
From:  julien pommier 
Subject:  Re: [Getfemusers] Test and Trial space on different meshes 
Date:  Tue, 06 Jun 2006 11:56:38 +0200 
Useragent:  Thunderbird 1.5.0.2 (X11/20060516) 
Hello Klaus,
The asm_mass_matrix function will not allow you to use directly two mesh_fem with different meshes, you have to go through an "interpolated_fem". What you are looking for is explained in the chapter "Interpolation of a finite element method on nonmatching meshes":is it possible to assemble a mass matrix where Trial and Test Functions are defined on different meshes? For instance the Test Function is defined on a fine, the Trial Function on a coarse mesh \Omega_H, which may be a subset of the fine one \Omega_h. Integration is performed over the fine mesh: \int_{\Omega_h} \partial\phi \partial\psi* where \partial\psi* is the restriction of \psi defined on \Omega_H to \Omega_h. I know that with asm_mass_matrix it is possible to define two different functions mf_u1 and mf_u2 to integrate, but what if they are defined on different meshes?
http://wwwgmm.insatoulouse.fr/getfem/getfemuser/getfemuser_15.html  Julien
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