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arXiv · 2605.15007

Weak Solutions and Inertial Limits for Quasi-static Filtrations

Peter Lavagnino·Arum Lee·Justin T. Webster
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Abstract

A quasi-static filtration system, comprising a poroelastic solid coupled to an incompressible free-flow, is considered in 3D. Across a flat 2D interface, the Beavers-Joseph-Saffman coupling conditions are taken. The system constitutes a doubly elliptic-parabolic coupling and can be seen as a degenerate case of the inertial Biot-Stokes dynamics. These dynamics cannot be easily recovered by simply sending the inertial parameters to zero; however, inserting a viscoelastic regularization of the inertial Biot system allows us to construct weak solutions in the inertial limit. Subsequently, we can pass to the limit in the regularization parameter to obtain quasi-static weak solutions. This addresses an open singular/degenerate limiting problem in the class of filtration models, and permits future analyses of uniqueness and regularity of solutions. This linear construction also provides a foundation for the later incorporation of physically-motivated nonlinear poroelastic effects via fixed point methods.

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Peter Lavagnino, Arum Lee, Justin T. Webster. 2026-05-14. Weak Solutions and Inertial Limits for Quasi-static Filtrations. https://arxiv.org/abs/2605.15007

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