† Solid Mechanics (Elastic Waves) ( ), for modeling elastic waves in solids. † Poroelastic Waves ( ), for precisely mode ling the propagation of sound in a porous material. It includes the two-way coupling between deformation of the solid porous matrix and the pressure waves in the saturating fluid. The. food truck party songs. metallic folded-waveguide slow-wave circuit.The COMSOL Multiphysics finite element software package was utilized because its flexibility enables it to model material properties that are difficult to model with finite difference codes. Analysis and Results To test its accuracy, COMSOL Multiphysics's RF Module. We can use COMSOL Multiphysics to perform a mode analysis.