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An IDDES study of the near-wake flow topology of a simplified heavy vehicle

Transportation Safety and Environment 2022年第2期4卷 105-122页

作者： Jie Zhang Zhanhao Guo Shuai Han Siniša Krajnovi′c John Sheridan Guangjun Gao Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangsha 410075China Joint International Research Laboratory of Key Technology for Rail Traffic Safety Central South UniversityChangsha 410075China National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle Central South UniversityChangsha 410075China Department of Mechanics and Maritime Sciences Chalmers University of TechnologyGothenburg 41296Sweden Department of Mechanical and Aerospace Engineering Monash UniversityClaytonVictoria 3800Australia.

The complex wake flow of a GTS(ground transportation system)model contributes to large percentage of the aerodynamic drag ***,predicting accurate wake flow will help carry out the drag reduction *** this paper,the near-wake flow topology of the GTS was studied at Re=2.7×104 to assess the capability of a hybrid RANS/LES(Reynolds-averaged Navier–Stokes/large eddy simulation)approach,known as IDDES(improved delayed detached eddy simulation).The current study also aims to understand the effects of different computational parameters,*** spatial resolution,time step,residual level,discretization scheme and turbulence model,on this asymmetrical wake flow configuration.A comparison of IDDES with previous water channel tests,wellresolved LES,partially averaged Navier–Stokes and URANS(unsteady RANS)was included to better understand the benefits of this hybrid RANS/LES *** results show that on the medium and fine grids,the IDDES produces an asymmetrical flow topology(known as flow state I)in the near-wake of the vertical midplane,as reported in previous *** recommended parameters for the time step(1×10^(–4 )s)and residual level(1×10^(–4))provide sufficient accuracy of wake predictions to show good agreement with *** the convective term of the momentum equation in IDDES,the bounded central difference discretization scheme is proposed to be adopted for ***,URANS cannot accurately capture this asymmetrical flow *** proves to be capable of predicting thewake flowfield of this simplified heavy vehicle with high *** obtained conclusions can provide references for the aerodynamic drag reduction of the GTS.

关键词： Heavy vehicle asymmetrical wakes IDDES Computational parameter

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