The Grid Strategy of High Reliable Numerical Simulations for Aerodynamic Performance of High-Speed Trains

2014 ◽  
Author(s):  
C.W. Jiang ◽  
Z.X. Gao ◽  
J.S. Yang ◽  
C.H. Lee
Keyword(s):  
Numerical Simulations ◽  
High Speed ◽  
Aerodynamic Performance ◽  
High Speed Trains

Application of OpenFOAM in Numerical Simulations of High-Speed Trains Aerodynamics

2021 ◽  
Author(s):  
Panpan Lu ◽  
Bo Yin ◽  
Guowei Yang ◽  
Zhanling Ji
Keyword(s):  
Turbulent Flow ◽  
Mesh Generation ◽  
High Speed ◽  
Aerodynamic Performance ◽  
Critical Conditions ◽  
High Speed Train ◽  
Operation Conditions ◽  
Mesh Method ◽  
High Speed Trains ◽  
Inverse Distance

Abstract The present study uses openFOAM package to simulate and investigate the aerodynamic performance and characteristics of high-speed trains (velocity beyond 250 km/h) under typical and critical conditions, which include flow passing a high-speed train, and two trains meeting towards each other at the same velocity in the open air. In terms of different operation conditions, separate openFOAM solvers are adopted. For flow passing a high-speed train at a constant velocity, a steady solver for incompressible, viscous and turbulent flow is employed on a fixed mesh and the results are compared with commercial software Star CCM+. For trains meeting towards each other, overset mesh method is used in which inverse distance interpolation is taken to couple background and inner overset mesh. The built-in mesh generation tool SnappyHexMesh is utilized to generate background and inner overset mesh. In all simulations, k-ω SST two equations RANS model is used to simulate the turbulent flow.

Numerical study on the aerodynamic performance and safe running of high-speed trains in sandstorms

2011 ◽  
Vol 12 (12) ◽  
pp. 971-978 ◽  
Author(s):  
Hong-bing Xiong ◽  
Wen-guang Yu ◽  
Da-wei Chen ◽  
Xue-ming Shao
Keyword(s):  
High Speed ◽  
Numerical Study ◽  
Aerodynamic Performance ◽  
High Speed Trains

Numerical simulation of the effects of obstacle deflectors on the aerodynamic performance of stationary high-speed trains at two yaw angles

2017 ◽  
Vol 232 (3) ◽  
pp. 913-927 ◽  
Author(s):  
Ji-qiang Niu ◽  
Dan Zhou ◽  
Xi-feng Liang
Keyword(s):  
High Speed ◽  
Simulation Method ◽  
Aerodynamic Performance ◽  
Wake Flow ◽  
Detached Eddy Simulation ◽  
Aerodynamic Forces ◽  
Eddy Simulation ◽  
Delayed Detached Eddy Simulation ◽  
High Speed Trains ◽  
Yaw Angle

In this study, based on the shear-stress transport κ–ω turbulent model, the improved delayed detached eddy simulation method has been used to simulate the unsteady aerodynamic performance of trains with different obstacle deflectors at two yaw angles (0° and 15°). The numerical algorithm is used and some of the numerical results are verified through wind tunnel tests. By comparing and analysing the obtained results, the effects of the obstacle deflectors on the force of the trains as well as the pressure and flow structure around the trains are elucidated. The results show that the obstacle deflectors primarily affect the flow field at the bottom of the head car as well as the wake flow, and that the internal oblique-type obstacle deflector (IOOD) markedly improves the aerodynamic performance of the trains, by decreasing most of the aerodynamic forces of the train cars and minimising their fluctuations. Further, a nonzero yaw angle weakens or even changes the effect of the IOOD on the aerodynamic forces of the train cars. However, the effect of the IOOD is more on the tail car.

scholarly journals High-speed trains: in microchannels?

2016 ◽  
Vol 792 ◽  
pp. 1-4 ◽  
Author(s):  
Jeffrey F. Morris
Keyword(s):  
Numerical Simulations ◽  
High Speed ◽  
Particle Concentration ◽  
Hydrodynamic Interactions ◽  
Suspension Flow ◽  
Rectangular Microchannel ◽  
Inertial Focusing ◽  
High Speed Trains ◽  
Particle Ordering

Kahkeshani et al. (J. Fluid Mech., vol. 786, 2016, R3) have studied particle ordering in suspension flow in a rectangular microchannel. Experiments and numerical simulations reveal that inertial focusing and hydrodynamic interactions result in long-lived ‘trains’ of regularly spaced particles. The preferred spacing is frustrated at sufficient particle concentration, an important feature for applications.

Sign in / Sign up

Export Citation Format

Share Document