Vehicle Aerodynamic Stability Analysis under High Crosswinds

Grm, Aleksander; Batista, Milan

doi:10.5545/sv-jme.2016.4095

Cited by 7 publications

(2 citation statements)

References 15 publications

(43 reference statements)

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“…However, the commonly used numerical methods in vehicle aerodynamics are mostly based on experience and lack pertinence and relevant computational comparisons, leading to unsatisfactory calculation results. In light of this, Grm and Batista (2016) discussed the influence of the vehicle's body surface mesh size, normal height of the first boundary layer, and number of wall boundary layers on calculation accuracy. Based on Ahmed's model, Ashton and Revell (2015) discussed the influences of grid quality and discretization scheme on computation accuracy using delayed detached Eddy simulation (DDES).…”

Section: Introductionmentioning

confidence: 99%

Research on precise and standardized numerical simulation strategy for vehicle aerodynamics

Chen,

Liu,

et al. 2024

HFF

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Purpose The purpose of this study is to propose a precise and standardized strategy for numerically simulating vehicle aerodynamics. Design/methodology/approach Error sources in computational fluid dynamics were analyzed. Additionally, controllable experiential and discretization errors, which significantly influence the calculated results, are expounded upon. Considering the airflow mechanism around a vehicle, the computational efficiency and accuracy of each solution strategy were compared and analyzed through numerous computational cases. Finally, the most suitable numerical strategy, including the turbulence model, simplified vehicle model, calculation domain, boundary conditions, grids and discretization scheme, was identified. Two simplified vehicle models were introduced, and relevant wind tunnel tests were performed to validate the selected strategy. Findings Errors in vehicle computational aerodynamics mainly stem from the unreasonable simplification of the vehicle model, calculation domain, definite solution conditions, grid strategy and discretization schemes. Using the proposed standardized numerical strategy, the simulated steady and transient aerodynamic characteristics agreed well with the experimental results. Originality/value Building upon the modified Low-Reynolds Number k-e model and Scale Adaptive Simulation model, to the best of the authors’ knowledge, a precise and standardized numerical simulation strategy for vehicle aerodynamics is proposed for the first time, which can be integrated into vehicle research and design.

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Section: Introductionmentioning

confidence: 99%

Research on precise and standardized numerical simulation strategy for vehicle aerodynamics

Chen,

Liu,

et al. 2024

HFF

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“…Among these conditions, high-intensity crosswinds could be listed as one of the most common causes that lead to lane invasion (with the potential of incurring a multi-vehicle accident) and, in the worst cases, to vehicle rollover. This is the reason why a lot of research effort has been made in recent years to investigate this phenomenon by authors like Coleman and Baker [1], Baker et al [2], Cai and Chen [3] and many others [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] considering also different vehicles typologies.…”

Section: Introductionmentioning

confidence: 99%

Heavy-Vehicle Response to Crosswind: Evaluation of Driver Reactions Using a Dynamic Driving Simulator

et al. 2023

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Heavy vehicles exiting (or entering) a tunnel at high speed under a strong crosswind is a particularly critical condition since the aerodynamic load changes drastically, greatly affecting the lateral stability of the vehicle. Often, active control systems (active suspensions, active front steering, etc.) and infrastructure elements (e.g., wind fences) are proposed to reduce the induced risks. To help the design of these devices, the present paper investigates the response of the vehicle–driver system in the case of a high-sided lorry exiting a tunnel under crosswind, by using Driver-In-the-Loop simulations. The study was performed using the dynamic driving simulator of Politecnico di Milano and 28 test drivers. Vehicle and aerodynamic models have been developed to reproduce the phenomenon in a highly immersive environment. During the tests, several combinations of vehicle and wind speed were considered. The effect of vehicle loading condition (Empty and Laden) was also investigated. The performed tests allowed us to gain information about the sequence of the driver’s actions and associated delays, which may induce lane deviation or, in the worst case, rollover. It was found that lane invasion may happen for ratios of lateral aerodynamic force over vehicle weight force bigger than 0.1, while rollover could happen for ratios bigger than 0.3. Moreover, it was found that the driver’s response typically happens with a delay of ∼0.25 s with respect to the onset of the crosswind stimulus.

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Flow analysis of rear end body shape of the vehicle for better aerodynamic performance

Sivaraj¹,

Parammasivam

Prasath³

et al. 2021

Materials Today: Proceedings

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Vehicle Aerodynamic Stability Analysis under High Crosswinds

Cited by 7 publications

References 15 publications

Research on precise and standardized numerical simulation strategy for vehicle aerodynamics

Research on precise and standardized numerical simulation strategy for vehicle aerodynamics

Heavy-Vehicle Response to Crosswind: Evaluation of Driver Reactions Using a Dynamic Driving Simulator

Flow analysis of rear end body shape of the vehicle for better aerodynamic performance

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