Sub timestep courant number in explicit VOF

- August 22, 2023 at 11:33 am
  
  Amit Kunte
  Subscriber
  
  Hi,
  In adaptive timestepping, when the global courant number is reduced from default value of 2 to say, a value below 0.25, how does the sub time step courant number (co) get adjusted internally? Or does it have to be manually set to the desired ratio (default co_global/co_subtimestep =8).
  Eg: If I have reduced global co to 0.01, and not changed the explicit subtime co (default 0.25), then the VOF eqn is being advanced further in time than the other eqns? Is there a way to fix the ratio to a constant value in Fluent?
- August 23, 2023 at 2:17 pm
  
  SRP
  Ansys Employee
  
  Hi,
  I suggest to please check fluent user's guide on adaptive meshing: 35.13. Performing Time-Dependent Calculations (ansys.com). It gives complete explanation on the timestep.
  Hope you will find this useful.
  Thank you.

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