Hello, I am doing some elastic wave simulations using solid mechanics module and piezoelectric module. And sometimes the DOF of my models are quite large so that I have to choose the solver manually to save memory and time. I have read the Comsol Multiphysics Reference Guide and realized that the choice of the best solver is depend on the type of the equation.
Here is my situation: I use Floquet-type periodic BC in eigenfrequency study and PML in frequency domain analysis very often, and because my lack of mathematical knowledge I don't know whether the problem is positive definite or not under these kind of boundary settings. (They are not ordinary boundaries that appear in my math textbooks) So could anyone please help me? Thanks!
Here is my situation: I use Floquet-type periodic BC in eigenfrequency study and PML in frequency domain analysis very often, and because my lack of mathematical knowledge I don't know whether the problem is positive definite or not under these kind of boundary settings. (They are not ordinary boundaries that appear in my math textbooks) So could anyone please help me? Thanks!