Check Statistically Stationery state in OF/ParaFoam

chandra shekhar pant · September 11, 2019, 03:45

Hello Foamers,

I am running the unsteady RANS over the aerofoil, to average and understand the results I first need to know when are the statistics stationery (statistically stationery state). Is there any way to check the statistically stationery state during/after the simulations ?

Hope I am making my question clear. Thanks for any help in this regard!

pconen · September 11, 2019, 04:54

Hey,

I don't know if I understand you right and if my statement is correct. But I would say that you can check the residuals whether a state of equilibrium has been reached or not. You can also choose a monitor point. This should not fluctuate over time.
I hope I could help you.

chandra shekhar pant · September 11, 2019, 05:10

Thanks Philipp Cone for the insight. I am guessing will it be correct to look the parameters/variables (u, p etc.) at a point and check if are they changing w.r.t. time? Your inputs are really helpful. Thanks again!

pconen · September 11, 2019, 07:53

Quote:

Originally Posted by chandra shekhar pant

I am guessing will it be correct to look the parameters/variables (u, p etc.) at a point and check if are they changing w.r.t. time?

You are right!

September 11, 2019, 03:45	Check Statistically Stationery state in OF/ParaFoam	#1
chandra shekhar pant Senior Member chandra shekhar pant Join Date: Oct 2010 Posts: 220 Rep Power: 16	Hello Foamers, I am running the unsteady RANS over the aerofoil, to average and understand the results I first need to know when are the statistics stationery (statistically stationery state). Is there any way to check the statistically stationery state during/after the simulations ? Hope I am making my question clear. Thanks for any help in this regard!

September 11, 2019, 04:54		#2
pconen Member Philipp Conen Join Date: Apr 2019 Location: GER, NRW Posts: 35 Blog Entries: 2 Rep Power: 6	Hey, I don't know if I understand you right and if my statement is correct. But I would say that you can check the residuals whether a state of equilibrium has been reached or not. You can also choose a monitor point. This should not fluctuate over time. I hope I could help you. __________________ Greetings Philipp Conen

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September 11, 2019, 05:10		#3
chandra shekhar pant Senior Member chandra shekhar pant Join Date: Oct 2010 Posts: 220 Rep Power: 16	Thanks Philipp Cone for the insight. I am guessing will it be correct to look the parameters/variables (u, p etc.) at a point and check if are they changing w.r.t. time? Your inputs are really helpful. Thanks again!