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**Convergence of a Godunov scheme to an Audusse-Perthame adapted entropy solution for conservation laws with BV spatial flux.**
*(English)*
Zbl 1451.65107

Summary: In this article we consider the initial value problem for a scalar conservation law in one space dimension with a spatially discontinuous flux. There may be infinitely many flux discontinuities, and the set of discontinuities may have accumulation points. Thus the existence of traces cannot be assumed. In [E. Audusse and B. Perthame, Proc. R. Soc. Edinb., Sect. A, Math. 135, No. 2, 253–266 (2005; Zbl 1071.35079)] proved a uniqueness result that does not require the existence of traces, using adapted entropies. We generalize the Godunov-type scheme of Adimurthi et al. [SIAM J. Numer. Anal. 42, No. 1, 179–208 (2004; Zbl 1081.65082)] for this problem with the following assumptions on the flux function, (i) the flux is BV in the spatial variable and (ii) the critical point of the flux is BV as a function of the space variable. We prove that the Godunov approximations converge to an adapted entropy solution, thus providing an existence result, and extending the convergence result of Adimurthi, Jaffré and Gowda.

### MSC:

65M06 | Finite difference methods for initial value and initial-boundary value problems involving PDEs |

65M12 | Stability and convergence of numerical methods for initial value and initial-boundary value problems involving PDEs |

35L65 | Hyperbolic conservation laws |

35B44 | Blow-up in context of PDEs |

35A01 | Existence problems for PDEs: global existence, local existence, non-existence |

65M08 | Finite volume methods for initial value and initial-boundary value problems involving PDEs |

76M20 | Finite difference methods applied to problems in fluid mechanics |

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\textit{S. S. Ghoshal} et al., Numer. Math. 146, No. 3, 629--659 (2020; Zbl 1451.65107)

### References:

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