Hello,
I'm running 2 phase flow implicit Eularian-Eularian flow model.
created model.
defined material to each phase.
defined boundary conditions-for inlet, it's mass flow rate with initial gauge pressure defined
defined outlet pressure boundary condition- as outlet pressure values.
Then velocity slip ratio defined based on variable mass flow rate of phase 1 but constant mass flow rate of phase 2.
All above boundary conditions are defined as profile UDFs as function of flow time.
then phase coupled simple solver is used.
rest is just a calculations activities, with surface monitors.
the case successfully setup and started calculations till 300 time steps with 1 second as time step size.
after that UDF, as function of time, provides new values to the solver. and that's where everything goes wrong and suddenly I receive divergence in AMG solver. Which I shouldn't be getting since the case ran successfully for first 300 time steps
so I need help to know what exactly went wrong.
thank you,
regards,
It sounds like something is wrong with the UDF, but it's hard to say without seeing it. Check your flow rates and see if anything looks suspicious. Other than that, I would say reduce your time step. I usually use 1e-7, but I need this kind of resolution.
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