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On the Conditions for Coupling Free Flow and Porous-Medium Flow in a Finite Volume Framework

  • Thomas Fetzer
  • Christoph Grüninger
  • Bernd Flemisch
  • Rainer Helmig
Conference paper
Part of the Springer Proceedings in Mathematics & Statistics book series (PROMS, volume 200)

Abstract

This article presents model concepts for the coupling of one-phase compositional non-isothermal Navier-Stokes flow to two-phase compositional non-isothermal Darcy flow in a finite volume framework. The focus of the presented coupling conditions is on defining appropriate conditions for momentum transfer without introducing additional degrees of freedom at the interface. Four different methods are presented and compared with the help of numerical simulations of flow around an evaporating porous medium. The results show that simply assigning the porous medium gas pressure as the gas pressure at the interface (CM1) leads to high, non-physical velocities in cells at the corner of the porous medium. This effect can be weakened by recalculating the interface gas pressure with the help of the total mass balance and additional assumptions concerning the state at the interface (CM2). Allowing only momentum transfer between the gas phases (CM3) leads to an increase of the resistance against inflow, if the porous medium is filled with water. However, in order to minimize the assumptions made, an additional system of equations can be introduced and solved to recalculate the pressure at the interface (CM4). This method is computationally more expensive but shows the expected physical behavior regarding the velocity profile.

Keywords

Free flow Porous-medium flow Coupling 

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Thomas Fetzer
    • 1
  • Christoph Grüninger
    • 1
  • Bernd Flemisch
    • 1
  • Rainer Helmig
    • 1
  1. 1.Universität StuttgartStuttgartGermany

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