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postprocessing in Matlab, multiple geometries
Posted Jul 8, 2009, 2:48 p.m. EDT 2 Replies
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Hi,
I made MPH file in Comsol GUI with multiple geometries, saved it and now want to use it in Matlab Interface.
So I load the file with flload and then try to select one geometry with
fem=xfem.fem{3};
and use it with
u = postinterp(fem,'u',pos,'solnum','end');
I get error:
"Extended mesh found in the FEM structure. You need to call meshextend first."
Then, I try to put before postinterp:
fem.xmesh=meshextend(fem);
but I get another msg:
fem.elemcpl{1}.g{1} is not a valid geometry number
Anyone can help?
thanks
I made MPH file in Comsol GUI with multiple geometries, saved it and now want to use it in Matlab Interface.
So I load the file with flload and then try to select one geometry with
fem=xfem.fem{3};
and use it with
u = postinterp(fem,'u',pos,'solnum','end');
I get error:
"Extended mesh found in the FEM structure. You need to call meshextend first."
Then, I try to put before postinterp:
fem.xmesh=meshextend(fem);
but I get another msg:
fem.elemcpl{1}.g{1} is not a valid geometry number
Anyone can help?
thanks
2 Replies Last Post Jul 22, 2009, 10:13 a.m. EDT
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Posted:
1 decade ago
Hi,
I usually do the following:
COMSOL:
1) Setup of model in Comsol GUI
2) Solve it with one set of parameters, check the results
3) Reset model
4) Create mesh
5) Save
6) Export as "fem"
MATLAB:
1) Save fem
M-FILE:
1) clear fem
load fem
fem.xmesh=meshextend(fem);
fem.sol=femstatic(fem, ...
'solcomp',{' ............
[if you save your Comsol GUI (incl. solving and postprocessing) as .m-File and open it with Matlab, you see the necessary comands]
Regards
David
www.comsol.de/company/consultants/wenger/
I usually do the following:
COMSOL:
1) Setup of model in Comsol GUI
2) Solve it with one set of parameters, check the results
3) Reset model
4) Create mesh
5) Save
6) Export as "fem"
MATLAB:
1) Save fem
M-FILE:
1) clear fem
load fem
fem.xmesh=meshextend(fem);
fem.sol=femstatic(fem, ...
'solcomp',{' ............
[if you save your Comsol GUI (incl. solving and postprocessing) as .m-File and open it with Matlab, you see the necessary comands]
Regards
David
www.comsol.de/company/consultants/wenger/
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Unfortunately, by saving Comsol GUI as M-file, you don't get how to use 'postinterp' function, because normally GUI uses postplot and similar functions...
But here's what they wrote me from Comsol Support:
You should use xfem as input to postinterp, and use the property
'geomnum' to control on which geometry interpolation should take
place. Thus, something like
u = postinterp(xfem,'u',pos,'solnum','end','geomnum',3);
where number 3 is replaced with the appropriate number in your
specific model.
Sincerely,
Markus Jonsson
Comsol Support
But here's what they wrote me from Comsol Support:
You should use xfem as input to postinterp, and use the property
'geomnum' to control on which geometry interpolation should take
place. Thus, something like
u = postinterp(xfem,'u',pos,'solnum','end','geomnum',3);
where number 3 is replaced with the appropriate number in your
specific model.
Sincerely,
Markus Jonsson
Comsol Support