Metasurfaces, a common type of vertically multilayered heterogeneous structure, effectively modulate elastic wave propagation by controlling its phase and magnitude. Simulation of the relationship between geometric design parameters and wave phase is crucial for elastic metasurface design, but it typically demands large-scale parametric sweeps in 3D numerical simulations, leading to high computational costs. To accelerate the computation, this work proposes a general Numerical Mode Matching (NMM) method for elastic/acoustic wave propagation in vertically multilayered heterogeneous structures. The method decomposes a complex 3D problem into a series of 2D inhomogeneous waveguide eigenvalue problems, solved using the spectral element method (SEM), and a 1D layered medium problem solved analytically using a recursive procedure. The formulation ensures the continuity of displacement and traction at layer interfaces, incorporating solid-fluid coupling with linear-slip boundary conditions. The efficiency and accuracy of the proposed NMM method are demonstrated through several numerical examples. Additionally, a 3D metasurface based on a solid-fluid coupled multilayered resonant unit cell is designed using the NMM method, showcasing its capability to enable functionalities such as wave steering and focusing. The results indicate that the proposed method significantly reduces computational costs while maintaining high accuracy, making it a powerful tool for simulating elastic waves in multilayered heterogeneous structures, particularly in metasurface design.
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