On the Influence of the Near Wall Formulation of Turbulence Models for Prediction of Aerodynamic Coefficients for Ground Vehicles

Borg, Andreas; Perzon, Sven; Roditcheva, Olga

doi:10.4271/2003-01-1317

Cited by 2 publications

(2 citation statements)

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“…The sinusoidal velocity shape of 33.3 m/s is specified at the inlet to mimic the road conditions, the pressure outlet and the moving ground are specified as other boundary conditions. Transient calculation with a time step of 0.025 s is used to simulate the vehicle moving on the sinusoidal road and the steady-state simulation analysis is used to simulate the wind tunnel test for vehicle driving on the no-grad or flat road conditions (Jones and Clark, 2005;McCutcheon et al, 2002;Borg et al, 2003).…”

Section: Cfd Simulations 31 Model Establishmentmentioning

confidence: 99%

“…Therefore, it is concluded that testing of vehicle Cd on the real road can be replaced by the much simplified steady-state simulation process inside wind tunnel (baseline). The benefits of using simulated wind tunnel testing is that steady-state solution process can drastically shorten the calculation time and the effects from road grade conditions can be ignored for development purpose (Borg et al, 2003;Timo et al, 2009;Landström et al, 2010;Huminic and Huminic, 2009;Zielinski and Eccles, 2008;Wissenschaftliche, 1911). Through simulation analysis, the flow field around the vehicle can be obtained.…”

Section: Aerodynamic Simulation Analysismentioning

confidence: 99%

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Vehicle aerodynamic simulation analysis and research on bumpy road

Zheng

2020

HFF

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Purpose In order to certify the testing of vehicle Cd on the real road can be replaced by the much simplified steady-state simulation process inside wind tunnel. Design/methodology/approach The paper opted innovative methods to verify the feasibility of using aerodynamic wind tunnel test for vehicle development purpose, including establishing the typical sinusoidal mapping function for road shapes during vehicle driving process to simplify the complexity of the road and choosing three different kinds of road spectrum amplitudes to establish the vehicle motion model, which can accurately predict the vehicle motion characteristics in the road driving process. The new approach simulates the vehicle aerodynamics on the road by taking into account the pitch angle changes during vehicle motion. Findings By comparing the transient drag coefficient on road with the steady-state simulated value in the conventional aerodynamic wind tunnel. This paper provides empirical insights about the flow field analysis around the vehicle on road that can verify the feasibility of using aerodynamic wind tunnel test for vehicle development purpose. Research limitations/implications Because of establishing the typical sinusoidal mapping function for road shapes, the study results may lack generalizability. Therefore, researchers are encouraged to test the proposed propositions further. Practical implications This paper includes implications for the flow field analysis around the vehicle on road that can verify the feasibility of using aerodynamic wind tunnel test for vehicle development purpose. Originality/value This paper fulfills an identified need to use aerodynamic wind tunnel test for vehicle development purpose.

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Section: Cfd Simulations 31 Model Establishmentmentioning

confidence: 99%