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Search: Posts Made By: LuckyTran
Forum: FLUENT January 17, 2019, 09:30
Replies: 14
Views: 530
Posted By LuckyTran
It is an art. You have to learn how to do it for...

It is an art. You have to learn how to do it for each specific problem.


It is like learning how to light a grill or start a real fire. You try many different ways until you figure it out.
Forum: FLUENT January 16, 2019, 08:20
Replies: 14
Views: 530
Posted By LuckyTran
Well first I don't care that the residuals...

Well first I don't care that the residuals fluctuate. What matters is how the solution behaves.

9 times out of 10 it is a mesh quality issue. The other 1 time out of 10, the user has tweaked a...
Forum: FLUENT January 14, 2019, 15:20
Replies: 14
Views: 530
Posted By LuckyTran
That's a sometimes a necessary but not always...

That's a sometimes a necessary but not always sufficient condition. If the outlet temperature is not steady then obviously the solution isn't converged. But even when the outlet temperature is...
Forum: FLUENT January 14, 2019, 11:26
Replies: 14
Views: 530
Posted By LuckyTran
Do you have any warnings like max something...

Do you have any warnings like max something limited or min something limited? Those can slow down a simulation by a lot because they stall the convergence of the calculation at the inner iteration...
Forum: FLUENT January 14, 2019, 10:11
Replies: 14
Views: 530
Posted By LuckyTran
If 8 runs faster than 1 then okay. Are you...

If 8 runs faster than 1 then okay.

Are you complaining your simulation is too fast or too slow? To me, it feels a little slow for 50k cells (by some integer factor like 1/2 or something).
Forum: FLUENT January 14, 2019, 00:41
Replies: 14
Views: 530
Posted By LuckyTran
50k cells might just be too few to receive any...

50k cells might just be too few to receive any benefit of parallelization. Run a quick test with 1 vs 2 vs 4 vs 8 cores. Just do like 10-100 iterations to time it.
Forum: FLUENT January 13, 2019, 23:04
Replies: 14
Views: 530
Posted By LuckyTran
Yes that works for ignition. Calculation...

Yes that works for ignition.

Calculation time seems to be on the right order of magnitude if you have 1 million cells or more. But yes, it sounds about right.
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