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The Impact of Bogie Sections on the Wake Dynamics of a High-Speed Train

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Abstract

The impact of bogie sections on the wake dynamics of a high-speed train (HST) is numerically explored using the improved delayed detached eddy simulation (IDDES). Time-averaged and instantaneous wake flow topology are compared for two underbody configurations: the complex train model (CTM) with bogie sections and the simplified train (STM) with a flat underbody. For both underbody configurations, a pair of counter-rotating half-loop vortices dominates the unsteady wake. Each member of the vortex pair is shed alternately in the wake of the CTM, which is attributed to vortex shedding from the bogie sections. While for the STM, the members of this vortex pair couple and appear simultaneously. The dynamic characteristics of the wake are clarified by using proper orthogonal decomposition (POD) analysis for the IDDES results. The first four POD modes, corresponding to the dominant vortex structures, are analysed in detail, which confirms the significant impact of bogie sections on the wake dynamics of a HST.

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Abbreviations

St w :

Strouhal number

f :

The frequency

D :

The hydraulic diameter

U * :

The streamwise velocity

W :

The train width

U ∞ :

The oncoming flow velocity

u * :

The friction velocity

n :

The distance between the first node and the train surface in the wall normal direction

Δl :

The cell width in the streamwise direction

Δs :

The cell width in the spanwise direction

h wn :

The grid step in the wall-normal direction

C w :

An empirical constant

h max :

The largest local grid spacing

h x :

Local streamwise cell size

h y :

Local wall-normal cell size

h z :

Local lateral cell size

t * :

t* = H/U∞

C D :

The force coefficient

F x :

The drag force

ρ :

The density of the air

A x :

The projected area in the x direction

C P :

The pressure coefficient

P :

The time-averaged surface pressure

P ∞ :

The static pressure

u :

The velocity in the X direction

v :

The velocity in the Y direction

w :

The velocity in the Z direction

U mean :

Time-averaged x-direction velocity

V mean :

Time-averaged y-direction velocity

U RMS :

x-direction velocity fluctuation

V RMS :

y-direction velocity fluctuation VRMS

ω x * :

x-direction vorticity

ω z * :

z-direction vorticity

a j :

The temporal coefficients of the POD modes

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grand No. 51875411), Shanghai Key Laboratory of Aerodynamics and Thermal Environment Simulation for Ground Vehicles (Grand No. 18DZ2273300) and Shanghai Automotive Wind Tunnel Technical Service Platform (Grand No. 19DZ2290400). The computing facility and aero-acoustic wind tunnel of Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems is gratefully acknowledged.

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Authors and Affiliations

  1. Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Shanghai, 201804, China

    Zhiwei Zhou, Chao Xia, Xizhuang Shan & Zhigang Yang

  2. Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai, 201804, China

    Zhiwei Zhou, Chao Xia, Xizhuang Shan & Zhigang Yang

  3. Beijing Aeronautical Science & Technology Research Institute, Beijing, 102211, China

    Zhigang Yang

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  1. Zhiwei Zhou
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Correspondence to Chao Xia.

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Zhou, Z., Xia, C., Shan, X. et al. The Impact of Bogie Sections on the Wake Dynamics of a High-Speed Train. Flow Turbulence Combust 104, 89–113 (2020). https://doi.org/10.1007/s10494-019-00052-w

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