Abstract
The Aw–Rascle–Zhang traffic model, a model of sedimentation, and other applications lead to nonlinear \(2 \times 2\) systems of conservation laws that are governed by a single scalar system velocity. Such systems are of the Temple class since rarefaction wave curves and Hugoniot curves coincide. Moreover, one characteristic field is genuinely nonlinear almost everywhere, and the other is linearly degenerate. Two well-known problems associated with these systems are handled via a random sampling approach. Firstly, Godunov’s and related methods produce spurious oscillations near contact discontinuities since the numerical solution invariably leaves the invariant region of the exact solution. It is shown that alternating between averaging (Av) and remap steps similar to the approach by Chalons and Goatin (Commun Math Sci 5:533–551, 2007) generates numerical solutions that do satisfy an invariant region property. If the remap step is made by random sampling (RS), then combined techniques due to Glimm (Commun Pure Appl Math 18:697–715, 1965), LeVeque and Temple (Trans Am Math Soc 288:115–123, 1985) prove that the resulting Av–RS scheme converges to a weak solution. Numerical examples illustrate that the new scheme is superior to Godunov’s method in accuracy and resolution. Secondly, the vacuum state, which may form even from positive initial data, causes potential problems of non-uniqueness and instability. This is resolved by introducing an alternative Riemann solution concept.
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Acknowledgements
FB and RB acknowledge support by BASAL project CMM, Universidad de Chile and Centro de Investigación en Ingeniería Matemática (CI2MA), Universidad de Concepción; Centro CRHIAM Proyecto Conicyt Fondap 15130015; and Fondef project ID15I10291. In addition, FB is supported by Fondecyt project 1130154, and RB is supported by Fondecyt project 1170473 and Conicyt project Anillo ACT1118 (ANANUM).
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Betancourt, F., Bürger, R., Chalons, C. et al. A random sampling method for a family of Temple-class systems of conservation laws. Numer. Math. 138, 37–73 (2018). https://doi.org/10.1007/s00211-017-0900-z
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DOI: https://doi.org/10.1007/s00211-017-0900-z