Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Commulative integrals
Posted 30 sept. 2009, 07:36 UTC−4 1 Reply
Please login with a confirmed email address before reporting spam
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 sept. 2009, 10:59 UTC−4
Please login with a confirmed email address before reporting spam
Posted:
1 decade 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