Hello,
I’m trying to calculate hex PhC waveguide - bandstructure and group velocity but cannot find the source of the convergence problem. Still, I could get a reasonable band structure
But I cannot get the group velocity because of convergence. I tried to change boundaries, mesh, but I have very limited computer power, so maybe it was not enough to see the difference. Could you help me to find the problem? Please, find my file here: https://www.dropbox.com/s/k8uaiir689ftiao/3D_PhC_Bandstructure.fsp?dl=0
Thanks in advance, Irina