Menu

Discussion Forum

New Discussion
Filtern

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 The information provided may be out of date.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.

Switch the boundary condition from flux to pressure head (Richards’Equation)

Posted 03.03.2013, 02:52 GMT-5 Version 4.3, Version 4.3a 0 Replies

Andy Huang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

I read some paper, in the old version of COMSOL, we can choose a Mixed boundary condition (mix of Dirichlet, Newman and Cauchy conditions). in order to automatically transfer the boundary condition form pressure head to Flux, or Flux to pressure head.

But in the new version of COMSOL 4.2 or 4.3, I can not found that kind of setting,we would like to know how to switch the boundary condition from flux to pressure head during the calculation. We started from a flux boundary for rainfall infiltration (with negative pressure head), and when the pressure head at the surface boundary becomes positive, we would like to swith it to the pressure head boundary. We have no idea how to implement it in COMSOL4.3(Richards’Equation).

Could any expert have some suggestion? I appreciate for your help.
0 Replies Last Post 03.03.2013, 02:52 GMT-5
COMSOL Moderator

Hello Andy Huang

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.

Suggested Content