Menu

Discussion Forum

New Discussion
Filtern

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.

Simulation cauchy cube

Posted 16.05.2015, 02:43 GMT-4 Structural Mechanics 2 Replies

Alessandro Sitta
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi,
I try to simulate the deformation of a simple cube without any boundary conditions but in static equilibrum( sum of resulting force and moments are zero, for example applying two forces equals and opposites on two opposite faces of cube ).
The simulation doesn't work for error in convergence, as the system is not in equilibrium, while really it is in equilibrium (it hasn't any DOF).
Could anybody help me?

Thanks,
Alessandro Sitta
2 Replies Last Post 16.05.2015, 08:22 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 9 years ago 16.05.2015, 06:13 GMT-4
Hi
What you are trying to do is feasible in theory, but hardy feasible with the numerical representation of number in our computers, the rounding errors will make small differences and your cube will start spinning or moving => hence a the convergence error.

The easiest with a cube is to study 1/8 and use 3 symmetry planes, and apply only one force that, by symmetry will by applied exactly from the other side (in 2D its 1/4 with 2 symmetry planes)

--
Good luck
Ivar
Hi What you are trying to do is feasible in theory, but hardy feasible with the numerical representation of number in our computers, the rounding errors will make small differences and your cube will start spinning or moving => hence a the convergence error. The easiest with a cube is to study 1/8 and use 3 symmetry planes, and apply only one force that, by symmetry will by applied exactly from the other side (in 2D its 1/4 with 2 symmetry planes) -- Good luck Ivar
Alessandro Sitta
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 9 years ago 16.05.2015, 08:22 GMT-4
1/8 th model works perfectly!

Thanks for the help,

Alessandro
1/8 th model works perfectly! Thanks for the help, Alessandro

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content