PISO or Coupled (VOF)

- November 30, 2020 at 10:18 am
  
  Nguyen Van Toan
  Subscriber
  
  Hi everyone,
  When we simulate multiphase flow using VOF model, what the Pressure-Velocity Coupling Method is appropriate? PISO or Coupled? Which is faster? And for FSI simulation, is there only Coupled available?
  Thank you so much!
- November 30, 2020 at 10:34 am
  
  DrAmine
  Ansys Employee
  
  A general recommendation in Fluent Multiphase whenever time step size is small PISO will perform better from computational time perspective. Though, I saw a lot of cases running much more efficient using Coupled method . So at the end you need to select the method which works better for you.

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