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Why the convergence of a steady problem also need several time evolution steps |
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June 9, 2020, 04:42 |
Why the convergence of a steady problem also need several time evolution steps
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#1 |
Member
Wenming Yang
Join Date: Jun 2018
Posts: 42
Rep Power: 8 |
Dear Foamers,
I found that if we solve a steady problem such as that using "simpleFoam", whereas the convergence of it also need several time steps. I am not sure if this is a general conclusion. I checked this using the tutorials of "incompressible/simpleFoam/airFoil2D" in OpenFOAM. If this is true, is it mean that we have to use two times when solving a transient problem, one is for the evolution within another time step. I am confused about this. Dose anyone has some ideas? |
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June 15, 2020, 06:03 |
transient and steady-state: 2 & 1 time consideration respectively
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#2 |
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Sourav Mandal
Join Date: Jul 2019
Posts: 55
Rep Power: 7 |
Hi,
You are right, there are 2 different times to be considered in transient problem. Whereas for any steady-state only one. I have never run in the transient simulation, only have worked with steady-state problems so far. As far as I know, this stems from courant number consideration, which is important for transient but need not be considered for steady-state. I can share some links that might be useful: https://en.wikipedia.org/wiki/Couran...Lewy_condition Courant Number PS: I am new to CFD simulation, experienced users don't hesitate to correct me if I am unclear / wrong. |
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June 15, 2020, 20:03 |
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#3 |
Member
Wenming Yang
Join Date: Jun 2018
Posts: 42
Rep Power: 8 |
Dear Sourav,
Thank you for your reply. I am not sure with this. But there is no second time in some transients solver such as pisoFoam in OpenFOAM. |
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steady problems, time evolution, transient problem |
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