Volume average in a sub-element

Good day fellow COMSOLers,
I have run a 3D liquid flow simulation and calculated the velocity distribution of a fluid in a domain. I would like to calculate the average velocity of the fluid in certain sub-elements and compare them. Currently, I can't select the desired sub-elements, and I would like to ask how I can do that.
When I create a "volume average" tab under results> derived values, I can only select the entire domain in the selection mode. I have tried creating geometry objects (blocks) where I would like the averaging to take place, however, they don't appear in the domain selection (whether they are defined as solid or surface).

Thank you in advance for your help!
Amin

0 Replies Last Post 2017年6月14日 GMT-0400下午8:18
COMSOL Moderator

Hello Amin Nouri

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