Re: [Getfem-users] Question about the function 'add_normal_Dirichlet_condition_with_penalization'

[Dominique Fratantonio]

Hi Kostas,

I'm sorry. You are perfectly right. I meant getfem-4.3.

Best regards

Dominique

2015-02-23 9:56 GMT+01:00 Konstantinos Poulios <address@hidden>:

Hi, I am wondering where is the link for 4.3.2 (or even 4.3.1) here:

http://download.gna.org/getfem/stable/

I can only see the tarball for 4.3.

Am I missing something?

Best regards

Kostas

On Sun, Feb 22, 2015 at 5:54 PM, Dominique Fratantonio <address@hidden> wrote:

Hi,

I'm using getfem-4.3.2 and I am having some problem with the function 'add_normal_Dirichlet_condition_with_penalization'.

Here an extract of how I am implementing it:

//--------------------------------------------------------------------------------------------------------------------------------------------------//

   // Main unknown of the problem:

   model.add_fem_variable("u", mf_u);

   // Viscous term

   // Linearized elasticity brick:

   model.add_initialized_fixed_size_data("lambda", plain_vector(1, 0.0)); // Second viscosity coefficient

   model.add_initialized_fixed_size_data("nu", plain_vector(1, 1/(pd.Re)));

   getfem::add_isotropic_linearized_elasticity_brick(model, mim, "u", "lambda", "nu");

   // Incompressible constraint

   // p used as Lagrange multiplier, but it doesn't need to be

   // add_multiplier as for the Dirichlet boundary conditions

   // Linearized incompressibility condition brick:

   model.add_fem_variable("p", mf_p);

   getfem::add_linear_incompressibility(model, mim, "u", "p");

   // Dirichlet condition on inflow:

   std::vector<scalar_type> F(mf_u.nb_dof());

   gmm::clear(F);

   getfem::interpolation_function(mf_u, F, u_exact);

   model.add_initialized_fem_data("InflowData", mf_u, F);

   if (PENALIZATION_INFLOW && act_DNS) {

       // With penalization

       scalar_type dirichlet_coefficient_inflow = 1e8;

       getfem::add_Dirichlet_condition_with_penalization(model,mim,"u",dirichlet_coefficient_inflow,INFLOW_BOUNDARY_NUM,"InflowData");

   } else {

       // With multipliers

       model.add_multiplier("Inflow", mf_mult_inflow, "u", mim,  INFLOW_BOUNDARY_NUM);

       getfem::add_Dirichlet_condition_with_multipliers(model, mim, "u","Inflow",INFLOW_BOUNDARY_NUM,"InflowData");

   }

   // Dirichlet condition on cylinder:

   bgeot::base_vector no_penetration(1); no_penetration[0]=0;

   model.add_initialized_fixed_size_data("CylinderData",no_penetration);

   if (PENALIZATION_CYL && act_DNS) {

       // With penalization

       scalar_type dirichlet_coefficient_cyl = 1e8;

       getfem::add_normal_Dirichlet_condition_with_penalization(model,mim,"u",dirichlet_coefficient_cyl,CYLINDER_BOUNDARY_NUM,"CylinderData");

   } else {

       // With multipliers

       model.add_multiplier("Cylinder", mf_mult_cyl, "u", mim, CYLINDER_BOUNDARY_NUM);

       getfem::add_normal_Dirichlet_condition_with_multipliers(model,mim,"u","Cylinder",CYLINDER_BOUNDARY_NUM,"CylinderData");

   }

   // Build matrices

   model.assembly(getfem::model::BUILD_ALL);

//------------------------------------------------------------------------------------------------------------------------------------------------------//

In the above extract of the code, everything works fine except when I try to use 'add_normal_Dirichlet_condition_with_penalization'.

The similar function 'add_Dirichlet_condition_with_penalization' works fine as well.

Altought I succeed in compiling the code, when 'add_normal_Dirichlet_condition_with_penalization' runs, I obtain the following error:

//------------------------------------------------------------------------------------------------------------------------------------------------------//

Trace 2 in getfem_models.cc, line 5667: Stiffness matrix assembly for isotropic linearized elasticity

Trace 2 in getfem_models.cc, line 5931: Stokes term assembly

Trace 2 in getfem_models.cc, line 3157: Mass term assembly for Dirichlet condition

Trace 2 in getfem_models.cc, line 3201: Source term assembly for Dirichlet condition

Trace 2 in getfem_models.cc, line 3157: Mass term assembly for Dirichlet condition

============================================

|      An error has been detected !!!      |

============================================

Error in getfem_assembling_tensors.cc, line 488 : 

Non matrix field

//------------------------------------------------------------------------------------------------------------------------------------------------------//

I really do not understand how to fix this problem and what it means.

Thank you in advance.

Cheers.

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