Boundary conditions when a pde degenerates to lower order

Please login with a confirmed email address before reporting spam

In a pde module, suppose the default form has a second derivative in space. In the boundary conditions, there are terms related to the first derivatives in space. What if the user sets the coefficient in front of the second derivative in space in the bulk to be zero, then the first derivatives boundary conditions are redundant. How will the software deal with this situation?


Reply

Please read the discussion forum rules before posting.

Please log in to post a reply.

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.