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Re: [Getfem-users] Dirichlet condition on curved boundary

From: Yves Renard
Subject: Re: [Getfem-users] Dirichlet condition on curved boundary
Date: Thu, 6 Oct 2011 14:05:25 +0200
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Dear Roman,

Yes, for the moment, you can only use the generalized Dirichlet condition and 
precompute the unit normal field or use the 
asm_normal_component_dirichlet_constraints and use some explicit matrix bricks 
to add manually the constraint to your problem.

I will check if it is easy to build the brick corresponding to a Dirichlet 
condition on the normal component for the new brick system. 


On jeudi 22 septembre 2011, Roman Putanowicz wrote:
> Dear All,
> So far I have had no problems with straight boundaries and Dirichlet
> conditions. However now I have a curved boundary and I would like
> to prescribe displacement  in the direction normal to the boundary.
> In the old brick system there is a calass:
>   getfem::mdbrick_normal_component_Dirichlet
> which seems to be designed exactly for the above task.
> I do not see however a similar class in the new brick system.
> There is a function add_generalized_Dirichlet_condition to set
> a condition of a form H*u=r but using it for my task would
> require to precompute the matrix field of boundary normals.
> There is a function
> asm_normal_component_dirichlet_constraints
> but using it gets me out of the getfem::model framework -- I mean
> I cannot use bricks and have to deal explicitly with he tangent matrix,
> rhs vector and solving the system of equation.
> Is the above picture correct or am I missing something?
> What would be the best approach in such situation ?
> Regards,
> Roman


  Yves Renard (address@hidden)       tel : (33)
  Pole de Mathematiques, INSA-Lyon             fax : (33)
  20, rue Albert Einstein
  69621 Villeurbanne Cedex, FRANCE


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