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Why is my simulation not considered converged?

Question asked by Martin Malmqvist on Aug 6, 2020
Latest reply on Aug 6, 2020 by Bill McEachern

I don't understand how convergence criterion works. In the case pictured - the criterion is set manually to 0.5 m/s velocity and 0.5 kg/s mass flow. What are these numbers measured against? I would assume that they are compared to a delta-value taken from an iteration interval of a certain length. Do I need to specify that interval somewhere?

(As you can see in the picture, apparently a variation of 0.2 m/s over a period of 100 iterations wasn't enough to satisfy the criteria of 0.5 m/s.)

 

Edit, just to clarify: I don't believe that it should be considered converged between iterations 400 and 500 - I can see that the values changes after that. I just wonder what it takes. As of right now, the simulation is up to 1.000 iterations, and both criterion has been satisfied, if you look at the interval between 500 and 1.000 iterations.

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