Boundary Conditions while using Symmetry planes

garychem · March 17, 2011, 20:43

Hi all,
I am using symmetry planes in the geometry. From what I understand, if I'm designing a quarter section of the equipment, the inlet mass flow rates will also be quarter of that of the equipment as a whole. However, will the same condition be applied to the outlet pressure? I am using an outlet pressure of 17 kPa (outlet pressure for the whole equipment), so should I use 1/4th the outlet pressure for the quarter section?
Thanks.

Lance · March 18, 2011, 03:37

Pressure is an intensive property and does not depend on the system size, unlike mass which is a extensive property.

So, no, you should set 17 kPa at your outlet.

http://en.wikipedia.org/wiki/Intensi...ive_properties

garychem · March 18, 2011, 20:22

Thanks a lot for the information.

March 17, 2011, 20:43	Boundary Conditions while using Symmetry planes	#1
garychem New Member Gary Join Date: Feb 2011 Posts: 6 Rep Power: 16	Hi all, I am using symmetry planes in the geometry. From what I understand, if I'm designing a quarter section of the equipment, the inlet mass flow rates will also be quarter of that of the equipment as a whole. However, will the same condition be applied to the outlet pressure? I am using an outlet pressure of 17 kPa (outlet pressure for the whole equipment), so should I use 1/4th the outlet pressure for the quarter section? Thanks.

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March 18, 2011, 03:37		#2
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 23	Pressure is an intensive property and does not depend on the system size, unlike mass which is a extensive property. So, no, you should set 17 kPa at your outlet. http://en.wikipedia.org/wiki/Intensi...ive_properties

March 18, 2011, 20:22		#3
garychem New Member Gary Join Date: Feb 2011 Posts: 6 Rep Power: 16	Thanks a lot for the information.