How to get partial surface integration ?

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Author Message   Liem Peng Hong (liemph) Member Username: liemph Post Number: 8 Registered: 09-2004 Posted on Sunday, June 25, 2006 - 09:43 pm:    Dea Forum, I'd like to evaluate the leakage at the boundary of a 2D (RZ geometry) diffusion problem. I can get the total leakage by the following command: report (surf_integral(normal(Fluxd), "Outer") / vol_integral(Production, "Reactor")) as "Lkg" However, how can I get the leakage breakdown, i.e. only from the top, bottom and lateral surface ? I tried to divide the "Outer" surface into 3 surfaces (top, bottom and lateral surfaces of the cylinder) but failed. Thanks in advance. Liem.   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 651 Registered: 06-2003 Posted on Tuesday, July 11, 2006 - 12:58 pm:    Overlay named features on the segments of the boundary you want to integrate, and then specify those boundary names in the surf_integral() call.   Liem Peng Hong (liemph) Member Username: liemph Post Number: 9 Registered: 09-2004 Posted on Thursday, July 20, 2006 - 10:20 am:    Dear Robert, Thank you for your reply, however still I can not understand the meaning of overlay. Here is my domain definition (R-Z geometry, right cylinder). BOUNDARIES REGION 1 "Reactor" start "Outer" ( 0., Height/2) Natural (Flux) = -Flux/(0.7104*Lamda_Tr) line to ( Rad, Height/2) Natural (Flux) = -Flux/(0.7104*Lamda_Tr) line to ( Rad, 0.) Natural (Flux) = 0.0 line to ( 0., 0.) Natural (Flux) = 0.0 line to close If I want to evaluate the surf_integral() for just the segment of (0, Height/2) -> (Rad, Height/2), what should I do ? Thanks in advance, Liem   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 661 Registered: 06-2003 Posted on Thursday, July 20, 2006 - 04:07 pm:    Add to BOUNDARIES section: FEATURE START "IntegralPath" (0,Height/2) LINE TO (Rad,Height/2) Add wherever you want to use it: ... surf_integral(<expression>,"IntegralPath")