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.
Non-zero divergence of D and B fields in ewfd Mode Analysis
Posted 2017年9月29日 GMT-4 14:29 Wave Optics Version 5.3 1 Reply
Please login with a confirmed email address before reporting spam
I am solving for the mode of a silicon nanowire. I am interested in the bound current and bound charge distributions within the waveguide, as I would like to evaluate the electromagnetically induced mechanical forces within the structure.
I have investigated the charge and current densities, and was not satisfied with the results. The divergence of the D and B fields is non-zero (attached) -- which is a non-physical result. Refinements to the mesh do not cause these quantities to converge to zero.
The reason the divergences is non-zero is due to the master equation for the Wave Equation physics interface does not require them to be. Is there a way to transform these solutions to satisfy these constraints? Is it possible to constrain the solver to set these quantities to zero?
Hello Warren Jin
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.
Please login with a confirmed email address before reporting spam
I was calculating the divergence incorrectly. The Bz field has no spatial variation in 2D symmetry, the correct expression is:
d(ewfd.Bx,x)+d(ewfd.By,y)+lambda*ewfd.Bz