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Average study of RANS results

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Old   April 26, 2019, 06:23
Default Average study of RANS results
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Hi expert,
I recorded .data and .cas files of a turbulent flow with a RANS model and transient every 10-time steps. Now, I want to do an average study of these files, for example, 10 files per post-processing.
is it possible?
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Old   April 26, 2019, 09:48
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Yes and no.

Yes: you should have activated the data sampling for time statistics option before you did the simulation.

No: you can't do it after the fact. You need to re-run it. Or you write your own code that does the averaging.
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Old   April 26, 2019, 10:07
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Dear LuckyTran,
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Yes: you should have activated the data sampling for time statistics option before you did the simulation.
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For this answer how can I do these steps using FLUENT?

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Old   April 26, 2019, 10:31
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In the GUI, in the same place where you can find the calculate button.


There is a checkbox.


Google is your friend.
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Old   April 26, 2019, 10:57
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Dear LuckyTran,
Thank you very much for your quick response, which allowed me to start my studies. If possible, I need more details. I have :
My time interval [0, 0.3] and I want to save the values ​​every 10 steps with:
time step size = 5e-5
Number f time step = 6000
What good values ​​can I have in:
sampling Interval?
Sampling option?
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Old   April 26, 2019, 11:10
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sampling interval 10 means it adds the values to the average every 10 time-steps


sampling options are options. If you want to use them, you can use them. If not, don't.


Read the guide!
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Old   April 26, 2019, 12:23
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Dear LuckyTran,

I followed your advice, but after which iterations the code that diverges. Do you have help to dislodge the situation?
-----------------------------------------------------------------------------------------
Divergence detected in AMG solver: x-momentum
Divergence detected in AMG solver: y-momentum
Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: k
Divergence detected in AMG solver: omega
Divergence detected in AMG solver: x-momentum
Divergence detected in AMG solver: y-momentum
Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: k
Divergence detected in AMG solver: omega
Divergence detected in AMG solver: x-momentum
Divergence detected in AMG solver: y-momentum
Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: k
Divergence detected in AMG solver: omega
reversed flow in 49 faces on pressure-outlet 7.

Divergence detected in AMG solver: x-momentum
Divergence detected in AMG solver: y-momentum
Divergence detected in AMG solver: pressure correction
Divergence detected in AMG solver: k
Divergence detected in AMG solver: omega
Error at host: floating point exception

Error at Node 0: floating point exception

Error at Node 1: floating point exception

Error at Node 2: floating point exception

Error at Node 3: floating point exception

Error: floating point exception
Error Object: #f
-----------------------------------------------------------------------------------------
Quote:
PHP Code:
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Last edited by serrar; April 26, 2019 at 15:10.
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