Eulerian air-water

- January 28, 2022 at 8:13 am
  
  prebenjs
  Subscriber
  
  I'm looking to simulate a multiphase system of air-water where I want to extract the pressure for each of the phases. I've read that eulerian might be correct here for separating pressure however both phases should be continuous but eulerian requires a droplet diameter for the secondary phase. Do anyone know which model to use ?
- January 28, 2022 at 11:13 am
  
  Nikhil Narale
  Ansys Employee
  
  Hello,
  
  I would highly recommend you to go through the detailed comparison between different multiphase models in Fluent and make an informed decision.
  Here is the link, 14.2.2. Model Comparisons (ansys.com).
  
  Please be informed that the eulerian multiphase model is based on the assumption that all the phases share same pressure field. The same pressure field helps to couple momentum equation of different phases. For more details, refer 14.5.4. Conservation Equations (ansys.com).
  
  Nikhil
- January 28, 2022 at 12:41 pm
  
  prebenjs
  Subscriber
  
  I've seen the detailed comparison and the use would be to either use a VOF (homogenous) or Eulerian multifluid-VOF (inhomogeneous). The drawback of the VOF is that I can't extract the pressure from the different phases in post-processing as is possible in the eulerian multifluid-VOF, due to solving n momentum equations compared to VOF which only solves one. However, when enabling multifluid-VOF the second phase automatically gets a diameter (particle diameter), which should not be there since I want two continuous phases. Regarding the phases sharing pressure field, does this mean that there isn't possible to find the difference in pressure between the phases ?

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