backpressure issue

matthewsun · June 12, 2010, 01:05

HI,there!
I got a case which is to calculate the back pressure of an exhaust system, and it's perfectly converged ,but i was a little bit confused when it comes to post processing as the followings:
In the surface integrals of the report:
area-weighted average
total pressure Pa
inlet 52716.32
outlet 1773.2864
net 24235.805
problem is the net doesn't equal inlet minus outlet.why?

coglione · June 14, 2010, 05:01

Because "net" means the area-weighted average of both faces and not its difference.

cheers

June 12, 2010, 01:05	backpressure issue	#1
matthewsun New Member sunqiang Join Date: Nov 2009 Posts: 23 Rep Power: 17	HI,there! I got a case which is to calculate the back pressure of an exhaust system, and it's perfectly converged ,but i was a little bit confused when it comes to post processing as the followings: In the surface integrals of the report: area-weighted average total pressure Pa inlet 52716.32 outlet 1773.2864 net 24235.805 problem is the net doesn't equal inlet minus outlet.why? Last edited by matthewsun; June 12, 2010 at 05:01.

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June 14, 2010, 05:01		#2
coglione Senior Member Max Join Date: Mar 2009 Posts: 133 Rep Power: 17	Because "net" means the area-weighted average of both faces and not its difference. cheers