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Computational visualization of unsteady flow around vehicles using high performance computing

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Title: Computational visualization of unsteady flow around vehicles using high performance computing
Authors: Tsubokura, Makoto Browse this author →KAKEN DB
Kobayashi, Toshio Browse this author
Nakashima, Takuji Browse this author
Nouzawa, Takahide Browse this author
Nakamura, Takaki Browse this author
Zhang, Huilai Browse this author
Onishi, Keiji Browse this author
Oshima, Nobuyuki Browse this author
Keywords: Computational Fluid Dynamics (CFD)
High Performance Computing (HPC)
Vehicle Aerodynamics
Turbulent Flow
Eddy Structures
Large Eddy Simulation (LES)
Issue Date: May-2009
Publisher: Elsevier
Journal Title: Computers & Fluids
Volume: 38
Issue: 5
Start Page: 981
End Page: 990
Publisher DOI: 10.1016/j.compfluid.2008.01.020
Abstract: One of the largest-scale unstructured Large Eddy Simulation (LES) of flow around a full-scale road vehicle is conducted on the Earth Simulator in Japan. The main objective of our study is to look into the validity of LES for the assessment of vehicle aerodynamics, especially in the context of its possibility for unsteady or transient aerodynamic forces. Firstly, the aerodynamic LES proposed is quantitatively validated on the ASMO simplified model by comparing the mean pressure distributions on the vehicle surface with those obtained by a conventional Reynolds-Averaged Navier-Stokes simulation (RANS) or a wind tunnel measurement. Then, the method is applied to the full-scale vehicle with complicated geometry to qualitatively investigate the capability of capturing organized flow structures around the vehicle. Finally, unsteady aerodynamic forces acting on the vehicle in transient yawing-angle change are estimated and relationship between the flow structures and the transient aerodynamic forces is mentioned. As a result, it is demonstrated that LES will be a powerful tool for the vehicle aerodynamic assessment in the foreseeable future, because it can provide precious aerodynamic data which conventional wind tunnel tests or RANS simulations are difficult to provide.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 坪倉 誠

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