Improved Numerical Method for Aw-Rascle Type Continuum Traffic Flow Models

Improved Numerical Method for Aw-Rascle Type Continuum Traffic Flow Models

Mohammadian, Saeed (Queensland University of Technology)
van Wageningen-Kessels, F.L.M. (TU Delft Transport and Planning; German University of Technology in Oman)

2018-01-01

Continuum traffic flow models are essentially nonlinear hyperbolic systems of partial differential equations. Except for limited specific cases, these systems must be solved numerically. Mathematical structure of continuum models can be different for each class of models. As a result, suitable numerical schemes for some classes may not be efficient for others. In this study, an improved numerical method is proposed for a class of second-order traffic flow models. The method is based on McCormack scheme, which is a widely-used method for non-homogeneous second-order traffic flow models, but fails to produce reasonable results for homogeneous models including Aw-Rascle type models which are the focus of this paper. It is shown that this is mainly due to spurious numerical oscillations. Smoothing methods to overcome these issues are studied and applied. Central dispersion and artificial viscosity (AV) methods are incorporated into the standard McCormack scheme and tested. To reduce numerical diffusion, a total variation diminishing Runge-Kutta time stepping scheme is applied. Results show the capability of the proposed methods, and especially the AV method, to eliminate the oscillations of the standard McCormack scheme as well as controlling numerical diffusion.

http://resolver.tudelft.nl/uuid:44e073da-92f0-4489-acc0-c31f4f3baa1e

https://doi.org/10.1177/0361198118784402

2019-08-01

0361-1981

Transportation Research Record, 2672 (20), 262-276

Institutional Repository

journal article

© 2018 Saeed Mohammadian, F.L.M. van Wageningen-Kessels