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From: | Konstantinos Poulios |
Subject: | Re: [Getfem-users] gmres did not converge! |
Date: | Thu, 2 May 2019 15:03:36 +0200 |
Hi, Andriy and Yves and Konstantinos,
I loaded two meshes, totally about 350000 elements.
I only added elasticity bricks:
getfem::add_isotropic_linearized_elasticity_brick(model, mim_1, "u_1", "lambda_1", "mu_1");
getfem::add_isotropic_linearized_elasticity_brick(model, mim_2, "u_2", "lambda_2", "mu_2");
and four pointwise_constraints (two more each mesh):
getfem::add_pointwise_constraints_with_multipliers(model,"u_1","point_1_1","point_1_1_unitx", "point_1_1_valuex");
getfem::add_pointwise_constraints_with_multipliers(model,"u_1","point_1_1","point_1_1_unity", "point_1_1_valuey");
getfem::add_pointwise_constraints_with_multipliers(model,"u_1","point_1_2","point_1_2_unitx", "point_1_2_valuex");
getfem::add_pointwise_constraints_with_multipliers(model,"u_1","point_1_2","point_1_2_unity", "point_1_2_valuey");
getfem::add_pointwise_constraints_with_multipliers(model,"u_2","point_2_1","point_2_1_unitx", "point_2_1_valuex");
getfem::add_pointwise_constraints_with_multipliers(model,"u_2","point_2_1","point_2_1_unity", "point_2_1_valuey");
getfem::add_pointwise_constraints_with_multipliers(model,"u_2","point_2_2","point_2_2_unitx", "point_2_2_valuex");
getfem::add_pointwise_constraints_with_multipliers(model,"u_2","point_2_2","point_2_2_unity", "point_2_2_valuey");
The values for the pointwise_constraints are simply the same as -1. This means the two meshes should just be translated parallelly by -1 in both x and y direction.
My solver is
gmm::iteration iter(1E-9, 1, 100);
getfem::standard_solve(model, iter);
But I get warning of not convergence:
iter 0 residual 1
iter 500 residual 6.17288e-05
Level 2 Warning in getfem/getfem_model_solvers.h, line 127: gmres did not converge!
I am quite sure that my mesh looks good and have no strange shape elements. When I use small simply meshes, the code runs ok.
Could you please advise to me how to improve?
Regards
Zhenghuai Guo
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