5 research outputs found
Solutions of the Aw-Rascle-Zhang system with point constraints
We revisit the entropy formulation and the wave-front tracking construction of physically admissible solutions of the Aw-Rascle and Zhang (ARZ) " second-order " model for vehicular traffic. A Kruzhkov-like family of entropies is introduced to select the admissible shocks. This tool allows to define rigorously the appropriate notion of admissible weak solution and to approximate the solutions of the ARZ model with point constraint. Stability of solutions w.r.t. strong convergence is justified. We propose a finite volumes numerical scheme for the constrained ARZ, and we show that it can correctly locate contact discontinuities and take the constraint into account
Lack of BV bounds for approximate solutions to a two-phase transition model arising from vehicular traffic
We consider wave-front tracking approximate solutions to a two-phase transition model for vehicular traffic. We construct an explicit example showing that the total variation in space of the solution blows up in finite time even for an initial datum with bounded total variation
Entropy solutions for a traffic model with phase transitions
In this paper, we consider the two phases macroscopic traffic model
introduced in [P. Goatin, The Aw-Rascle vehicular traffic flow with phase
transitions, Mathematical and Computer Modeling 44 (2006) 287-303]. We first
apply the wave-front tracking method to prove existence and a priori bounds for
weak solutions. Then, in the case the characteristic field corresponding to the
free phase is linearly degenerate, we prove that the obtained weak solutions
are in fact entropy solutions \`a la Kruzhkov. The case of solutions attaining
values at the vacuum is considered. We also present an explicit numerical
example to describe some qualitative features of the solutions