CFD Aerodynamics of the French High-Speed Train

Aita, Samir; Tabbal, A.; Mestreau, Eric; Montmayeur, Nicole; Masbernat, F.; Wolfhugel, Y.F.; Dumas, Jean-Christophe

doi:10.4271/920343

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…Train around the flow Reynolds number is generally greater than 5x10 5 , that is, around the train in turbulent state. [6][7].…”

Section: Mathematical Modelmentioning

confidence: 99%

Study on Aerodynamic Shape Optimization of Metro Running in the Open Air

Meng¹,

Liu²,

Zhou³

2017

dtetr

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Based on the three-dimensional incompressible Navier-Stokes equations and the standard k~ε two-equation turbulence model, the flow field around the train is simulated numerically in the case of no wind condition. The influence of the head type and the windshield structure on the flow field distribution and the aerodynamic drag coefficient and the lift coefficient are compared and analyzed. The results show that the aerodynamic performance of the streamlined train is better, the resistance of the streamlined train is obviously reduced, especially the first car, tail car resistance decreased significantly, vehicle resistance decreased by 45.9%. The fully enclosed windshield eliminates the flow separation at the windshield and helps to reduce the resistance of the intermediate car, reducing the percentage by 28.6%.

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“…Train around the flow Reynolds number is generally greater than 5x10 5 , that is, around the train in turbulent state. [6][7].…”

Section: Mathematical Modelmentioning

confidence: 99%

Study on Aerodynamic Shape Optimization of Metro Running in the Open Air

Meng¹,

Liu²,

Zhou³

2017

dtetr

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“…From these considerations, it becomes clear that cache-misses are directly linked to the bandwidth of the equivalent matrix system. Point renumbering to reduce bandwidths has been pursued for many years in traditional finite element appIications.l2* l 3 The aim was to reduce the cost of the matrix inversion, which was considered to be the most expensive part of any finite element simulation.…”

Section: Point Renumberingmentioning

confidence: 99%

Some useful renumbering strategies for unstructured grids

Löhner

1993

Numerical Meth Engineering

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SUMMARYSeveral renumbering strategies for unstructured grids are discussed. They lead to a minimization of cache-misses and an optimal grouping of elements for different computer platforms, from superscalar workstations to multiprocessor register-to-register vector machines. Timings for a typical computational fluid dynamics (CFD) code that employs these renumbering strategies indicate that CPU requirements may he halved by applying them. The renumbering strategies discussed are all of linear time complexity, making them ideally suited for applications requiring frequent mesh changes. Furthermore, these renumbering strategies are not only valid for element-based codes but carry over to edge-based or face-based field solvers.

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“…These calculations differ from other examples of unsteady flow calculations around trains found in the literature which have dealt with the transients associated with passing trains or tunnel entry. 14,15 Two different meshes were used in the flow computations. The first mesh was relatively coarse, consisting of 86,064 hexahedral elements and 92,545 nodes.…”

Section: Flow Computationsmentioning

confidence: 99%