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Fluid-solid coupled SBPML for infinite transient wave problems
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DOI：10.1016/j.compgeo.2026.108203.png)
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Abstract
En 中文
The accurate treatment of infinite-domain boundary conditions, especially at fluid–solid coupled interfaces, remains a critical issue in the numerical simulation of coupled wave propagation in unbounded domains. This study presents a novel time-domain fluid–solid coupled scaled boundary perfectly matched layer (SBPML) for the simulation of wave propagation in unbounded fluid–solid coupled media. The proposed SBPML enables a consistent treatment of fluid–solid interface and free-surface conditions, ensuring perfect transmission of outgoing interface waves and surface waves. To achieve this, a modified scaled boundary coordinates system is first introduced to describe the geometric characteristics of fluid–solid coupled domain. A unified coordinate stretching strategy is applied along the radial direction of the scaled boundary coordinates across the whole computational domain, avoiding numerical instabilities induced by inconsistent scaling and attenuation of interface conditions. This treatment is shown to be essential for accurately modeling interface-guided wave propagation and preventing spurious reflections in the coupled systems. The resulting formulation is a system of second-order ordinary differential equations with respect to time, facilitating straightforward coupling with interior finite element models. The feasibility and accuracy of the proposed approach are demonstrated through three benchmark tests involving wave problems in fluid–solid coupled unbounded domains featuring irregular interfacial geometries and heterogeneous solid media. Finally, the robustness and practical performance of the proposed method are validated using a regional-scale offshore seismic wave propagation problem excited by fault dislocation.
Keywords:
fluid–solid coupling
scaled boundary perfectly matched layer
wave propagation
infinite-domain boundary conditions
numerical simulation
Journal
IF:
6.2
Papers:
7.0K
Citations:
2.9W
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