Unstructured Large Eddy Simulation (LES) of flow around vehicles 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 a simplified vehicle. Then, the method is applied to a full-scale production vehicle to 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. 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.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Unstructured large eddy simulation of flows around automobiles using high performance computing technique: A shift from steady to unsteady aerodynamics


    Contributors:
    Tsubokura, M. (author) / Nakashima, T. (author) / Oshima, N. (author) / Kitoh, K. (author) / Zhang, H. (author) / Hori, K. (author) / Kobayashi, T. (author)


    Publication date :

    2008


    Size :

    6 Seiten, 11 Bilder, 3 Tabellen, 10 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Large-Eddy Simulation for vehicle aerodynamics in unsteady crosswind condition

    Nakashima, T. / Tsubokura, M. / Kitoh, K. et al. | British Library Conference Proceedings | 2009


    Large eddy simulation of turbulent flows using unstructured grids

    Simons, Todd / Pletcher, Richard | AIAA | 1998



    Development of an Unsteady Aerodynamic Simulator Using Large-Eddy Simulation Based on High-Performance Computing Technique

    Kitoh, Kozo / Tsubokura, Makoto / Oshima, Nobuyuki et al. | SAE Technical Papers | 2009


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

    Favre, Tristan / Efraimsson, Gunilla / Elofsson, Per | AIAA | 2011