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Comparing Cases at Same Time but different timestep

- December 5, 2025 at 4:25 pm
  
  Kelsey O'Donnell
  Subscriber
  
  I am trying to compare cases of two transient simulations with the same mesh and slightly different background conditions. The simulations all ran for 30s but I used slightly different timesteps for a few (to decrease computation time but maintain a courant number under 1) and for a few other I had to restart simulations so the numbers of the timesteps don't necessarily match up. All this being said, I cannot seem to compare the two cases with two different timesteps (which I see others have said causes issues) but I wonder if there is a way to still compare the transient results and not simply the time-averaged ones? Let me know what I should do, thanks!
- December 8, 2025 at 9:30 am
  
  SRP
  Ansys Employee
  
  Hi,
  You can try to do so in CFD post: 13.8. Case Comparison
- December 9, 2025 at 9:02 am
  
  Rob
  Forum Moderator
  
  You may also want to read this https://innovation.ansys.com/main/forum/topics/fluent-how-to-change-starting-flow-time-time-step-ext The warnings in the thread still apply!

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