[Getdp] Info test-nl.pro

[Christophe Geuzaine]

elettro-g- at tiscali.it wrote:
> Hi,
> I am an italian Phd student and i want use GetDP for investigate the 
> induction motors. I find very interesting the simple you develop 
> about 
> the steel non linearity. Looking the code, i have some difficulty  to 
> understan the formulation involved.
> In particular i do'nt understand the "Magsta_a_nl"...i comprise good 
> the a formulation in the linear case, but in the non linear case i 
> don't understand, in particular, the following espression:
> 
>       Galerkin { JacNL[ - dbdh[ {d phi} ] * Dof{d phi} , {d phi} ] ; 
>                  In Steel ; Jacobian MyJac ; Integration MyInt ; }
> 
>       Galerkin { [ b[ - {d phi} ] , {d phi} ]  ; 
>                 In Steel ; Jacobian MyJac ; Integration MyInt ; }
> 
> What's the meanig of JacNL? What it's role?

It represents the Jacobian used in the Newton-Raphson iterations.



> Why, in the non linar case, is necessary to add the secon expression?
> Mybe I don't Know the right formulation..
> 
> Thenks a lot for your time and your work!!
> I hope you can help me!
> Best
> Ing.  Luigi Alberti
> 
> 
> 
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> 		
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-- 
Christophe Geuzaine
Assistant Professor, Case Western Reserve University, Mathematics
http://www.case.edu/artsci/math/geuzaine