ANSYS SOLUTION ERROR

- April 27, 2022 at 7:07 am
  
  chehade
  Subscriber
  
  When simulating the 6DOF rotation of a turbine i get 2 errors: one stating there is reverse flow at the pressure outlet and the other which is weird stating: unable to write motion history file.
  i was told the 1st is not a problem for my simulation but the 2nd i do not understand. Are they related?
- April 27, 2022 at 7:57 am
  
  chehade
  Subscriber
  
  this shows the residuals
- April 27, 2022 at 10:46 am
  
  Rob
  Forum Moderator
  
  Reverse flow is a warning, not an error and just means you have some flow coming in through the outlet. Assuming the outlet is sufficiently far from the area of interest it's not a problem.
  Why are you using 6DOF for a turbine? Reference frame or sliding mesh should be sufficient.
- April 27, 2022 at 2:40 pm
  
  chehade
  Subscriber
  
  the objective of the project is to let the flow turn the turbine so i need to use 6DOF. So it does not block the solution from converging? Problem is that the simulation takes too long to finish and check for issues so its better to fix them at the start.
- April 27, 2022 at 3:21 pm
  
  chehade
  Subscriber
  
  the box is 16m long and cylinder 6m. The turbine diameter is 120cm.
- April 28, 2022 at 1:46 pm
  
  Rob
  Forum Moderator
  
  No reason to not take the force on the blades and feed that into the moving reference frame speed via either a UDF or expression.
  Reverse flow may not help convergence but shouldn't stop the model converging. However, given the domain size I'm not sure why you're getting it.

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