Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
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.
Problems computing the volume change of a domain
Posted Mar 27, 2012, 8:34 p.m. EDT Parameters, Variables, & Functions, Results & Visualization, Structural Mechanics Version 4.2 0 Replies
Please login with a confirmed email address before reporting spam
I'm modelling a pressurized sphere within an elastic domain, in 2D axi-symmetric Structural Mechanics (v4.2). I'm trying to check the volume change of the sphere.
There are analytic solutions available when the sphere is a cavity so I have set a E_sphere=1 Pa and I have tried several of the methods that were already mentioned in some of the threads in the forum:
-> 1) in Results / Volume integration - expression (1) of the sphere with frame Material / Spatial and calculate the difference
-> 2) same as above with Results / Surface integration - expression (1) of the 'sphere' with "compute volume integral"
-> 3) in Results / Line integration - expression 'solid.disp' of the boundary of the sphere with "compute surface integral"
This option should -as far as I understood- give me the volume change of the sphere directly (please correct me if I'm wrong)
My problem is that there is still quite a lot of discrepancies between this method, even when I'm trying to refine the mesh. The second method (with surface integration) is the best but there is still ~25% error with the analytical result ! Am I doing something wrong ??
What method would you recommend to calculate the change in volume of a domain in 2D axisym. ??
Thanks a lot !
Karen
Hello Karen Pascal
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.