Recently, unsteady aerodynamics has been drawing many attention because it is becoming clear that unsteady aerodynamics have a big effect on running stability, safety and ride comfort of vehicles. In order to estimate unsteady aerodynamics, it is necessary to reproduce the actual running condition including an atmospheric disturbance and vehicle motion. However, it is difficult to investigate the effect of unsteady aerodynamics in the road test because it has a lot of errors in measurement. In this study, a coupled simulation method between the 6DoF motion of a vehicle and aerodynamics was developed for these problems. Large Eddy Simulation (LES) was used to estimate the aerodynamics, and the motion equations of a vehicle was used to estimate vehicle motion. Vehicle motion in aerodynamic simulation was reproduced by using Arbitrary Lagrangian-Eulerian (ALE) method. In addition, sliding mesh method was used to reproduce overtaking and passing motions of two vehicles. By using the methods, aerodynamics and vehicle dynamics simulations are treated interactively (2-way) by exchanging each result at each time step. The 2-way results were compared with the 1-way coupled simulation estimating vehicle motion from aerodynamics results posteriori to investigate how vehicle’s motion itself further affects its aerodynamics during the pass-by and overtaking motions. Our main focus is, by using this method, to study the effect of unsteady aerodynamics on the running stability of a vehicle. The results of 1-way and 2-way coupling analysis showed difference with respect to behavior of a vehicle. It is believed that such differences result in the different aerodynamic forces and moments, which is caused by the vehicle’s posture changes in the 2-way coupling simulation.
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ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
July 26–31, 2015
Seoul, South Korea
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5732-8
PROCEEDINGS PAPER
Coupled 6DoF Motion and Aerodynamics Simulation During Pass-By and Overtaken Motions
Hirotaka Ishioka,
Hirotaka Ishioka
Hokkaido University, Sapporo, Japan
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Kosuke Nakasato,
Kosuke Nakasato
NISSAN MOTOR CO., LTD, Atsugi-shi, Japan
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Keiji Onishi,
Keiji Onishi
RIKEN Advanced Institute for Computational Science, Kobe, Japan
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Makoto Tsubokura
Makoto Tsubokura
Hokkaido University, Sapporo, Japan
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Hirotaka Ishioka
Hokkaido University, Sapporo, Japan
Shoya Ota
Hokkaido University, Sapporo, Japan
Kosuke Nakasato
NISSAN MOTOR CO., LTD, Atsugi-shi, Japan
Keiji Onishi
RIKEN Advanced Institute for Computational Science, Kobe, Japan
Makoto Tsubokura
Hokkaido University, Sapporo, Japan
Paper No:
AJKFluids2015-17714, V01AT17A003; 7 pages
Published Online:
April 4, 2016
Citation
Ishioka, H, Ota, S, Nakasato, K, Onishi, K, & Tsubokura, M. "Coupled 6DoF Motion and Aerodynamics Simulation During Pass-By and Overtaken Motions." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 1A: Symposia, Part 2. Seoul, South Korea. July 26–31, 2015. V01AT17A003. ASME. https://doi.org/10.1115/AJKFluids2015-17714
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