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More services...How to export mesh with material properties to MATLAB?
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2 Replies
Last post: January 12, 2012 7:16am UTC
January 12, 2012 5:58am UTC
How to export mesh with material properties to MATLAB?
Hello all, I am trying to export my mesh to MATLAB.
With "mphmeshstats" or "mphxmeshinfo", I can only get the vertex of each node in the mesh, and the nodes in each element. But I can't relate the material properties to each element in the mesh.
Does anybody know how to relate material properties to each element in the mesh?
Thanks a lot!
Best,
Kan
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January 12, 2012 6:55am UTC in response to Zach
Re: How to export mesh with material properties to MATLAB?
Hi
I suppose that is because in COMSOL the mesh as the physics are related to the geometry Entities, , but in-between the mesh and the physics you still have the shape functions, so you do not have the direct link physics <-> mesh
Probably you need to do some mapping, coming from "classical FEM" it took me some time to understand, and accept, this difference, it's a cleaner math <-> physics separation than the old way, but when you want to exchange data with other programmes it makes life tougher. Since then I have given up trying to work with classical way
--
Good luck
Ivar
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January 12, 2012 7:16am UTC in response to Ivar Kjelberg
Re: How to export mesh with material properties to MATLAB?
Thank you Ivar!
What do you mean by "in-between the mesh and the physics you still have the shape functions"? I don't get it. I need to know the material related to each element. I don't understand why you involved shape function. The material property (e.g. thermal conductivity) relates to the assembly process, specifically speaking, element-level local stiffness matrix. You time the thermal conductivity with the derivatives of shape function and do the integral. Right?
After digging the COMSOL Java API, I found that I can use
[stats,data]=mphmeshstats(model, 'mesh1');
entity=data.elementity{2}; % elementity{2} is triangular element
Then "entity" contains the "Domain" each element belongs to.
Then I can relate material properties to each domain by using information from
model.material.selection.dom
Problem solved anyway, maybe in a stupid way.
Thanks again.
Best,
Kan
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