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On backward Euler approximations for systems of conservation laws

  • Maria Teresa Chiri,
  • Minyan Zhang

摘要

We study approximate solutions to a hyperbolic system of conservation laws, constructed by a backward Euler scheme, where time is discretized while space is still described by a continuous variable \(x\in {\mathbb R}\) x R . We prove the global existence and uniqueness of these approximate solutions, and the invariance of suitable subdomains. Furthermore, given a left and a right state \(u_l, u_r\) u l , u r connected by an entropy-admissible shock, we construct a traveling wave profile for the backward Euler scheme connecting these two asymptotic states in two main cases. Namely: (1) a scalar conservation law, where the jump \(u_l-u_r\) u l - u r can be arbitrarily large, and (2) a strictly hyperbolic system, assuming that the jump \(u_l-u_r\) u l - u r occurs in a genuinely nonlinear family and is sufficiently small.