Submission #263

Submission information
Submitted by Anonyme (not verified)
Thu, 11/09/2017 - 13:23
Internship : Fluid models for urban traffic
For several years, middle-sized and big cities have begun to anticipate their growth and to adapt their services (transport, commodities, work areas, etc.) through an adapted urbanism politics. Numerical simulations play an important role in these reflections for the development of "smart cities". Indeed, the multimodal nature of transportation modes make the evaluation of the impact of a new infrastructure rather complicated.
However, this evaluation is the keypoint for multiple applications, be there about economics (optimise transit times between production or work areas), ecology (limiting C02 emissions) or security (secure a quick access for security squads on the events).
Developing adapted numerical models allows for a better understanding of the main mechanisms of urban mobility.
In particular, traffic on roads my be described using physical models such as those used in fluid mechanics and based on conservation laws. First proposed by Lightill and Witham in 1955, and Richards in 1956, this model accounts for the most recurrent types of behaviors in road traffic. It is a model of compressible fluid mechanics in which shocks and vacuum states account for traffic jams formations and disappearances. We will focus in this work on this kind of models in order to describe the urban traffic after a critical event (such as a fire or an explosion).
A first bibliographical work has already been done at ONERA and adapted traffic models from the literature have been identified. A generic numerical model has also been implemented on test-cases accounting for the main characteristics of a road network : variations of road capacities and existence of cross-roads.
The proposed internship will pursue this work and will begin with a numerical validation of the model using a realistic traffic context defined from measurements given by Campus Trafic (Toulouse Metropole).
Then, we will focus on the possibility to use aircraft-based imagery in order to initialize and correct the numerical simulations. The last part of the internship will then be devoted to the coupling between the urban traffic and crowd models.
Sun, 12/31/2017