July 23, 2020 at 11:20 amNicoloSubscriber
I have performed a two phase flow simulation both in transient and steady state.
Once I run it in transient apparently there is no problem and I can see the flow regime is kind of a plug flow with a lot of up and down, but once I try the steady state simulation the residuals don't reduce and it does not look like it is converging (I have attached the picture).
July 24, 2020 at 1:14 pmRobAnsys Employee
Steady state solver will try and find the single solution to the problem, if there are any transient features in the flow it'll struggle to converge, and typically give a residual plot like you see. However, the scale of error may be small enough that you can ignore it.
The transient solver will pick up and include all of the small changes if the time step is correct. These changes may be small enough that you don't really notice them, but the changes may be sufficient that there isn't a steady solution.
Have a look in the tutorials for monitor points: we use those to help understand if a solution is converged.
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