Exact and grid-free solutions to the Lighthill–Whitham–Richards traffic flow model with bounded acceleration for a class of fundamental diagrams |
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Institution: | 1. Department of Mechanical Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;2. Department of Electrical Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;1. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Photonics Research Center, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. School of Engineering, KDU University College, Utropolis, Glenmarie, Jalan Kontrator U1/14, Seksyen U1, 40150 Shah Alam, Selangor Darul Ehsan, Malaysia;1. Department of Physics, Calicut University, Malappuram, Kerala 673635, India;2. Department of Physics, Farook College, Calicut University, Kerala 673632, India;3. Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS, Univ. Bourgogne Franche-Comté, 9 Av. A. Savary, B.P. 47870, 21078 Dijon Cedex, France;4. CNRS/Universite Joseph Fourier, Laboratoire Interdisciplinaire de Physique (LIPHY), 38402 Saint-Martin-d’Héres, Grenoble, France |
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Abstract: | In this article, we propose a new exact and grid-free numerical scheme for computing solutions associated with an hybrid traffic flow model based on the Lighthill–Whitham–Richards (LWR) partial differential equation, for a class of fundamental diagrams. In this hybrid flow model, the vehicles satisfy the LWR equation whenever possible, and have a constant acceleration otherwise. We first propose a mathematical definition of the solution as a minimization problem. We use this formulation to build a grid-free solution method for this model based on the minimization of component function. We then derive these component functions analytically for triangular fundamental diagrams, which are commonly used to model traffic flow. We also show that the proposed computational method can handle fixed or moving bottlenecks. A toolbox implementation of the resulting algorithm is briefly discussed, and posted at https://dl.dropbox.com/u/1318701/Toolbox.zip. |
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Keywords: | Macroscopic flow model LWR model Bounded acceleration Moving bottleneck Exact numerical scheme Grid-free numerical scheme |
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