Steady-state Reynolds averaged Navier-Stokes (RANS) simulations are presented for the three-dimensional flow over a generic tractor trailer placed in the Auburn University 3 X 4 ft2 suction wind tunnel. The width of the truck geometry is 10 in., and the height and length of the trailer are 1.392 and 3.4 times the width, respectively. The computational model of the wind tunnel is validated by comparing the numerical results with the data from the empty wind tunnel experiments. The comparisons include the boundary layer properties at three different locations on the floor of the test section and the flow angularity at the beginning of the test section. Three grid levels are usedfor the simulation of the truck geometry placed in the test section of the wind tunnel. The coarse mesh consists of 3.4 X 105 cells, the medium mesh consists of 11.2 X 10 6 cells and the fine mesh consists of 25.8 X 106 cells. The turbulence models usedfor both the empty tunnel simulations and the truck geometry placed in the wind tunnel are the standard Wilcox 1998 k-omega model, the SST k-omega model, the standard k-epsilon model, and the Spalart-Allmaras model. The surface pressure distributions on the truck geometry and the overall drag are predictedfrom the simulations and compared with the experimental data. The computational predictions compared well with the experimental data. This study contributes a new validation data set and computations for high Reynolds number bluff-body flows. The validation data set can be used for initial assessment in evaluating RANS models, which will be used for studying the drag or drag trends predicted by the baseline truck geometries.


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    Title :

    Joint computational/experimental aerodynamic study of a simplified tractor/trailer geometry


    Additional title:

    Kombinierte numerische und experimentelle Studie zu einer vereinfachten Zugmaschinen/Anhänger-Geometrie




    Publication date :

    2009


    Size :

    9 Seiten, 15 Bilder, 4 Tabellen, 21 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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