Coupled 6DoF motion and Aerodynamics Simulation of Road Vehicles in Crosswind gusts

Ishioka, Hirotaka; Onishi, K.; Nakasato, Kosuke; Nakashima, Takuji; Tsubokura, Makoto

doi:10.2514/6.2015-3308

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…Top and bottom boundaries of the domain are treated as free-slip wall. The treatment for vehicle wall boundary condition adopts the approach used by Ishioka et al (2015), who performed a similar simulation with LES.…”

Section: Aerodynamicsmentioning

confidence: 99%

“…The impact of vehicle motion on aerodynamic characteristics has been studied many times by a team from Japan (Okada et al, 2012;Tsubokura et al, 2012;Nakashima et al, 2013a;Kono et al, 2016). The degrees of the freedom (DOF) coupled with aerodynamics and vehicle dynamics are gradually increased from 3-DOF to 6-DOF (Nakashima et al, 2010(Nakashima et al, , 2013bIshioka et al, 2015). Carbonne et al (2016) study the vehicle stability by two-way coupling, and compare the sensitivity of different vehicle styles exposed to a crosswind and also investigate the driver model in crosswind with the two-way coupling approach (Winkler et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Coupled analysis of vehicle stability in crosswind on low adhesion road

Huang

et al. 2018

HFF

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Purpose The purpose of this paper is to develop a two-way coupling approach for investigating the aerodynamic stability of vehicles under the combined effect of crosswind and road adhesion. Design/methodology/approach The author develops a new two-way coupling approach, which couples large eddy simulation with multi-body dynamics (MBD), to investigate the crosswind stability on three different adhesion roads: ideal road, dry road and wet road. The comparison of the results obtained using the traditional one-way coupling approach and the new two-way coupling approach is also done to assess the necessity to use the proposed coupling technique on low adhesion roads, and the combined effect of crosswind and road adhesion on vehicle stability is analyzed. Findings The results suggest that the lower the road adhesion is, the larger deviation a vehicle generates, the more necessary to conduct the two-way coupling simulation. The combined effect of the crosswind and road adhesion can decrease a vehicle’s lateral motion on a high adhesion road after the disappearing of the crosswind. But on a low adhesion road, the vehicle tends to be unstable for its large head wind angle. The vehicle stability in crosswind on a low adhesion road needs more attention, and the investigation should consider the coupling of aerodynamics and vehicle dynamics and the combined effect of crosswind and road adhesion. Originality/value Developing a new two-way coupling approach which can capture the complex vehicle structures and the road adhesion with MBD model and the completed fluid filed structure with CFD model. The present study might be the first study considering the coupling of crosswind and low adhesion road. The proposed two-way coupling approach will be useful for researchers who study vehicle crosswind stability.

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Section: Aerodynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupled analysis of vehicle stability in crosswind on low adhesion road

Huang

et al. 2018

HFF

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“…It was shown by Winkler and colleagues 20,21 that the two-way coupling was needed for the large yaw motion of the vehicle because the one-way coupling over-predicted the aerodynamic loads and in turn the vehicle motion. In Ishioka et al, 22 a two-way coupled simulation method between the 6-DoF motion of the vehicle body and the aerodynamics was developed, and a comparison of the results of a one-way analysis revealed that the vehicle behavior was different because the flow structure around the vehicle changed depending on the vehicle motions considered in the simulation. The small change in the vehicle posture also generated unsteady aerodynamic forces and moments, which indicated the utility of the two-way coupled analysis.…”

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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“…In their conclusion, certain differences have been identified in the vehicle path and the yaw angle between the quasi-steady and the fully coupled analyses. After that, Ishioka et al (2015) have revealed differences between the results of one-way and two-way coupling approaches. Winkler et al (2016) have conducted a more detailed study and they have stated that one-way coupling approach overestimate the aerodynamic loads and accordingly lateral motion of the vehicle, i.e.…”

Section: Introductionmentioning

confidence: 99%