Communications in Mathematical Physics

, Volume 186, Issue 3, pp 701–730 | Cite as

Initial Boundary Value Problem for Conservation Laws

  • Pui Tak Kan
  • Marcelo M. Santos
  • Zhouping Xin


This paper concerns the initial boundary value problems for some systems of quasilinear hyperbolic conservation laws in the space of bounded measurable functions. The main assumption is that the system under study admits a convex entropy extension. It is proved that then any twicely differentiable entropy fluxes have traces on the boundary if the bounded solutions are generated by either Godunov schemes or by suitable viscous approximations. Furthermore, in the case that the weak interior solutions are generated by Godunov schemes, any Lipschitz continuous entropy fluxes corresponding to convex entropies have traces on the boundary and the traces are bounded above by computable numerical boundary values. This in particular gives a trace formula for the flux functions in terms of the numerical boundary data. We also investigate the formulation of boundary conditions for systems of hyperbolic conservation laws. It is shown that the set of expected boundary values derived from the viscous approximation contains the one derived in terms of the boundary Riemann problems, and the converse is not true in general. The general theory is then applied to some specific examples. First, several new facts are obtained for convex scalar conservation laws. For example, we give example which show that Godunov schemes produce numerical boundary layers. It is shown that any continuous functions of density have traces on the boundary (instead of only entropy fluxes). We also obtain interior and boundary regularity of the weak solutions for bounded measurable initial and boundary data. A generalized Oleinik entropy condition is also obtained. Next, we prove the existence of a weak solution to the initial-boundary value problem for a family of × quadratic system with a uniformly characteristic boundary condition.


Weak Solution Boundary Data Riemann Problem Initial Boundary Trace Formula 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Pui Tak Kan
    • 1
  • Marcelo M. Santos
    • 2
  • Zhouping Xin
    • 3
  1. 1.Department of Mathematics, IUPUIUS
  2. 2.Departamento de Matemática, IMECC–UNICAMPUS
  3. 3.Courant Institute of Mathematical Sciences, New York Universtiy and Department of Mathematics, Harvard UniversityUS

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