Detached-Eddy Simulations for Steady and Unsteady Crosswind Aerodynamics of Ground Vehicles.

Favre, Tristan; Efraimsson, Gunilla; Elofsson, Per

doi:10.2514/6.2011-3066

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…This is to confirm the flow simulation that will occur inside the enclosure boundary. The fundamental parameters for the validation case on the distances of the length between the inlet and the vehicle, the outlet, and the vehicle are based on the most recent studies [13]- [15]. Before beginning the meshing process, the enclosure must be effective enough to ensure that the computational domain is the optimal size.…”

Section: Methodsmentioning

confidence: 99%

Analysis of the Aerodynamic Characteristics of Small-Sized Car Vehicles under the Influence of Steady Crosswind

Lim

Ishak

Arafat

et al. 2023

ijaste

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The crosswind is one of the factors that can lead to a car accident. Crosswind is defined as a side force that causes a vehicle to become unstable and deviate from its desired path. This article focuses on evaluating the flow behaviour and aerodynamic loads that affect vehicle stability when driving in a steady crosswind. In this study, a numerical approach is used with the ANSYS Fluent software as a platform to run the simulation. In this research, the crosswind flow angle (Ψ) is varied from 0° to 90°. The incompressible flow surrounding the vehicle is solved using the Reynolds-Averaged Navier-Stokes (RANS) equations in conjunctions with the k-ε turbulence model. The Reynolds number is utilized depending on the velocity of the vehicle which are 2.8×106 for high Reynolds number and 7.2×105 for low Reynolds number respectively. According to the findings, the crosswind has a significant quantitative and qualitative impact on aerodynamics. In terms of aerodynamic load, the side coefficient (Cs) increases as the crosswind yaw angle increases. When the crosswind yaw angle reaches 60°, there is a significant drop, but it remains almost constant when the crosswind yaw angle reaches 90°. In terms of flow structure, as the crosswind yaw angle increases, the vortex formation on the leeward region expands, increasing the vehicle stability imbalance. Finally, there is no significant difference in the quantitative aerodynamic characteristics of high and low Reynolds numbers.

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Section: Methodsmentioning

confidence: 99%

Analysis of the Aerodynamic Characteristics of Small-Sized Car Vehicles under the Influence of Steady Crosswind

Lim

Ishak

Arafat

et al. 2023

ijaste

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show abstract

“…A pressure center is first proposed and used as aerodynamic reference point, and there are only aerodynamic forces in the pressure center. 17–19 However, when intensity of the crosswind changes, the pressure center position of a vehicle also changes. Therefore, the pressure center position of a vehicle is not fixed.…”

Section: Experiments Methods and Cfd Simulationmentioning

confidence: 99%

Combined simulation of heavy truck stability under sudden and discontinuous direction change of crosswind with computational fluid dynamics and multi-body system vehicle dynamics software

Zhang

Guo

2018

Advances in Mechanical Engineering

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The method of yaw model is used to establish aerodynamic property of heavy truck in computational fluid dynamics and wind tunnel test. A model of multi-body system simulation for heavy truck is built based on design and measure data from body, driving system, steering system, braking system, and powertrain system with TruckSim. Aerodynamic reference point of Society of Automotive Engineers (SAE) and aerodynamic coefficients are as the interface to integrate computational fluid dynamics and multi-body system simulation. A sudden and discontinuous direction change of crosswind is set up in multi-body system simulation, and dynamic performance of the heavy truck is performed by open-loop and closed-loop simulation. Under the given simulation case, lateral offset of the truck for open-loop simulation is 1.55 m and more than that for closed-loop simulation; the roll rate range of both simulations is 21.49°/s to 1.695°/s, the range of lateral acceleration is 20.497 m/s 2 to 0.447 m/s 2 in open-loop simulation, the range of lateral acceleration is 20.467 m/s 2 to 0.434 m/s 2 in closed-loop simulation; the range of yaw rate is 21.36°/s to 1.284°/s in open-loop simulation, the range of yaw rate is 20.703°/s to 0.815°/s in closed-loop simulation. The results show that combined simulation of the heavy truck stability can be completed by computational fluid dynamics and multi-body system software under sudden and discontinuous direction change of crosswind.

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Investigation of Turbulent Wind Characteristics on Vehicles by Large Eddy Simulation

Liu¹,

Liang²,

Wang³

et al. 2022

SAE Technical Paper Series

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Detached-Eddy Simulations for Steady and Unsteady Crosswind Aerodynamics of Ground Vehicles.

Cited by 3 publications

References 7 publications

Analysis of the Aerodynamic Characteristics of Small-Sized Car Vehicles under the Influence of Steady Crosswind

Analysis of the Aerodynamic Characteristics of Small-Sized Car Vehicles under the Influence of Steady Crosswind

Combined simulation of heavy truck stability under sudden and discontinuous direction change of crosswind with computational fluid dynamics and multi-body system vehicle dynamics software

Investigation of Turbulent Wind Characteristics on Vehicles by Large Eddy Simulation

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