one fin instead of an array of fins

s.amirzadeh · September 11, 2016, 13:35

hi,
im trying to simulate a row of tubes,
i want to use one fin instead of all of them,by simulating one fin and defining aximmetric boundary for right and left,
but i don't know how to do this, i searched a lot but it didn't help, anyone can help me?
here is a top view schematic:

ghorrocks · September 11, 2016, 19:01

You should define translational periodic boundaries on the left and right faces, and impose a flow rate or pressure drop across them to drive the flow.

s.amirzadeh · September 11, 2016, 23:31

thank you, flow in this case is from up to down, not left to right, how do i find flow rate or pressure drop for those?
i taught we define a bc that counts the effect of adjacent fins and we don't need to define any parameter.

ghorrocks · September 12, 2016, 01:34

The usual approach is to use periodic boundary pairs. They are the same as I mentioned in my previous post, except you don't impose a pressure difference or flow rate across it.

You can use symmetry boundaries, but only if the flow is truly symmetric.

s.amirzadeh · September 12, 2016, 04:57

thanks, it's very useful.

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September 11, 2016, 19:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,705 Rep Power: 143	You should define translational periodic boundaries on the left and right faces, and impose a flow rate or pressure drop across them to drive the flow.

September 11, 2016, 23:31		#3
s.amirzadeh New Member Join Date: Oct 2014 Posts: 23 Rep Power: 11	thank you, flow in this case is from up to down, not left to right, how do i find flow rate or pressure drop for those? i taught we define a bc that counts the effect of adjacent fins and we don't need to define any parameter.

September 12, 2016, 01:34		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,705 Rep Power: 143	The usual approach is to use periodic boundary pairs. They are the same as I mentioned in my previous post, except you don't impose a pressure difference or flow rate across it. You can use symmetry boundaries, but only if the flow is truly symmetric.

September 12, 2016, 04:57		#5
s.amirzadeh New Member Join Date: Oct 2014 Posts: 23 Rep Power: 11	thanks, it's very useful.