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Re: [Getfem-users] How to apply hydraulic pressure on the boundary

From: Yves Renard
Subject: Re: [Getfem-users] How to apply hydraulic pressure on the boundary
Date: Wed, 1 May 2019 14:43:04 +0200 (CEST)

Dear Zhenghuai,

It indicates that an element has a non-invertible transformation (a completely 
flat element).

It should be removed before doing any computation.

Best regards,


----- Original Message -----
From: "Zhenghuai Guo" <address@hidden>
To: "yves renard" <address@hidden>, "andriy andreykiv" <address@hidden>
Cc: "getfem-users" <address@hidden>, "Konstantinos Poulios" <address@hidden>
Sent: Mercredi 1 Mai 2019 11:49:35
Subject: RE: How to apply hydraulic pressure on the boundary

Hi, Andriy and Yves and Konstantinos,

I use gmsh to build a mesh and import in getfem. In the code, I only add the

getfem::add_isotropic_linearized_elasticity_brick(model, mim_1, "u_1", 
"lambda_1", "mu_1");


getfem::add_Dirichlet_condition_with_multipliers(model, mim_1, "u_1", mf_u_1, 
total_outer_bounday_1,"Dirichlet_value" );

When I try to solve the equations, I got


The mesh I loaded has an irregular outer boundary as below. When I change the 
mesh to a simple rectangle outer boundary mesh (also from gsmh), the test 
program runs ok. Can you please advise,  what normally does this error message 
indicates? I suppose something is wrong with the irregular boundary mesh. Thank 
you very much


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