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September 16, 2013, 09:35 
swak4Foam  Possible to sum across different patches?

#1 
Senior Member
Anne Gerdes
Join Date: Aug 2010
Location: Hamburg
Posts: 161
Rep Power: 7 
Dear Foamers,
I hope this question doesn't already exist in the forum. I would like to calculate an average value which should be evaluated over different patches. Is it possible to do this with swak4foam? Furthermore I would like to compute the difference on each patch to this (global) average value. So far I am able to evaluate the expressions seperately, i.e. I am computing the average value on patch1, compute the difference of my variable (temperature) to this value on patch 1, and I am doing the same for the other patches. It would be great if I could compute an expression like this HTML Code:
gAv= \sum_{Outlet j} \sum{i \in Outlet_j} T_i A_i /A(Outlet j) HTML Code:
\sum_{i \in Outlet j} (T_i A_i  gAv) Thank you very much in advance for an answer or sharing your experiences. Kind Regards Anne 

September 16, 2013, 15:41 

#2  
Assistant Moderator
Bernhard Gschaider
Join Date: Mar 2009
Posts: 3,920
Rep Power: 41 
Quote:
Code:
variables ( "sumHere{here}=sum(T*area());" "sumThere{there}=sum(T*area());" "areaHere{here}=sum(area());" "areaThere{there}=sum(area());" "totalAverage=(sumHere+sumThere)/(areaHere+areaThere);" );
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September 17, 2013, 03:27 

#3 
Senior Member
Anne Gerdes
Join Date: Aug 2010
Location: Hamburg
Posts: 161
Rep Power: 7 
Dear Bernhard,
thank you very much for the fast reply! I will try to make this evaluation run with your instructions as soon as possible. Best Regards Anne 

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