Reacting chemistry model for CO2-N2 about hystrath

[vincentcasseau]

Hi Akhil,

Thanks for creating a new issue (I deleted your first post).
The answer is given here: https://vincentcasseau.github.io/solvers-dsmcfoam/
under Ongoing or planned developments

Thanks,
Vincent

[akhil-yadav]

Thanks a lot, Sir, for such a quick response.

Would you please confirm the following?

1. Now, only N2-O2 chemical reaction is included in dsmcFoam+ ( including dissociation, exchange, and ionisation) that too with QK model only ( As I can see in src/lagrangian/dsmc/reactions). Please correct me if I was mistaken.
2. LBVHS collision model including both rotational and vibrational modes can be used for martian (CO2 -N2) atmosphere by changing in respective parameters in dsmcProperties.
3. How to implement vacuum boundary conditions at the outlet (mentioned in https://doi.org/10.1016/j.compfluid.2010.07.014 and https://doi.org/10.1016/j.cpc.2017.09.030) as far as tutorials vacuum boundary condition is not implementated.
4. dsmcFoam, as well as dsmcFoam+, gives fd ( force density) how to calculate drag force from it to evaluate Cd( drag coefficient).

Thank you

[vincentcasseau]

1. yes
2. yes
3. please check the How-tos. The vacuum BC is used in the tutos: dsmcDeletionPatch
4. fd is the force density in N/m², from which you can derive the total drag force and then the drag coefficient

[akhil-yadav]

Thank you Sir for the clarification

2. Regarding the LBVHS (The CO2 molecule has four vibrational modes with one symmetry stretching, one asymmetry stretching, and two bending modes. The vibrational characteristic temperatures for the four modes of CO2 are taken as 1997, 3380, 960, and 960 K- https://aip.scitation.org/doi/10.1063/1.5054194). How to simulate for molecules having multivibrational modes. which charactersticVibrationalTemperature to choose or multiple can be used as input.
3. How to implement vacuum boundary condition in dsmcFoam
4. Total drag force can be calculated (postprocessing) by integrating fd*surface normal then drag coefficient. Correct me if was mistaken.

Thank You