Comsol question

rocket · July 30, 2009, 07:37

Hi,

I used Comsol to solve a PDE problem. I know that the solution is stored in the object fem.sol.u and the unstructured mesh points are stored in fem.mesh.p. If we assume fem.sol.u is a matrix of M*N (M is the number of spatial mesh points, and N is that for the time steps), then the fem.mesh.p should also have the dimension of M. Unfortunately, the mapping between index of p and u is not specified. Could anyone tell me how to do? Thanks.

Windson

Vasilis · July 30, 2009, 11:19

You may never find how to do the mapping. One possible solution to your problem is to check if Comsol can export the solution in a different format, i.e., CGNS

rocket · July 30, 2009, 11:36

Thank you for answering me. Could tell me explicitly about CGNS?

Actually, I don't understand why in using femtime as a solver the fem.sol object doesn't contain a list of mesh points, which correspond to the u value list. This will make life much easier ...

Vasilis · July 31, 2009, 05:45

You could search for CGNS on google. I do not know much about comsol, and I might not be able to assist you. I know that Ansys can export the results in this CGNS format. I thought that maybe comsol can do the same, or maybe comsol can export them in another but user-friendly format.

July 30, 2009, 07:37	Comsol question	#1
rocket New Member Join Date: Mar 2009 Posts: 6 Rep Power: 17	Hi, I used Comsol to solve a PDE problem. I know that the solution is stored in the object fem.sol.u and the unstructured mesh points are stored in fem.mesh.p. If we assume fem.sol.u is a matrix of M*N (M is the number of spatial mesh points, and N is that for the time steps), then the fem.mesh.p should also have the dimension of M. Unfortunately, the mapping between index of p and u is not specified. Could anyone tell me how to do? Thanks. Windson

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July 30, 2009, 11:19		#2
Vasilis New Member Join Date: Apr 2009 Posts: 17 Rep Power: 17	You may never find how to do the mapping. One possible solution to your problem is to check if Comsol can export the solution in a different format, i.e., CGNS

July 30, 2009, 11:36		#3
rocket New Member Join Date: Mar 2009 Posts: 6 Rep Power: 17	Thank you for answering me. Could tell me explicitly about CGNS? Actually, I don't understand why in using femtime as a solver the fem.sol object doesn't contain a list of mesh points, which correspond to the u value list. This will make life much easier ...

July 31, 2009, 05:45		#4
Vasilis New Member Join Date: Apr 2009 Posts: 17 Rep Power: 17	You could search for CGNS on google. I do not know much about comsol, and I might not be able to assist you. I know that Ansys can export the results in this CGNS format. I thought that maybe comsol can do the same, or maybe comsol can export them in another but user-friendly format.