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A Mixed Variational Formulation for the Wellposedness and Numerical Approximation of a Pde Model Arising in a 2-D Fluid-Fluid Interaction

Paula J Egging, University of Nebraska - Lincoln

Abstract

This work presents qualitative and numerical results on a system of partial differential equations (PDEs) which models certain fluid-fluid interaction dynamics. This system models a compressible fluid in a domain Ω+ ⊂ R 2 coupled to an incompressible fluid modeled by Stokes flow in domain Ω− ⊂ R 2 , with the strong coupling implemented through certain boundary conditions on the shared interface, Γ. Chapter 1 establishes the wellposedness of this system by means of constructing for it a semigroup generator representation. This representation is accomplished by eliminating one of the pressure variables via identifying it as the solution of a certain boundary value problem, while the wellposedness is established via a nonstandard usage of the Babuska-Brezzi Theorem. In Chapter 2, we demonstrate how the constructive proof of wellposedness in Chapter 1 naturally lends itself to a certain finite element method (FEM), by which to numerically approximate solutions of the given coupled PDE system. This FEM is provided with error estimates and associated rates of convergence. In addition, a test problem is considered and numerically solved by means of said FEM.

Subject Area

Applied Mathematics|Mathematics

Recommended Citation

Egging, Paula J, "A Mixed Variational Formulation for the Wellposedness and Numerical Approximation of a Pde Model Arising in a 2-D Fluid-Fluid Interaction" (2022). ETD collection for University of Nebraska - Lincoln. AAI29999298.
https://digitalcommons.unl.edu/dissertations/AAI29999298

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