spanwise averaging in Fluent

hnemati · January 9, 2019, 04:26

Dear all
I have a 3D simulation of a burner in fluent where I want to average the results in spanwise direction. I know I have to define multiple surfaces perpendicular to that direction and just sum them up. However, I don't know how to sum these surfaces up to have the averaged surface. Can anybody help?
With kind regards

LuckyTran · January 9, 2019, 17:28

Okay so you created a bunch of surfaces? You can do surface integrals on each of these and get an average on each? Where are you stuck? I can't understand where you are stuck. What do you mean by sum up the surfaces? Why would you want to do that? That's not a spanwise average.

hnemati · January 10, 2019, 03:15

Quote:

Originally Posted by LuckyTran

Okay so you created a bunch of surfaces? You can do surface integrals on each of these and get an average on each? Where are you stuck? I can't understand where you are stuck. What do you mean by sum up the surfaces? Why would you want to do that? That's not a spanwise average.

What I mean is the ensemble averaging. Which means average in time and periodic (homogeneous) directions. Assume you have a 3D simulation of developing pipe flow; lets say DNS simulation. How do you get the average results? Bravo, you average over time and circumferential direction. Is that right? I can do that if I have my own code but Fluent is different. I hope it is clear now for you.

January 9, 2019, 04:26	spanwise averaging in Fluent	#1
hnemati Member SAM Join Date: Apr 2012 Posts: 74 Rep Power: 14	Dear all I have a 3D simulation of a burner in fluent where I want to average the results in spanwise direction. I know I have to define multiple surfaces perpendicular to that direction and just sum them up. However, I don't know how to sum these surfaces up to have the averaged surface. Can anybody help? With kind regards

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January 9, 2019, 17:28		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,675 Rep Power: 66	Okay so you created a bunch of surfaces? You can do surface integrals on each of these and get an average on each? Where are you stuck? I can't understand where you are stuck. What do you mean by sum up the surfaces? Why would you want to do that? That's not a spanwise average.