Learning Forum

[F123rooq]

Hello,

I am simulating liquid co2 flowing through a pipe into the atmosphere, which is air. Should I use the multiphase (VOF, Mixture, Eulerian), or the species model.

Sorry I am new to ansys, nevermind fluent, so that is why I am a bit confused. If you can help me out with the different models, I would appreciate your help.

 

Thank You

Regards,

[Rob]

If the two fluids contact each other then, yes, use a multiphase model. If the liquid remains inside the pipe you just need to define two fluid materials and carefully assign the materials in the cell zones. 

[F123rooq]

Thank you for help. In regards to the CO2 options available in ansys fluent material database, there are two, one is just CO2 and the other is CO2-, do you know what the different is between the two, because I have read in a lot of posts that the minus one is liquid, but it has a density of 1kg/m^3, which is no where near the 1100kg/m^3 of liquid CO2. Can you clarify please what the difference is, and is it possible to obtain all the information for liquid CO2 online, and I just add it as another material.

And yes the two fluids do come into contact, so I will use the multiphase eularian modal.

 

Kind Regards,

 

[Rob]

No, CO2- will most likely be the radical: it's an intermediate material in some reactions. 

You'll need to define the three materials, one for liquid phase and a mixture for the gas phase. 

[F123rooq]

I have entered the value for the density and the dynamic viscosity into the material section to create a new fluid (liquid co2). Could you please confirm whether this is correct, in terms of adding a new fluid. I am not dealing with temperature or anything else, I am just interested in the fluid flow, in my study, so I haven't added any temperature etc, but I wouldn't know how to either.

Thank you for your help.

 

Kind Regards,

[Amine Ben Hadj Ali]

You can add or overwrite it does not play a role. So I assume all is correct.