## Preprint 2022-25

## Raimund Bürger, Harold D. Contreras, Luis M. Villada:

### A Hilliges-Weidlich-type scheme for a one-dimensional scalar conservation law with nonlocal flux

### Abstract:

The simulation model proposed in [M. Hilliges and W. Weidlich. A phenomenological model for dynamic traffic flow in networks. Transportation Research Part B: Methodological, 29(6):407-431, 1995] can be understood as a simple method for approximating solutions of scalar conservation laws whose flux is of density times velocity type, where the density and velocity factors are evaluated on neighboring cells. The resulting scheme is monotone and converges to the unique entropy solution of the underlying problem. The same idea is applied to devise a numerical scheme for a class of one-dimensional scalar conservation laws with nonlocal flux and initial and boundary conditions. Uniqueness of entropy solutions to the nonlocal model follows the from Lipschitz continuous dependence of a solution on initial and boundary data. By various uniform estimates, namely a maximum principle and bounded variation estimates, along with a discrete entropy inequality, the sequence of approximate solutions is shown to converge to an entropy weak solution of the nonlocal problem. The improved accuracy of the proposed scheme in comparison to schemes based on the Lax-Friedrichs flux is illustrated by numerical examples. A second-order scheme based on MUSCL methods is presented.

This preprint gave rise to the following definitive publication(s):

**Raimund BüRGER, Harold D. CONTRERAS, Luis M. VILLADA: ***A Hilliges-Weidlich-type scheme for a one-dimensional scalar conservation law with nonlocal flux*. Networks and Heterogeneous Media, vol. 18, pp. 664-693, (2023).