# Entropy formulation of degenerate parabolic equation with zero-flux boundary condition

Abstract : We consider the general degenerate hyperbolic-parabolic equation: $$\label{E}\tag{E} u_t+\div f(u)-\Delta\phi(u)=0 \mbox{ in } Q = (0,T)\times\Omega,\;\;\;\; T>0,\;\;\;\Omega\subset\mathbb R^N ;$$ with initial condition and the zero flux boundary condition. Here $\phi$ is a continuous non decreasing function. Following [B\"{u}rger, Frid and Karlsen, J. Math. Anal. Appl, 2007], we assume that $f$ is compactly supported (this is the case in several applications) and we define an appropriate notion of entropy solution. Using vanishing viscosity approximation, we prove existence of entropy solution for any space dimension $N\geq 1$ under a partial genuine nonlinearity assumption on $f$. Uniqueness is shown for the case $N=1$, using the idea of [Andreianov and Bouhsiss, J. Evol. Equ., 2004], nonlinear semigroup theory and a specific regularity result for one dimension.
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Contributor : Mohamed Karimou Gazibo <>
Submitted on : Thursday, October 4, 2012 - 9:29:34 PM
Last modification on : Thursday, December 26, 2019 - 12:00:08 PM
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Boris Andreianov, Mohamed Karimou Gazibo. Entropy formulation of degenerate parabolic equation with zero-flux boundary condition. Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, Wiley-VCH Verlag, 2013, 164 (5), pp. 1471-1491. ⟨10.1007/s00033-012-0297-6⟩. ⟨hal-00697593v2⟩

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