Solving System of Differential Equations in COMSOL Multiphysics

[nadam]

I want to solve a system of differential equations in comsol multiphysics.
So far I have not figured out how to enter a 2nd pde in addition to the existing pde.
Is this possible, and how?

 

[PerennialII]

Bit old but perhaps someone else will come across something similar ... if you can't implement the PDE by adding variables to the PDE form (physics --> equation systems, it's able to describe fairly general systems), you can always make your problem a "multiphysics one" by adding a new application mode which describes your another problem.