the Quality of English LanguageMinor editing of English language required.
Author Response
1. In the introduction, please reference recent coupled Euler-Lagrange articles with newer version of MPPIC .
Answer:Done.
2. In section “2.3. Governing equations of discrete phase,” revise the equations for the discrete phase, as they appear to pertain to the DEM method rather than the MPPIC method. For the correct equations, refer to:
https://doi.org/10.1016/j.apt.2023.104235
Answer:The Liouville equation has been added in the discription of the MPPIC method.
3. Please include units on the horizontal axis of Figure 8.
Answer:Done.
4. Also, include units for Figure 9. If they're unitless, represent them as “x/L (-).”
Answer:Done.
5. On page 12, lines 244 and 245, where the Harris and Crighton model is referenced, report the values for the restitution and friction coefficients.
Answer:Added in blue words.
6. The proposed link in the “Data Availability Statement” section is not functional.
Answer: The code is now available.
Reviewer 2 Report
Comments and Suggestions for AuthorsThe reviewed paper presents an open-source code for high-speed non-equilibrium multiphase flows in OpenFOAM. The authors presented a new solver and documented verification test cases. The results and discussion sections were written well, and enough evidence supported the findings. However, some points should be addressed before publication:
1- The introduction is a pivotal part of the paper, serving as the gateway to the entire work. I would suggest that the authors revise it to clearly outline the gap and goals of their research. In particular, the novelty of their work should be highlighted, as it is the first impression readers will have. This is a crucial step in ensuring the impact and significance of their work on the academic community.
2- I found some abbreviations in the main text without definitions. Please check them and make sure that they are described right away after they are introduced.
3- I would strongly recommend that the authors include a nomenclature section, listing all the symbols, letters, and operators used in the paper. This will greatly assist readers in understanding the equations and following the authors' line of thought. By doing so, the authors will facilitate a smoother reading experience for their audience, thereby enhancing the accessibility of their work.
4- In section 2.3, it is crucial that the authors explicitly state why the assumptions made in lines 94 to 101 are valid. This will ensure the scientific rigor of their work and enhance the credibility of their findings.
5- On page 6, lines 138-140, Ma_p was mentioned for the first time without the definition
6- Equation 19, below this equation, please describe T and T_p.
7- On page 5, lines 110-112, F_G should be the gravitational and buoyancy force
8- Since the developed solver is "Open-Source," it is highly recommended that it is accessible via the "https://github.com/caozq-China/hy2LPTFoamk." Unfortunately, the code cannot be accessed via the reported link, meaning that readers cannot verify and check it.
Author Response
1- The introduction is a pivotal part of the paper, serving as the gateway to the entire work. I would suggest that the authors revise it to clearly outline the gap and goals of their research. In particular, the novelty of their work should be highlighted, as it is the first impression readers will have. This is a crucial step in ensuring the impact and significance of their work on the academic community.
Answer: The introduction has been amended. A paragraph mentioned that an non-equilibrium high-speed gas-particle flow solver is less common. The existing codes are inhouse codes with limited accessibility to the public and they are developed on an uneven level and lack integration of the models. The goal of this work is to develop an open-source code and integrate multiple particles models to cover a wide range of flow conditions.
2- I found some abbreviations in the main text without definitions. Please check them and make sure that they are described right away after they are introduced.
Answer:We added a list of abbreviations and described them in the main text.
3- I would strongly recommend that the authors include a nomenclature section, listing all the symbols, letters, and operators used in the paper. This will greatly assist readers in understanding the equations and following the authors' line of thought. By doing so, the authors will facilitate a smoother reading experience for their audience, thereby enhancing the accessibility of their work.
Answer:Added.
4- In section 2.3, it is crucial that the authors explicitly state why the assumptions made in lines 94 to 101 are valid. This will ensure the scientific rigor of their work and enhance the credibility of their findings.
Answer: Added some explanations and the main purpose of these assumptions are to simplify the calculations.
5- On page 6, lines 138-140, Ma_p was mentioned for the first time without the definition
Answer:Definition added.
6- Equation 19, below this equation, please describe T and T_p.
Answer:Done
7- On page 5, lines 110-112, F_G should be the gravitational and buoyancy force
Answer:Corrected.
8- Since the developed solver is "Open-Source," it is highly recommended that it is accessible via the "https://github.com/caozq-China/hy2LPTFoamk." Unfortunately, the code cannot be accessed via the reported link, meaning that readers cannot verify and check it.
Answer: The code is now available.
