Effect of moving ground on the aerodynamics of a generic automotive model: The DrivAer-Estate

Wang, Shibo; Avadiar, Terence; Thompson, Mark C.; Burton, David

doi:10.1016/j.jweia.2019.104000

Cited by 31 publications

(15 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, complex turbulence was identified around the rear part of vehicle, because of the interactions of separated flows from all directions around the vehicle. This was consistent with existing research on the rear streamline of the hatchback passenger car [32] which, to a certain extent, suggested the wind tunnel experiment could simulate the actual flow field of the vehicle in a certain precision range based on the careful experimental design.…”

Section: Wind Tunnel Flow Pattern Experimentssupporting

confidence: 90%

Modeling Emission Flow Pattern of a Single Cruising Vehicle on Urban Streets with CFD Simulation and Wind Tunnel Validation

Shi

Sun

Zhang

et al. 2020

IJERPH

View full text Add to dashboard Cite

Transportation has become one of the primary sources of urban atmospheric pollutants and it causes severe diseases among city residents. This study focuses on assessing the pollutant dispersion pattern using computational fluid dynamics (CFD) numerical simulation, with the effect and results validated by the results from wind tunnel experiments. First, the wind tunnel experiment was carefully designed to preliminarily assess the flow pattern of vehicle emissions. Next, the spatiotemporal distribution of pollutant concentrations around the motor vehicle was modeled using a CFD numerical simulation. The pollutant concentration contours indicated that the diffusion process of carbon monoxide mainly occurred in the range of 0−2 m above the ground. Meanwhile, to verify the correctness of the CFD simulation, pressure distributions of seven selected points that were perpendicular along the midline of the vehicle surface were obtained from both the wind tunnel experiment and the CFD numerical simulation. The Pearson correlation coefficient between the numerical simulation and the wind tunnel measurement was 0.98, indicating a strong positive correlation. Therefore, the distribution trend of all pressure coefficients in the numerical simulation was considered to be consistent with those from the measurements. The findings of this study could shed light on the concentration distribution of platoon-based vehicles and the future application of CFD simulations to estimate the concentration of pollutants along urban street canyons.

show abstract

Section: Wind Tunnel Flow Pattern Experimentssupporting

confidence: 90%

Modeling Emission Flow Pattern of a Single Cruising Vehicle on Urban Streets with CFD Simulation and Wind Tunnel Validation

Shi

Sun

Zhang

et al. 2020

IJERPH

View full text Add to dashboard Cite

show abstract

“…The data used in nest section were averaged from non-dimensional time tU m /S tr 1/2 of 72-287, which is about 14 times the time required for the airflow to pass through the whole train. The sampling time in this study was similar to those used in previous studies (Wang et al, 2017;Wang et al, 2018b;Wang et al, 2019c), and was much longer than those used in (Chen et al, 2018;Dong et al, 2019;Guo et al, 2018;Guo et al, 2019;Li et al, 2019;Wang et al, 2019b).…”

Section: Data Processingmentioning

confidence: 54%

“…The aerodynamic shape of the train is complex, and the flow field around the train is strongly turbulent and unsteady; therefore, it is important to determine an appropriate turbulence model for obtaining reliable calculation results. Previous studies (Ge et al, 2019;Halila et al, 2019;Issakhov et al, 2019;Li et al, 2018;Menter, 1994;Menter, 1996;Menter et al, 2003;Mou et al, 2017;, 2018a; Niu et al, 2019b;Wang et al 2019aWang et al , 2019b have demonstrated the robustness of the shear-stress transport (SST) κ-ω turbulence model as a means of simulating the strong separation flow; consequently, this model has been widely applied in train aerodynamics (Chen et al, 2018;Chen et al, 2019;Liu et al, 2018;;Niu et al, 2018d;Tschepe et al, 2019;Wang et al, 2018cWang et al, 2019cZhang et al, 2018c). As a hybrid method of RANS/LES, the DES method was proposed in 1997, and the RANS and LES were used to deal with the attached flow and separated flow, respectively (Shur et al, 2008).…”

Section: Methodsmentioning

confidence: 99%

Comparison of different configurations of aerodynamic braking plate on the flow around a high-speed train

Niu

Wang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

End of vehicle streamlined head was selected as the installation location, and aerodynamic behavior of trains with and without braking plates was compared to analyze the formation of the braking force and the evolution of the flow field. An IDDES method based on the SST κ-ω turbulence model was used to investigate the unsteady flow, and the numerical algorithm was validated. Results show that the train aerodynamic drag was significantly increased by opening the braking plates, especially when several braking plates were arranged separately in series on each train car. Furthermore, the effect of the plate installed on the tail car was superior to that of the braking plate on the head car, when only a single braking plate was used. It was also found that both the maximum value of the slipstream and negative pressure close to the braking plate depend on the position and size of the braking plate. The flow field around the lower part of the train was only slightly affected by opening the braking plates, and pairs of vortices over the train appeared when the braking plates were opened, significantly affected both size and position of vortices in the train wake.

show abstract

“…Mesh generation, solving, and results postprocessing are all completed in CFD software STAR-CCM+ 11.06 (Siemens PLM Software Company, Germany). e polyhedral mesh technology and prim layer mesh technology available in STAR-CCM+ 11.06 are used to generate the mesh model of two generator units and grid refinement for the rotating region and rotating fan tip region which are set by the grid refinement method with smaller mesh size [20,21]. After mesh generation, the grid number for the computational domain of the generator unit is about 20 million.…”

Section: Cfd Modeling Of Generator Unitmentioning

confidence: 99%

Numerical Simulation on Flow Field and Design Optimization of a Generator Unit Based on Computational Fluid Dynamics Analysis

Tan

Yuan

et al. 2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Achieving an optimal cooling of the generator unit is indispensable for high working performance. In this work, computational fluid dynamics analysis on the flow field of the conventional type and silent type of the S688CCS series generator unit is conducted, and design optimization of the generator unit with poor cooling is studied based on flow field analysis results. Flow field simulation results indicate that the total cooling air quantity of the silent type generator unit is lower than that of the conventional type generator unit, and the cooling air quantity of the radiator is also lower than that of the conventional type generator unit, which is not conductive for the cooling of the silent type generator unit. The flow field optimization is achieved by adopting the single variable control method to improve the structure of the fan cover, silent components for silence, adjacent structure, and air inlet grille. The corresponding structure optimization scheme is put forward. After optimization, the air quantity for the cooling radiator of the silent type generator unit is 44.33% higher than that of its original structure, and the total cooling air quantity is higher than that of the conventional type generator unit. The research results in this work can provide a theoretical basis for the design of the cooling air flow path of generator units for achieving an optimal cooling performance.

show abstract

Effect of moving ground on the aerodynamics of a generic automotive model: The DrivAer-Estate

Cited by 31 publications

References 16 publications

Modeling Emission Flow Pattern of a Single Cruising Vehicle on Urban Streets with CFD Simulation and Wind Tunnel Validation

Modeling Emission Flow Pattern of a Single Cruising Vehicle on Urban Streets with CFD Simulation and Wind Tunnel Validation

Comparison of different configurations of aerodynamic braking plate on the flow around a high-speed train

Numerical Simulation on Flow Field and Design Optimization of a Generator Unit Based on Computational Fluid Dynamics Analysis

Contact Info

Product

Resources

About