Transient aerodynamic characteristics of vans overtaking in crosswinds

Liu, Lining; Sun, Yumei; Chi, Xuefeng; Du, Guang-sheng; Wang, Meng

doi:10.1016/j.jweia.2017.07.014

Cited by 27 publications

(11 citation statements)

References 14 publications

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“…Uystepruyst and Krajnović’s 11 study with two Ahmed models under several different relative velocities and transverse spacings analyzed the aerodynamic influence on the overtaken vehicle. Liu et al 12 performed simulations on two full-scale identical vans during the overtaking process under different crosswind conditions. The results showed that the crosswind significantly affected the aerodynamic force on the overtaken van (on the lee side).…”

Section: Introductionmentioning

confidence: 99%

Coupled analysis of the unsteady aerodynamics and multi-body dynamics of a small car overtaking a coach

Liu

Huang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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The severe additional aerodynamic loads that are generated on a small car when overtaking a coach have an adverse effect on the car handling stability and its safety. In this article, a two-way coupling of the unsteady aerodynamics and multi-body dynamics is performed in order to study the mutual interactions of a car in an overtaking maneuver with a coach. The unsteady aerodynamic interactions are obtained by using SST (Menter) K-Omega Detached Eddy Simulation and overset mesh technology. The aerodynamics couple the multi-body dynamics, taking into account the effects of the transverse spacing and the cross winds. To validate the necessity of the two-way coupling method, a one-way coupling of the aerodynamics to the vehicle motion is also conducted. Finally, by comparing the aerodynamic loads and the dynamic response of the overtaking car in different overtaking maneuvers between one- and two-way coupling, the results show that it should be considered with two-way coupling analyses of the car while overtaking a coach, particularly under the severe conditions of a lower transverse spacing or the crosswinds.

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Section: Introductionmentioning

confidence: 99%

Coupled analysis of the unsteady aerodynamics and multi-body dynamics of a small car overtaking a coach

Liu

Huang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The flow around road vehicles under crosswind conditions has also been investigated using these methods. 26,27 Although many studies have simplified the vehicle for simulations, the shape of the vehicle is still very complex. Therefore, the flow around the simplified vehicle is highly unsteady and three-dimensional, and the flow also exhibits separation and re-attachment.…”

Section: Methodsmentioning

confidence: 99%

Investigation of vehicle stability under crosswind conditions based on coupling methods

Huang

Wan

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this study, vehicle stability under crosswind conditions is investigated. A two-way coupling method is established based on computational fluid dynamics and vehicle multi-body dynamics. Large eddy simulation is employed in the computational fluid dynamics model to compute the transient aerodynamic load, and the accuracy of the large eddy simulation is validated with a wind tunnel experiment. The arbitrary Lagrange–Euler technique is used in the computational fluid dynamics simulation to realise vehicle motion, and a real-time data transmission method is employed to ensure effective exchange of data between the computational fluid dynamics and multi-body dynamics models. The robustness of the two-way coupling model is verified by changing the position of the vehicle centroid. The results of the two-way and one-way coupling simulations demonstrate that crosswinds significantly affect vehicle stability. There is a clear difference between the results obtained with the two methods, particularly after the disappearance of the crosswind. The main reason for the difference is that the interaction between the transient airflow and the vehicle movement is considered in the two-way coupling method. Therefore, investigations of vehicle stability under crosswind conditions should consider the coupling of transient aerodynamic force and vehicle movement.

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“…However, the overtaking process of vehicles also plays an essential contribution to the instability of the vehicle. Some scholars investigate overtaking process either in simulation on by experimental testing [8,[24][25][26]. Some other researchers also examine the combination between overtaking processes along with the presence of crosswind [27,28].…”

Section: Introductionmentioning

confidence: 99%

“…Some scholars investigate overtaking process either in simulation on by experimental testing [8,[24][25][26]. Some other researchers also examine the combination between overtaking processes along with the presence of crosswind [27,28]. The investigation includes the effects of aerodynamic force coefficients and the visualization of the flow field around the vehicle.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics of Overtaking Bus under Crosswind: CFD Investigation

Yudianto

Sofyan

Gunadi

et al. 2022

CFDL

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The presence of other vehicles, travelling together on the road, highly contributes to the condition on the realistic air flow direction. The position alteration of other vehicles generates different airflow direction which is unpredictable experienced by the vehicle under investigation. It considerably affects the stability of a vehicle having large size of the body. The purpose of the study was to investigate the aerodynamic response of a detailed bus model in overtaking process with the interference of crosswind. Fluidic simulation was performed to investigate the air flow behavior imposed on the bus by means of Computational Fluid Dynamics (CFD) analysis. A scaled bus model was used in the simulation with the different positions representing the buses during the overtaking process. The coefficient X/L was introduced to realize the vehicle position during the overtaking process. The results discussed the alteration of drag force coefficient, lift force coefficient, side force coefficient, during the position on overtaking process. The resulting turbulence kinetic energy around the bus was also discussed by comparing the case without crosswind and when the yaw angle was 30°. The most prominent aerodynamic forces alteration occurs when the overtaking process was at X/L=1. Further explanation about the pressure coefficient at the surface of the bus and the area around the vehicle was investigated at this position. The accuracy of numerical results calculation was verified by comparing the result of simulation and experimental testing of Cd and Cl with the percentage of deviation 0.37% and 2.90% respectively.

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Transient aerodynamic characteristics of vans overtaking in crosswinds

Cited by 27 publications

References 14 publications

Coupled analysis of the unsteady aerodynamics and multi-body dynamics of a small car overtaking a coach

Coupled analysis of the unsteady aerodynamics and multi-body dynamics of a small car overtaking a coach

Investigation of vehicle stability under crosswind conditions based on coupling methods

Aerodynamic Characteristics of Overtaking Bus under Crosswind: CFD Investigation

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