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(a) Schematic of 3D block orientation, excitation plane, and the propagation centerline. The block dimensions are approximately 26.5 mm × 26.5 mm × 30.5 mm along the x, y, and z axes, respectively. (b) Computational meshes of the domain with the infinite boundaries in the FE simulation. (c) Definition of the four neighboring points around each center point on the z axis, less than one-fifth of a wavelength apart in each case.
