splitting surface to individually calculate mass flow through each

Diger · May 8, 2018, 17:29

See Splitting a Circle into 2 regions

In CFD Post there (apparently) is an option to split a surface and calculate the e.g. mass-flow through each segment.

Is that also already possible within the post-processing of fluent?

LuckyTran · May 8, 2018, 17:49

Doing this in Fluent is a lot cumbersome and you have limited utilities. If you are only doing this for postprocessing, CFDpost is the better choice.

In Fluent.
Go to adapt=> mark/adapt cells => regions and Mark all the cells using a cylinder that contains the boundary you want to separate. This will create a register.

Then you can separate=>faces and use the register you just created.

Note that this actually separates your boundary mesh into two regions. Depending on how much info you are tying to get out of this procedure, this could be overkill.

It might be better to split it in the design modeler. The issue is you don't get a perfect circle, but a collection of cells with jagged edges. This makes any values you postprocess fuzzy. Realizing only at the end that you've forgotten that you one day need to get actual results out does not give positive vibes. But going back to design modeler means starting over from the way beginning.

May 8, 2018, 17:29	splitting surface to individually calculate mass flow through each	#1
Diger Senior Member Join Date: Nov 2015 Posts: 135 Rep Power: 10	See Splitting a Circle into 2 regions In CFD Post there (apparently) is an option to split a surface and calculate the e.g. mass-flow through each segment. Is that also already possible within the post-processing of fluent?

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May 8, 2018, 17:49		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,673 Rep Power: 65	Doing this in Fluent is a lot cumbersome and you have limited utilities. If you are only doing this for postprocessing, CFDpost is the better choice. In Fluent. Go to adapt=> mark/adapt cells => regions and Mark all the cells using a cylinder that contains the boundary you want to separate. This will create a register. Then you can separate=>faces and use the register you just created. Note that this actually separates your boundary mesh into two regions. Depending on how much info you are tying to get out of this procedure, this could be overkill. It might be better to split it in the design modeler. The issue is you don't get a perfect circle, but a collection of cells with jagged edges. This makes any values you postprocess fuzzy. Realizing only at the end that you've forgotten that you one day need to get actual results out does not give positive vibes. But going back to design modeler means starting over from the way beginning.