# Average study of RANS results

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 April 26, 2019, 06:23 Average study of RANS results #1 Member   Join Date: Sep 2018 Posts: 31 Rep Power: 5 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? Best regards,

 April 26, 2019, 09:48 #2 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 4,278 Rep Power: 51 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.

 April 26, 2019, 10:07 #3 Member   Join Date: Sep 2018 Posts: 31 Rep Power: 5 Dear LuckyTran, ----------------------------------------------------------------------------------- Yes: you should have activated the data sampling for time statistics option before you did the simulation. ----------------------------------------------------------------------------------- For this answer how can I do these steps using FLUENT? Best regards,

 April 26, 2019, 10:31 #4 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 4,278 Rep Power: 51 In the GUI, in the same place where you can find the calculate button. There is a checkbox. Google is your friend.

 April 26, 2019, 10:57 #5 Member   Join Date: Sep 2018 Posts: 31 Rep Power: 5 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? Best regards,

 April 26, 2019, 11:10 #6 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 4,278 Rep Power: 51 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!

April 26, 2019, 12:23
#7
Member

Join Date: Sep 2018
Posts: 31
Rep Power: 5
Dear LuckyTran,

I followed your advice, but after which iterations the code that diverges. Do you have help to dislodge the situation?
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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:
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Last edited by serrar; April 26, 2019 at 15:10.

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