Flow topology and unsteady features of the wake of a generic high-speed train

Bell, James; Burton, David; Thompson, Mark C.; Herbst, Astrid H.; Sheridan, John

doi:10.1016/j.jfluidstructs.2015.11.009

Cited by 59 publications

(38 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This periodic wake structure coincides with fluctuation pressure on the surface that show significant effects on the drag and stability of HST [3] . Different research approaches have been utilized to investigate the wake of a HST.…”

Section: Introductionsupporting

confidence: 59%

“…Figure 4 (a) and (b) shows the time-averaged vorticity contours and velocity vectors at the plane x/W=1 in the wake of simplified model and complex model, respectively. It can be noted that a dominating pair of counter-rotating streamwise vortices, well-established in literature [1][2][3][5][6][7]13,14], exists in both configurations. The vortex pair moves downwards and outwards in the wake.…”

Section: Numerical Validationmentioning

confidence: 54%

See 1 more Smart Citation

Numerical Study on the Effect of Underbody Configurations on the Wake of a High-speed Train

Zhou¹,

Xia²,

Zheng³

et al. 2017

dtetr

View full text Add to dashboard Cite

The effect of underbody configurations on the wake of a high-speed train (HST) is numerically investigated with improved delayed detached eddy simulation (IDDES). There are two train models which are different in underbody configuration, i.e., complex train with bogie sections and simplified train with flat underbody. Both time-averaged and instantaneous wake structures are compared for the two underbody configurations. For both underbody configurations, a pair of counterrotating streamwise vortices exists in the wake. The vortex pair of the complex train oscillates more violently along the spanwise direction, leading to a wider wake than that of the simplified train. In addition, each of the vortex pair appears alternatively in the wake of the complex train, while the wake of simplified train presents simultaneous coupled vortex pair. The difference in the wake of the two underbody configurations can be attributed to the effect of bogie sections.

show abstract

Section: Introductionsupporting

confidence: 59%

Section: Numerical Validationmentioning

confidence: 54%

Numerical Study on the Effect of Underbody Configurations on the Wake of a High-speed Train

Zhou¹,

Xia²,

Zheng³

et al. 2017

dtetr

View full text Add to dashboard Cite

show abstract

“…In term of the time-averaged flow, a pair of trailing vortices has been identified in the wake of a slender high-speed train (HST), they move initially towards the ground and then away from each other due to mutual induction and interaction with the ground [1][2][3][4][5][6] . Recently researchers also found that the near wake of a HST presents periodic unsteadiness and oscillation (vortex shedding and a pair of counter-rotating trailing vortices), which may cause high slipstream velocity [2,3,5,7] .…”

Section: Introductionmentioning

confidence: 99%

“…Recently researchers also found that the near wake of a HST presents periodic unsteadiness and oscillation (vortex shedding and a pair of counter-rotating trailing vortices), which may cause high slipstream velocity [2,3,5,7] . Slipstream is the air flow induced by a train's movement, which has attracted numerous investigations in the last decade, since it has direct impacts on the passengers waiting on platforms, trackside workers, loadings on the nearby structures, and also the aerodynamic stability of trains passing by each other.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study on the Unsteady Wake of a High-speed Train

Xia¹,

Bao²,

Shan³

et al. 2017

dtetr

View full text Add to dashboard Cite

The unsteady wake of a 1/50 scale high-speed train (HST) is investigated experimentally in a wind tunnel. Based on hot-wire anemometry and Particle Image Velocimetry (PIV) measurement, it can be observed that the wake of a slender HST is dominated by a pair of counter-rotating streamwise trailing vortices and periodical anti-symmetric vortex shedding; Each of the streamwise trailing vortices presents increase/decrease alternately in size and vorticity, along with spanwise and vertical oscillation, which could be attributed to vortex shedding shed from the sides of the tail train. In addition, the interaction between trailing vortices and the ground induces second vortices and intensifies the unsteady features in the wake.

show abstract