SuperCritical CO2 with NIST Real Gas Model

- October 15, 2023 at 9:41 pm
  
  Zoelle Wong
  Subscriber
  
  Hi,
  I'm new to ANSYS and I'm trying to use SCO2 as my fluid material. My application is flow through a Converging - Diverging nozzle. My current mesh reached a converged solution when my fluid material was air. I switched to SCO2 as my fluid material, whereby I use the NIST real gas model instead of an ideal gas model. However I get the following error message
  
  I'm fairly certain my boundary conditions (mass flow rate inlet, pressure outlet) and initial conditions are correct but I'm not sure what else could be contributing to my error. Does anybody have experience with this? Thank you so much in advance
- October 16, 2023 at 5:40 am
  
  SRP
  Ansys Employee
  
  Hi,
  I suggest you to check fluent user's guide: 8.16. Real Gas Models (ansys.com)
  Hope this helps you.
  - October 16, 2023 at 1:24 pm
    
    Zoelle Wong
    Subscriber
    
    Yes I already have read the manual and followed through with the TUI commands for activiating the NIST real gas model. I'm fairly certain my intial temperature and boundary condition temperature is correct; I'm not sure if the temperature being "low" is a result of a meshing or numerical stability. Can you put me in touch with someone who has experience on this application? There is literature of ANSYS being used for SCO2, but the posted literature doesn't give a "step by step" guide on the inputs they used for convergene. Thanks again