Large eddy simulation based on high-performance computing technique was conducted to investigate the unsteady aerodynamic forces acting on a full-scale heavy duty truck subjected to sudden crosswind. The CFD results were applied to evaluate the effect of the unsteady external forces on a vehicle motion, as a first step toward a more reliable vehicle motion analysis. As the first report, the numerical method was validated on the DNW wind-tunnel data by comparing the time-averaged drag and lateral forces at various yawing angles up to 10 degrees. Then the method was applied to the case when the vehicle goes through the crosswind region. The time series of the aerodynamic forces were acquired and discussed through the visualization of instantaneous flow structures around the vehicle. It was observed that drastic undershooting and overshooting of the yawing moment acts on the vehicle during the rushing in and out process. A simplified model was developed for the long-term motion analysis study to save the computational resources consumed to reproduce the detailed geometry.


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    Title :

    HPC-LES for Unsteady Aerodynamics of a Heavy Duty Truck in Wind Gust - 1st report: Validation and Unsteady Flow Structures


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2010 World Congress & Exhibition ; 2010



    Publication date :

    2010-04-12




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    2010-01-1010 HPC-LES for Unsteady Aerodynamics of a Heavy Duty Truck in Wind Gust - 1st report: Validation and Unsteady Flow Structures

    Tsubokura, M. / Takahashi, K. / Matsuuki, T. et al. | British Library Conference Proceedings | 2010



    HPC-LES for Unsteady Aerodynamics of a Heavy Duty Truck in Wind Gust - 2nd report: Coupled Analysis with Vehicle Motion

    Tsubokura, Makoto / Ikenaga, Takeshi / Nakashima, Takuji et al. | SAE Technical Papers | 2010


    2010-01-1021 HPC-LES for Unsteady Aerodynamics of a Heavy Duty Truck in Wind Gust - 2nd report: Coupled Analysis with Vehicle Motion

    Nakashima, T. / Tsubokura, M. / Ikenaga, T. et al. | British Library Conference Proceedings | 2010