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Forum: CFX Today, 03:55

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By ghorrocks Doesn't this mean that it is looking likely the... Doesn't this mean that it is looking likely the simulation is transient and therefore will never converge steady state? You will find that discussed in the FAQ I posted way back in post #2.

Forum: CFX Yesterday, 22:02

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By w sy Thank you very much. I am using ANSYS CFX... Thank you very much. I am using ANSYS CFX 20.1, 2018 and 2024 versions which I have tried. At present, even if the phase transition is not considered, when the outlet pressure is above the...

Forum: CFX Yesterday, 20:47

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By Opaque What release of the Ansys CFX Solver are you... What release of the Ansys CFX Solver are you using? Are you familiar with all the nuisances of the equation of state within the dome, just below the critical point?

Forum: CFX Yesterday, 20:36

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By w sy reply Thank you very much for your attention and suggestions. About Temperature/pressure range: 10~3.4 MPa 318.98~272.28 K (covering all working conditions) As for boundary conditions: The pressure...

Forum: CFX Yesterday, 15:29

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By Opaque Thank you for noticing this. I assumed P_t at the... Thank you for noticing this. I assumed P_t at the inlet. Static Pressure inlet -> Static Pressure outlet setup is doomed to fail. It is an ill-conditioned setup.

Forum: CFX Yesterday, 14:36

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By evcelica What Temperature range is this simulation? The... What Temperature range is this simulation? The previous suggestions are great, I'd follow those first. Why Pressure IN and Pressure OUT conditions? Why not Mass Flow Inlet and Pressure Outlet,...

Forum: CFX Yesterday, 11:08

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By w sy reply Thank you very much. Next I will take your advice and try it. For example, phase transition will occur only when the outlet pressure is lower than 7MPa, while no phase transition will occur when...

Forum: CFX Yesterday, 10:54

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By Opaque It is not trivial to isolate the root of the... It is not trivial to isolate the root of the instability for complex models. Like in any area, it is best to learn the basics and increment complexity. Attempt to run the same model using ideal...

Forum: CFX Yesterday, 10:36

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By w sy reply First of all, thank you very much for your attention and suggestions. Your way of dealing with the problem is very good. I haven't done a simulation of the ideal gas yet. My model is derived from...

Forum: CFX Yesterday, 10:22

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By w sy reply First of all, thank you very much for your attention and suggestions. I will seriously consider your suggestions, which will be very helpful for me to solve the problem. My model comes from other...

Forum: CFX Yesterday, 10:00

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By Opaque I assume you have already simulated the ideal gas... I assume you have already simulated the ideal gas case, regardless if the phase change or trans-critical properties are not exact. How did that case converge? What adjustments out of the ordinary...

Forum: CFX Yesterday, 05:59

Replies: 12 CFX simulation of trans-critical CO2 does not converge Views: 86 Posted By ghorrocks This is a very complex model and there are many,... This is a very complex model and there are many, many things which could be causing your issues. You have not given enough detail for me to make specific suggestions, but definitely have a read of...

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