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[ff3d-users] Projection of results between meshes


From: address@hidden
Subject: [ff3d-users] Projection of results between meshes
Date: Mon, 28 May 2007 09:10:52 +0200


Hi Stéphane,
 
 
Is it possible to use two overlapping meshes and to project information from one mesh to the other one ? Since this question is unclear, here is an example:
1) Suppose I have two meshes:
- a first one covering a certain volume,
- a second identical to the first but with an extension so that it covers a bigger volume. In the common region, element, nodes positions and numbering are identical.
 
2) I would like to solve a physical problem on the first mesh and  use the results as data for the second physical problem (solved on the second mesh). I think it would involve somesthing like this :
 
mesh M1 = read(gmsh,"small mesh.msh");
mesh M2 = read(gmsh,"large mesh.msh");
 
// Initial values
femfunction t1(M1)=0;
femfunction t2(M2)=0;
 
//..  solve a first problem on M1 to get t1
//then
 
t2=t1;  //Projection of t1 on t2 on the common part
 
//.. solve a second problem using t2 as property
 
One of the problem, I think is to define the value on the non-common region (a constant value would be OK).
Is it possible with ff3d?
 
Thanks,
 
Dominique.


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