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.
Boundary conditions (PDE general form) + high order PDE
Posted 20 avr. 2010, 09:09 UTC−4 0 Replies
Please login with a confirmed email address before reporting spam
I would like to solve in 1D a non-linear differential equation of order 2. I use a PDE general form with the following settings (one variable c):
Gamma = -3*(1+theta*c)*cx
F = theta*cx^2-3*theta*cx
ea = 0
da = 1
Is it possible to put F equal to high order derivatives (for example to put F=cxxxx)?
Moreover I have the following boundary conditions:
Gamma must be constant at the boundary 2: for this purpose I use a Newmann boundary condition with G = constant. Is that correct?
At the boundary 1, the derivative of c must be equal to zero. That why I set the weak term beeing equal to 'test(cx)'. Is that the correct way to obtain the derivative beeing equal to zero at the boundary 1? Why is it not possible to turn off the coefficient boundary conditions (Neumann and Dirichlet)?
Thank a lot in advance for your help.
Magalie Huttin
Hello Magalie Huttin
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.