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Sum of variables in different domain definition
Posted Jun 27, 2017, 4:03 a.m. EDT 3 Replies
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Hello everyone,
I would like to sum two variables define in two different domains.
The first domain (1) is included in the second one (2)
When i want to sum variables and plot it, i have only the plot of the intersection between the two domains but i want to have the plot inside the domains two (2) only, the bigger one.
I already tried to define variables of domain 1 equal to zero in domain 2, in order to have variable define in all the domain, but it didn't works.
Do you have any suggestions, advices or solutions ?
Regards
François
I would like to sum two variables define in two different domains.
The first domain (1) is included in the second one (2)
When i want to sum variables and plot it, i have only the plot of the intersection between the two domains but i want to have the plot inside the domains two (2) only, the bigger one.
I already tried to define variables of domain 1 equal to zero in domain 2, in order to have variable define in all the domain, but it didn't works.
Do you have any suggestions, advices or solutions ?
Regards
François
3 Replies Last Post Jun 27, 2017, 8:33 a.m. EDT
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Posted:
7 years ago
Hi
You may sum up two global's (individual averages or integrals over each domains) but this is different than the total integral or average over both Entities (Domain or Boundaries ...)
But as most "variables" in COMSOL are in fact "fields" depending on (x,y,z) (and or time t or frequency f) you cannot "sum" them without having some mapping function to link Entities.
So what do you really want to do ?
and be aware of the implicit sums/integrations/averages of COMSOL
--
Good luck
Ivar
You may sum up two global's (individual averages or integrals over each domains) but this is different than the total integral or average over both Entities (Domain or Boundaries ...)
But as most "variables" in COMSOL are in fact "fields" depending on (x,y,z) (and or time t or frequency f) you cannot "sum" them without having some mapping function to link Entities.
So what do you really want to do ?
and be aware of the implicit sums/integrations/averages of COMSOL
--
Good luck
Ivar
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Posted:
7 years ago
Updated:
7 years ago
Hello Francois,
Have you tried creating a third variable, and define it as var1+var2 in domain1 and var2 in the part of domain2 that is not in domain1?
See the attached file.
Best,
Jeff
Have you tried creating a third variable, and define it as var1+var2 in domain1 and var2 in the part of domain2 that is not in domain1?
See the attached file.
Best,
Jeff
Attachments:
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Posted:
7 years ago
Hello,
I found a solution, the problem was from variable divided by zero and after that the sum was not possible.
So i define a new variable (A) inside my domain 1 , which one depend from variables and i can do calculation (dividing up) inside my own domain 1.
I define A=0 everywhere else in domain 2
When i want to sum the new variable A with variable of domain 2, it works, the sum is effective in the whole domain 2.
thanks for your advice.
I found a solution, the problem was from variable divided by zero and after that the sum was not possible.
So i define a new variable (A) inside my domain 1 , which one depend from variables and i can do calculation (dividing up) inside my own domain 1.
I define A=0 everywhere else in domain 2
When i want to sum the new variable A with variable of domain 2, it works, the sum is effective in the whole domain 2.
thanks for your advice.