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[Getfem-users] Prescribed Displacement in one direction only (free slip)

From: Antoine Mazuyer
Subject: [Getfem-users] Prescribed Displacement in one direction only (free slip)
Date: Sun, 2 Jul 2017 13:30:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.6.0

Dear all,

I work with 3D linear elastic problems and I have to prescribed displacements on some boundaries (Dirichlet Conditions)

I use this sample code:

                std::vector< bgeot::scalar_type > F( mf_rhs.nb_dof() * 3 );
                getfem::interpolation_function( mf_rhs, F,
                    my_class_function, attribute_id );
                getfem::add_Dirichlet_condition_with_multipliers( model, mim, "u",
                    mf_u, attribute_id, "Dirichlet" );

to add a Dirichlect condition to my region "attribute_id"
The problem is that my_class_function has an operator() that returns a bgeot::base_vector with three coordinates, containing the three prescribed displacements. With this kind of code, I have to prescribed the displacement in the 3 directions

How can I just precribed the displacement in only one direction, and let the others free ?

Thank you in advance for your advices !

Antoine Mazuyer | PhD. Candidate | ASGA
Team: RING | GeoModeles | UMR7359 GeoRessources
Address: F221 | ENSG | Campus Brabois | 2, rue du Doyen Marcel Roubault
TSA70605 | 54518 Vandoeuvre-les-Nancy Cedex | France
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