Vanishing viscosity solutions for conservation laws with regulated flux

Abstract In this paper we introduce a concept of “regulated function” v ( t , x ) of two variables, which reduces to the classical definition when v is independent of t. We then consider a scalar conservation law of the form u t + F ( v ( t , x ) , u ) x = 0 , where F is smooth and v is a regulated function, possibly discontinuous w.r.t. both t and x. By adding a small viscosity, one obtains a well posed parabolic equation. As the viscous term goes to zero, the uniqueness of the vanishing viscosity limit is proved, relying on comparison estimates for solutions to the corresponding Hamilton–Jacobi equation. As an application, we obtain the existence and uniqueness of solutions for a class of 2 × 2 triangular systems of conservation laws with hyperbolic degeneracy.

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