no. 6
On the role of numerical viscosity in the study of the local limit of nonlocal conservation laws
ESAIM: Mathematical Modelling and Numerical Analysis , Tome 55 (2021) no. 6, pp. 2705-2723

We deal with the numerical investigation of the local limit of nonlocal conservation laws. Previous numerical experiments seem to suggest that the solutions of the nonlocal problems converge to the entropy admissible solution of the conservation law in the singular local limit. However, recent analytical results state that (i) in general convergence does not hold because one can exhibit counterexamples; (ii) convergence can be recovered provided viscosity is added to both the local and the nonlocal equations. Motivated by these analytical results, we investigate the role of numerical viscosity in the numerical study of the local limit of nonlocal conservation laws. In particular, we show that Lax–Friedrichs type schemes may provide the wrong intuition and erroneously suggest that the solutions of the nonlocal problems converge to the entropy admissible solution of the conservation law in cases where this is ruled out by analytical results. We also test Godunov type schemes, less affected by numerical viscosity, and show that in some cases they provide an intuition more in accordance with the analytical results.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1051/m2an/2021073
Classification : 35L65, 65M12
Keywords: Numerical viscosity, nonlocal conservation law, nonlocal traffic models, nonlocal-to-local limit 
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     title = {On the role of numerical viscosity in the study of the local limit of nonlocal conservation laws},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {2705--2723},
     year = {2021},
     publisher = {EDP-Sciences},
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Colombo, Maria; Crippa, Gianluca; Graff, Marie; Spinolo, Laura V. On the role of numerical viscosity in the study of the local limit of nonlocal conservation laws. ESAIM: Mathematical Modelling and Numerical Analysis , Tome 55 (2021) no. 6, pp. 2705-2723. doi: 10.1051/m2an/2021073

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