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Re: Coupling equations

From: Tetsuo Koyama
Subject: Re: Coupling equations
Date: Wed, 11 May 2022 23:23:59 +0900

Dear Bourriche

Thank you for reply.
I also think it works.

Best Tetsuo

2022年5月11日(水) 23:13 Bourriche Lahoussaine <>:
Hy Tetsu
Thank you for your time.
I saw the link and it's far from what i have, my problem is kind of  :
Laplace(A) + B =0
Laplace(B) + A =0
 I suggest :
#Equation 1 :
Add_non_lineair_term( " Weak form of ( Laplace(A)  ) )")
Add_lineair_term( " Weak form of B  )")
#Equation 2 :
Add_non_lineair_term( " Weak form of ( Laplace(B)  ) )")
Add_lineair_term( " Weak form of A  )")

I disscused this with mr. Renard and he is ok with it. What do you think you

Best Lahoussaine


Lahoussaine BOURRICHE
3A, ENSEEIHT , Physique numérique
+33 6 20 76 17 12

De: "Tetsuo Koyama" <>
À: "Lahoussaine Bourriche" <>
Cc: "getfem-users" <>
Envoyé: Mercredi 11 Mai 2022 15:58:06
Objet: Coupling equations

Dear Bourriche Lahoussaine
> When i have two coupling equation, how getfem knows that I m working on the 
> first equation /second equation, in other words 
> How getfem will knowz which term to put in which equation 
> Add_lineair (first equation)
> Add_lineair (second equation)
We have to combine bricks to variables which is define by MeshFem object.
GetFEM builds tangent matrix on each variable.
This tutorial might helps you.
Best Tetsuo


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