Learning Forum

[Kobee]

Hello, Anys community,

I need help to simulate a fast filling hydrogen tank problem. I have found some papers published 

https://pdfs.semanticscholar.org/f20d/6e53fc1795ca4470731959f7558e7436c4d4.pdf

https://h2tools.org/sites/default/files/2019-08/Simulation%20of%20the%20Fast%20Filling%20of%20Hydrogen%20Tanks.pdf

https://www.sciencedirect.com/science/article/pii/S0360319916307078

I have read these papers but I wanna know if anyone has a tutorial or any guide step by step to help me with an example. 

[DrAmine]

No there is no tutorial which I can share with you. Just describe what you want to do and we try to provide guidance. Do not expect that we will go through the papers you listed.

[Kobee]

Salute Sir,

Thank you for your reply and I really appreciate that. I am somehow new to this software so forgive me if I ask some basic questions. However, I have managed to do the set up for the problem and I will share with you some screenshot of what I have done so far.

 

Geometry:

[Kobee]

Fluent set up:

the density-based solver and the real gas option was selected. Please advice if this is the best option for this problem.

 

[DrAmine]

The customization manual goes through writing UDF profile. If you have experimental data for the temperature at inlet you can use profile files. Check the user's guide as they need to follow certain forma ( I guess with CSV format it is straightforward). 

 

1/Use pressure based solver. There is no need to use density based solver here. Use the coupled solver

2/Use SST turbulence model. Ensure a relative good resolved boundary layer at walls

3/Are you expecting a supersonic inlet? Pleas check the values for sound speed. Also the intial gauge pressure at inlet is only used whenver it is supersonic at inlet.

4/Probably the time step size is large. You should use rather conservative settings 

5/The temperature at inlet is total temperature and not static temperature: that means if you some overshoots at start of the run it will probably affect the temperature level.

 

[Kobee]

Thank you for your suggestion and I have implemented them accordingly.

I have changed the mesh as below and switched to 2D since the 3D will have many meshes.

[Kobee]

For anyone facing a similar problem like mine, you can define the transient inlet boundary condition by checking out this video

 

 

Thanks

[RK]

Hello, 

What is the Mach number at the inlet?

[Kobee]

From the last trial I did, the velocity contour was reading 2.23x10^3m/s at the inlet. This mean the M#=2.23x10^3/343=6.5.

I don't know if this figure is ridiculous but am open for suggestions sir.

Thanks for the reply.