Preprint 1999-007

Stability of a Resonant System of Conservation Laws Modeling Polymer Flow with Gravitation

Christian Klingenberg and Nils Henrik Risebro

Abstract: We prove $L^1$ uniqueness and stabiltity for a resonant $2\times 2$ system of conservation laws that arise as a model for two phase polymer flow in porous media. The analysis uses the equivalence of the Eulerian and Lagrangian formulation of this system, and the results are first established for an auxiliary scalar equation. Our methods are based on front tracking approximations for the auxiliary equation, and the Kru\v{z}kov entropy condition for scalar conservation laws.

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Christian Klingenberg, <>
Nils Henrik Risebro, <>
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<> March 10 1999.

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