I want to find the dispersion diagram for a periodic cell in Acoustics using Bloch-floquet boundary condition in new version of comsol. As I could not find any manual for this case I searched for the counter part in electromagnetic or photonics but what I found, was the attached manual but as it is for previous versions of comsol it is completely out of use. is it possible to help me find a dispersion diagram for a very simple structure like the figure 2 of the attached manual. No matter the structure be photonics, electromagnetics or phononic.
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