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February 1, 2021 at 2:21 pm
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February 1, 2021 at 2:48 pm
Rob
Forum ModeratorDo you have a gas phase present too? Mesh (and cell) quality and time step are more likely to be causing the problems. n -
February 1, 2021 at 3:00 pm
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February 1, 2021 at 3:53 pm
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February 1, 2021 at 4:02 pm
Draxler
SubscriberDid you change the Residual values to a smaller number than the default? nMost youtube videos change them to 10-6 and I was doing that as well. For very simple geometries, this works, but for complex ones, I was also having a problem with converging. I changed them back to 10-3 and the solution did converge. nSmaller residuals lead to more accurate results as far as I know. But in my comparison of the 2, there was very little difference.nn -
February 1, 2021 at 4:11 pm
Rob
Forum ModeratorGiven the SIMPLEC has only done 140 iterations you may want to try running it on. Also note, the PBCS solver uses a courant number or time factor so may converge better if you've not adjusted any of the under relaxation defaults. n -
February 1, 2021 at 4:25 pm
Moussa
SubscriberThank younThe energy residual is falling under e-11, for the sufficient convergence of the iterative solutions, they use e-10 for the energy equation and e-0u00035 for the other conservation equations.nThe results at the initial state (t = 0) are obtained from the steady-state calculation at ptank = 1atm ( temperature contours posted earlier), there is a big difference between the two algorithms.nResiduals using SIMPLEC algorithm in steady-state simulation.nn
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February 1, 2021 at 4:28 pm
Rob
Forum ModeratorWhich isn't converged. Try dropping the momentum under relaxation factor. What density model are you using?n -
February 1, 2021 at 4:52 pm
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February 2, 2021 at 3:15 pm
Moussa
SubscriberAny advice? Thank you in advance.n -
February 2, 2021 at 4:01 pm
Rob
Forum ModeratorI'd be more worried about the continuity equation in the first case. Given PBCS uses a time factor I suspect that's why the convergence is better. Converge the first case properly and then compare the results. n
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