SFB 1313 Publication "Analysis of the Stokes-Darcy problem with generalised interface conditions"

New SFB 1313 publication (University of Stuttgart), published in ESAIM: Mathematical Modelling and Numerical Analysis (ESAIM: M2AN). The paper has been developed in the framework of SFB 1313 research project A03.

"Analysis of the Stokes-Darcy problem with generalised interface conditions"

Authors

• Elissa Eggenweiler (University of Stuttgart, SFB 1313 research project A03)
• Marco Discacciati (Loughborough University, Mathematical Sciences)
• Iryna Rybak (University of Stuttgart, SFB 1313 research project A03)

Abstract

Fluid flows in coupled systems consisting of a free-flow region and the adjacent porous medium appear in a variety of environmental settings and industrial applications. In many applications, fluid flow is non-parallel to the fluid–porous interface that requires a generalisation of the Beavers–Joseph coupling condition typically used for the Stokes–Darcy problem. Generalised coupling conditions valid for arbitrary flow directions to the interface are recently derived using the theory of homogenisation and boundary layers. The aim of this work is the mathematical analysis of the Stokes–Darcy problem with these generalised interface conditions. We prove the existence and uniqueness of the weak solution of the coupled problem. The well-posedness is guaranteed under a suitable relation-ship between the permeability and the boundary layer constants containing geometrical information about the porous medium and the interface. We study the validity of the obtained results for realistic problems numerically and provide a benchmark for numerical solution of the Stokes–Darcy problem with generalised interface conditions.