Transient aerodynamic characteristics of vans during the accelerated overtaking process

Liu, Lining; Wang, Xingshen; Du, Guang-sheng; Liu, Zheng-gang; Li, Lei

doi:10.1007/s42241-018-0029-2

Cited by 7 publications

(6 citation statements)

References 12 publications

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“…Therefore, a suitable time step must be selected to ensure the quality of the updated grid. In similar studies, the time step of the simulation is usually between 0.0002s and 0.005s (Clarke & Filippone, 2007;Liu et al, 2018;Salati et al, 2018). The grid is updated at each time step, thus a smaller time step will greatly increase the computation time, and the grid will have a large displacement in a long time step, which will increase the difficulty of re-meshing or even cause the failure of re-meshing.…”

Section: Computational Setup For Aerodynamicsmentioning

confidence: 99%

“…These studies showed that the force and the yaw moment change remarkably as the overtaking vehicle moves from the rear of the overtaken vehicle to the front. Meanwhile, a computational method using a discontinuous interface grid and moving boundaries was developed to analyze the transient aerodynamic phenomenon (Clarke & Filippone, 2007;Liu et al, 2018;Okumura & Kuriyama, 2010;Uystepruyst & Krajnović, 2013). The results showed that the yaw moment experienced by an overtaken car is almost twice than that obtained by the quasi-static computation, and the increase in the relative velocity or acceleration of the two cars and the reduction in lateral space will increase the aerodynamic forces acting on the car.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, in traditional numerical simulation about the overtaking, the overtaken vehicles were assumed to be stationary with a relative velocity added to the overtaking vehicle, and the dynamic response and the change in the aerodynamic forces of the overtaken vehicle were not considered. However, the aerodynamic characteristics and movement of the overtaken vehicle are severely affected by overtaking maneuver especially in sedan-sedan overtaking (Liu et al, 2018). Conversely, the change in the aerodynamic forces and dynamic response of the overtaken vehicle will further influence the overtaking vehicle.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coupling analysis of transient aerodynamic and dynamic response of cars in overtaking under crosswinds

Zhang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The aerodynamic performance and dynamic response of two cars in overtaking maneuver under crosswind were investigated using a multi-car two-way coupling method. The coupling was achieved by exchanging aerodynamic forces obtained by computational fluid dynamic and vehicle dynamic responses acquired by multi-body dynamics in real time. The change rules of the aerodynamic force, moment, yaw angle, and lateral displacement of overtaking and overtaken cars were revealed on the basis of coupling computation. The coupling effect between aerodynamics and dynamics and the interplay between overtaking and overtaken cars were also illustrated. Moreover, the necessity of the two-way coupling was verified. Final results indicated that the posture of the body and the lateral space of the two vehicles are crucial to the stability of the vehicles during the overtaking maneuver, and the interaction between the aerodynamic forces and the dynamic response should be considered.

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Section: Computational Setup For Aerodynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coupling analysis of transient aerodynamic and dynamic response of cars in overtaking under crosswinds

Zhang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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“…The flow field on the road is unstable due to the presence of vehicles and natural wind [20], and the overtaking process has a considerable influence on the aerodynamic characteristics of a vehicle [21][22][23][24]. The numerical simulation results in Sun et al [25] showed that varying lateral distances affect the flow field around the vehicle differently when overtaking.…”

Section: Introductionmentioning

confidence: 99%

Influence of Small Vehicle on Transiting Test Method for Measuring Building Wind Pressure Coefficients

Liu

et al. 2021

Symmetry

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The transiting test method is a new approach for structural wind resistance research. However, traffic on the test road inevitably influences test results. In this study, the symmetrical CAARC standard tall building model was used to investigate the influence of a small vehicle near the test vehicle. A small vehicle was set up as an interference vehicle to drive around the test vehicle under different cases during the test. Results indicate that the mean wind pressure coefficient during the overtaking period is higher than that during the no overtaking period. The enlarged relative velocity and the small test vehicle velocity increase the overtaking interference and the data calculation time required to eliminate the overtaking influence. The overtaking influence only occurs if the test vehicle is overtaken by the small vehicle in the adjacent lane. The influence of the overtaking behavior of a small vehicle can be eliminated after the data calculation time exceeds 26 s. Moreover, the wake of small interference vehicle no longer influences the transiting test results after the spacing reaches 24 m.

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“…Wang Kun et al [9] studied the fluidization characteristics of turbulent fluidized bed through numerical simulation, and obtained the laws of pressure, particle velocity and particle size distribution in the bed. The moving grid method used for particle catching up draws lessons from the numerical method of vehicle catching up [10][11][12][13].…”

mentioning

confidence: 99%

Analysis of Flow Characteristics of Different Shape Particles Chasing

Zeng

Guo

2022

J. Phys.: Conf. Ser.

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in order to study the gas flow characteristics of particles with different shapes in the pursuit process, spherical, ellipsoidal and square particles are selected for numerical simulation by fluent. The results show that when the pursuit speed is the same, the streamline produced by square particles in the pursuit process is denser than that of spherical and ellipsoidal particles. Particle movement creates a certain vacuum on both sides and rear of the particle, causing the surrounding air flow to enter the areas on both sides of the particle, resulting in strong turbulence. After the rear particles catch up with the front particles, the changes of the surrounding flow field and streamline are similar to the inverse process before catching up, indicating that the particle motion has a certain regularity, and the square particles have the largest turbulent kinetic energy among the three particles.

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Transient aerodynamic characteristics of vans during the accelerated overtaking process

Cited by 7 publications

References 12 publications

Coupling analysis of transient aerodynamic and dynamic response of cars in overtaking under crosswinds

Coupling analysis of transient aerodynamic and dynamic response of cars in overtaking under crosswinds

Influence of Small Vehicle on Transiting Test Method for Measuring Building Wind Pressure Coefficients

Analysis of Flow Characteristics of Different Shape Particles Chasing

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