A fully averaged poroelastic Kirchhoff plate interacting with an incompressible, viscous fluid: analysis and numerical simulation
We study a new fully averaged poroelastic Kirchhoff plate model coupled with the flow of an incompressible, viscous fluid governed by the time-dependent Stokes equations. The fully averaged formulation offers several advantages over the classical Biot poroelastic plate model: both elastodynamic and pressure equations are posed on a codimension-one interface, the resulting numerical schemes are simpler to implement and computationally more efficient, and the fluid-structure coupling is more natural. We analyze a linearly coupled fluid-structure interaction problem with kinematic and dynamic interface conditions enforcing continuity of normal velocities, the Beavers-Joseph-Saffman slip in the tangential velocities, and balance of forces between the fluid and the poroelastic structure. We establish the existence of weak solutions using energy methods, and then prove global-in-time existence of a unique strong solution to a regularized version of the problem using sectoriality of the associated spatial operator and maximal $\mathrm{L}^p$-regularity of the resulting Cauchy problem. For data with exponential decay, we prove exponential decay of solutions. Finally, we develop a finite element method for the numerical approximation of the coupled system and show that it provides an excellent approximation of the full Biot-Stokes system in the thin-structure regime. The main advantage of this model lies in the remarkably simple implementation, as the poroelastic plate equations constitute a surface model bounding a bulk fluid domain. These results provide a rigorous analytical and computational framework for the study of coupled fluid-poroelastic structure interactions involving thin poroelastic interfaces modeled by the fully averaged Kirchhoff poroelastic plate equations.