Static coupling between detached-eddy simulations and vehicle dynamic simulations of a generic road vehicle model with different rear configurations in unsteady crosswind

Favre, Tristan; Näfver, Jonas Jarlmark; Jerrelind, Jenny; Trigell, Annika Stensson; Efraimsson, Gunilla

doi:10.1504/ijvd.2016.082384

Cited by 5 publications

(3 citation statements)

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“…Even though later parametric studies also highlight the high sensitivity of the CoG [17,[31][32][33] and the importance of the CP position relative to the NSP [33], little is still known on the influence of suspension and other vehicle properties on crosswind sensitivity. The desired positioning of CoG can conflict with other vehicle attributes and changes to the suspension kinematics and compliance might be more realistic improvements for crosswind stability.…”

Section: Introductionmentioning

confidence: 99%

High speed driving stability of road vehicles under crosswinds: an aerodynamic and vehicle dynamic parametric sensitivity analysis

Brandt

Jacobson

Sebben

2021

Vehicle System Dynamics

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Crosswinds affect vehicle driving stability and their influence increase with driving speed. To improve high speed driving stability, interdisciplinary research using unsteady aerodynamics and vehicle dynamics is necessary. The current demands of faster development times require robust virtual methods for assessing stability performance in early design phases. This paper employs a numerical one-way coupling between the two disciplines and uses a variety of realistic crosswind gust profiles for the aerodynamic simulations to output representative forces and moments on three vehicle dynamic models of different fidelity levels, ranging from a one-track model to a full multi-body dynamic model of a sports utility vehicle. An investigation on required model fidelity was conducted along with a sensitivity study to find key aerodynamic and vehicle dynamic characteristics to minimise the yaw velocity and lateral acceleration response during crosswinds. Transient aerodynamic simulations were used to model crosswind gusts at high speeds. Analysis of the forces and moments showed that rapid changing gusts generate overshoots in the yaw moment, due to the phase delay of the flow between the front and rear of the vehicle. A methodology for modelling this phase delay is proposed. The response of the vehicle was captured equally well by the enhanced model (mid-level fidelity) and the full multibody dynamic model, while the simplest one-track model failed to emulate the correct vehicle response. The sensitivity study showed the importance of the positioning of the centre of gravity, the aerodynamic coefficient of yaw moment, wheel base, vehicle mass and yaw inertia. In addition, the axles' side force steer gradients and other suspension parameters revealed potential in improving crosswind stability.

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Section: Introductionmentioning

confidence: 99%

High speed driving stability of road vehicles under crosswinds: an aerodynamic and vehicle dynamic parametric sensitivity analysis

Brandt

Jacobson

Sebben

2021

Vehicle System Dynamics

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“…Huang et al (2017aHuang et al ( , 2017b investigate the necessity to conduct the two-way coupling with a 3-DOF vehicle model in crosswind. Favre et al (2016) use the 12-DOF vehicle dynamic model coupled with detached eddy simulation. However, the existing research on vehicle crosswind stability is based on computational fluid dynamics and vehicle dynamics consisting of a set of mathematical equations.…”

Section: Introductionmentioning

confidence: 99%

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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“…The trapeze-shaped deterministic crosswind profiles, which have cosine inlet and exit with a flat top, were used in the simulations. The trapeze-shaped crosswind profile is based on the experimental and numerical crosswind studies of Winkler et al, 20 Chadwick et al 42 and Favre et al 43 Additionally, the trapeze-shaped profile of crosswind gusts was classified as a realistic crosswind profile that counts for almost every third crosswind gust in the experimental crosswind study of Wojciak. 12 Four different crosswind reduced frequencies, k = 4.2, 2.1, 1.3 and 0.9, were used in the simulations, giving four different wavelengths of crosswinds, λ cw /L vehicle = 1.5, 3, 5, 7, respectively.…”

Section: Methodsmentioning

confidence: 99%

Two-way coupled aerodynamics and vehicle dynamics simulations of a heavy ground vehicle subjected to crosswind of various frequencies

Tunay

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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The present study investigates the dynamic characteristics of a heavy ground vehicle subjected to crosswind with various frequencies using two-way coupled simulations between aerodynamics and vehicle dynamics, including the driver’s steering inputs. Four different reduced frequencies of crosswind, which are equal to 4.2, 2.1, 1.3 and 0.9, are used. The results show that the absolute maximum magnitudes of the vehicle’s lateral dynamic and aerodynamic characteristics increase inversely proportional with the reduced frequencies of crosswinds without the driver’s steering input. However, when the driver’s steering input is included in the vehicle’s response to the crosswind disturbances, the vehicle’s lateral dynamic characteristics increase by the largest amount for reduced frequencies of 1.3 and 2.1. Furthermore, for a reduced frequency of 0.9, the driver’s steering inputs attenuate the unfavourable amplifications in the vehicle’s lateral dynamic characteristics. In the present study, the reasons for the increase in the vehicle’s lateral dynamic characteristics in the cases of reduced frequencies equal or greater than 1.3 with the driver’s steering input are explained. Additionally, the results show that the vehicle is not controlled within the 0.5 m lateral margins of the road when the steering starts with a time delay of 1.0 s for reduced frequencies equal to or lower than 2.1.

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Static coupling between detached-eddy simulations and vehicle dynamic simulations of a generic road vehicle model with different rear configurations in unsteady crosswind

Cited by 5 publications

References 0 publications

High speed driving stability of road vehicles under crosswinds: an aerodynamic and vehicle dynamic parametric sensitivity analysis

High speed driving stability of road vehicles under crosswinds: an aerodynamic and vehicle dynamic parametric sensitivity analysis

Coupled analysis of vehicle stability in crosswind on low adhesion road

Two-way coupled aerodynamics and vehicle dynamics simulations of a heavy ground vehicle subjected to crosswind of various frequencies

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