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Unsteady aerodynamic loads on high speed trains passing by each other

  • Thermal Engineering · Fluid Engineering · Energy and Power Engineering
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Abstract

In order to study unsteady aerodynamic loads on high speed trains passing by each other 350km/h, three-dimensional flow fields around trains during the crossing event are numerically simulated using three-dimensional Euler equations. Roe’s FDS with MUSCL interpolation is employed to simulate wave phenomena. An efficient moving grid system based on domain decomposition techniques is developed to analyze the unsteady flow field induced by the restricted motion of a train on a rail. Numerical simulations of the strain passing by on the double-track are carried out to study the effect of the train nose-shape, length and the existence of a tunnel on the crossing event. Unsteady aerodynamic loads-a side force and a drag force-acting on the train during the crossing are numerically predicted and analyzed. The side force mainly depends on the nose-shape, and the drag force depends on tunnel existence. Also. a push-pull (i.e. impluse force) force successively acts on each car and acts in different directions between the neighborhood cars. The maximum change of the impulsive force reaches about 3 tons. These aerodynamic force data are absolutely necessary to evaluate the stability of high speed multi-car trains. The results also indicate the effectiveness of the present numerical method for simulating the unsteady flow fields induced by bodies in relative motion.

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Abbreviations

A, B, C :

Inviscid flux Jacobian

C s :

Side force coefficient

C d :

Drag coefficient

C l :

Lift coeffient

D :

Tunnel diameter or diagonal matrix

E :

Total energy

E, F, G :

Inviscid flux vector

FDS :

Flux Difference Splitting

FSA :

Fortified Solution Algorithm

GLS :

Galerkin Least Squares

I :

Identity matrix

J :

Jacobian of transformation

MUSCL :

Monotone Upstream-Centered Scheme for Conservation Law

P :

Pressure

Q :

Vector of conservative variables

u, v, w :

Velocity vector

x, y, z :

Cartesian coordinate

γ:

Specific heat

ϱ:

Density

ξ, η, ζ:

Generalized coordinate

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Seol National University, Korea

    Dong-Ho Lee (Professor)

  2. Department of Aerospace Engineering, Institute of Advonced Machinery Design, Soeul National University, San 56-1, Shinlim-dong, Kwanak-Ku, 151-742, Seuol, Korea

    Jaeho Hwang (Research Assistant)

Authors
  1. Jaeho Hwang
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  2. Dong-Ho Lee
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Correspondence to Jaeho Hwang.

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Hwang, J., Lee, DH. Unsteady aerodynamic loads on high speed trains passing by each other. KSME International Journal 14, 867–878 (2000). https://doi.org/10.1007/BF03184475

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  • DOI: https://doi.org/10.1007/BF03184475

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