A time dependent Stokes interface problem: well-posedness and space-time finite element discretization
ESAIM: Mathematical Modelling and Numerical Analysis , Tome 52 (2018) no. 6, pp. 2187-2213.

In this paper a time dependent Stokes problem that is motivated by a standard sharp interface model for the fluid dynamics of two-phase flows is studied. This Stokes interface problem has discontinuous density and viscosity coefficients and a pressure solution that is discontinuous across an evolving interface. This strongly simplified two-phase Stokes equation is considered to be a good model problem for the development and analysis of finite element discretization methods for two-phase flow problems. In view of the unfitted finite element methods that are often used for two-phase flow simulations, we are particularly interested in a well-posed variational formulation of this Stokes interface problem in a Euclidean setting. Such well-posed weak formulations, which are not known in the literature, are the main results of this paper. Different variants are considered, namely one with suitable spaces of divergence free functions, a discrete-in-time version of it, and variants in which the divergence free constraint in the solution space is treated by a pressure Lagrange multiplier. The discrete-in-time variational formulation involving the pressure variable for the divergence free constraint is a natural starting point for a space-time finite element discretization. Such a method is introduced and results of numerical experiments with this method are presented.

Reçu le :
Accepté le :
DOI : 10.1051/m2an/2018053
Classification : 76M10, 76T10, 76D07
Mots clés : Two-phase Stokes equations, space-time variational saddle point formulation, well-posed operator equation, XFEM, DG
Voulis, Igor 1 ; Reusken, Arnold 1

1
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     title = {A time dependent {Stokes} interface problem: well-posedness and space-time finite element discretization},
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Voulis, Igor; Reusken, Arnold. A time dependent Stokes interface problem: well-posedness and space-time finite element discretization. ESAIM: Mathematical Modelling and Numerical Analysis , Tome 52 (2018) no. 6, pp. 2187-2213. doi : 10.1051/m2an/2018053. http://archive.numdam.org/articles/10.1051/m2an/2018053/

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