Acoustic Metamaterial COMSOL Analysis

I need to quantify the imaginary (complex-valued) band gaps of an acoustic metamaterial I am designing in COMSOL Multiphysics. The structure is strictly periodic, and the goal is to validate that it delivers both precise sound-wave control and high sound-insulation performance. The study must cover: • Setting up the unit-cell geometry with Bloch-Floquet boundary conditions, • Running an eigenfrequency or wave eigenvalue study across the first Brillouin zone, • Extracting real and imaginary parts of the dispersion relation, clearly indicating stop-bands, • Providing plots, data tables, and a concise explanation of how the gaps relate to sound-wave attenuation. Acceptance criteria – Model solves without errors on COMSOL 6.x standard licensing. – Dispersion plots show an imaginary band gap within the audible range we discuss. – Documentation is clear enough for a graduate-level user to rerun the simulation from scratch. Feel free to suggest practical mesh strategies, solver settings, or parametric sweeps that could sharpen the results while keeping computation times reasonable.

Project ID: 39737620