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Commulative integrals
Posted 30.09.2009, 07:36 GMT-4 1 Reply
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Hi,
In the old COMSOL there used to be a "quad" command for computing integrals, with specific boundaries, on a subdomain for instance. In COSMOL 3.5a that's gone, and you can now only compute entire subdomain integrals.
Is there some way to still compute these without going to MATLAB?
I found that you can get somewhat what you want by making an integral coupling variable:
int_c = c*(x<dest(x))
but the result is "chappy" and "wavy" for some reason.... Any help would be greatly appreciated.
In the old COMSOL there used to be a "quad" command for computing integrals, with specific boundaries, on a subdomain for instance. In COSMOL 3.5a that's gone, and you can now only compute entire subdomain integrals.
Is there some way to still compute these without going to MATLAB?
I found that you can get somewhat what you want by making an integral coupling variable:
int_c = c*(x<dest(x))
but the result is "chappy" and "wavy" for some reason.... Any help would be greatly appreciated.
1 Reply Last Post 30.09.2009, 10:59 GMT-4
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Posted:
2 decades ago
Hi
I find it difficult to understand what your are really attempting to do, is it possible to give us a simple example
int_u = u*(x<1) should work, but is this really what you want ?
My way around when integrating over partial sub-domains (or surfaces for 3D) is to split the 3D surface with m CD tool and then select only the part of interest.
See also te discussion startd by Noemi Petra on "exporting data from the boundary"
Good luck
Ivar
I find it difficult to understand what your are really attempting to do, is it possible to give us a simple example
int_u = u*(x<1) should work, but is this really what you want ?
My way around when integrating over partial sub-domains (or surfaces for 3D) is to split the 3D surface with m CD tool and then select only the part of interest.
See also te discussion startd by Noemi Petra on "exporting data from the boundary"
Good luck
Ivar