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 The information provided may be out of date.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.

type of the solver

Please login with a confirmed email address before reporting spam

Hello,

I'm simulating a flow in a 2D domain (a square wich contains a small hole).
The governing equations are (N-S and mass conservation) and the boundary conditions are :
- non slip BC (Dirichlet) around the hole
- neumann BC on the outer edges
- periodicity (vertical and horizontal) of the 2 components of the velocity and the pressure
- the pressure = 0 in the point (0,0)
- I have also a pressure gradient (a unit vector : teta=22.5 degree)
To resolve my problem, I use a general PDE.

I'm doing the simulations with Comsol 3.5 and Comsol 4.2a.
My problem is that the model constructed by Comsol 3.5 doesn't converge when I run it on 4.2a.
I have tried to change the properties of my solver on Comsol 4.2a and I got a result but it is not the same with that obtained by 3.5.

please find here attached the 2 Comsol files.


0 Replies Last Post Nov 9, 2012, 10:59 a.m. EST
COMSOL Moderator

Hello M A

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.

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.