Open Access
ARTICLE
Effect of RANS Model on the Aerodynamic Characteristics of a Train in Crosswinds Using DDES
Tian Li1, *, Zhiyuan Dai1, Weihua Zhang1
1 State-Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China.
* Corresponding Author: Tian Li. Email: .
Computer Modeling in Engineering & Sciences 2020, 122(2), 555-570. https://doi.org/10.32604/cmes.2020.08101
Received 27 July 2019; Accepted 21 November 2019; Issue published 01 February 2020
Abstract
Detached eddy simulation has been widely applied to simulate the flow around
trains in recent years. The Reynolds-averaged Navier-Stokes (RANS) model for delayed
detached eddy simulation (DDES) is an essential user input. The effect of the RANS
model for DDES on the aerodynamic characteristics of a train in crosswinds is
investigated in this study. Three different DDES models are used, based on the Spalart-Allmaras model (SA), the realizable
k-ε model (RKE), and the shear stress transport k-ω
model (SST). Results show that all DDES models can give relatively accurate predictions
of pressure coefficient on almost all surfaces. There are only some specific differences in
the small vortices, while similar flow patterns around trains could be predicted. The SST
based DDES model (SSTDDES) gives the most accurate numerical results among the
three models for the surface pressure. The variations in pressure on the leeward face play
a key role in the variation of the side force.
Keywords
Cite This Article
Li, T., Dai, Z., Zhang, W. (2020). Effect of RANS Model on the Aerodynamic Characteristics of a Train in Crosswinds Using DDES.
CMES-Computer Modeling in Engineering & Sciences, 122(2), 555–570. https://doi.org/10.32604/cmes.2020.08101
Citations